📖 Tier 1: Prepare & Study Guide
✓ 100% Solved with Rationales
Assistant Professor (Botany) Complete Preparation Guide & Solved Questions (2026) - Apex Rankers
SPSC Recruitment Examination Syllabus & Question Bank
4427 Total
Questions
~6641 mins Read
Time
4 Subject Areas
Q. 1
MULTIPLE_CHOICE
Difficulty: EASY
(1 Mark)
The primary carbon-fixing enzyme in C3 photosynthetic Calvin cycle is:
A
ATP synthase
B
PEP carboxylase
C
Amylase
D
RuBisCO (Ribulose-1,5-bisphosphate carboxylase-oxygenase)
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
RuBisCO fixes atmospheric CO2 onto RuBP to yield two molecules of 3-PGA.
Q. 2
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
In C4 plants (e.g. Maize, Sugarcane), initial CO2 fixation occurs in mesophyll cells catalyzed by:
A
Hexokinase
B
RuBisCO
C
PEP Carboxylase (yielding Oxaloacetate)
✓ Correct
D
Carbonic anhydrase
💡
Step-by-Step Explanation & Concept Rationale
PEP carboxylase lacks oxygenase activity, preventing wasteful photorespiration.
Q. 3
MULTIPLE_CHOICE
Difficulty: EASY
(1 Mark)
Which plant hormone is primarily responsible for apical dominance and phototropism?
A
Cytokinin
B
Auxin (Indole-3-acetic acid, IAA)
✓ Correct
C
Gibberellin
D
Abscisic acid
💡
Step-by-Step Explanation & Concept Rationale
Polar basipetal auxin transport from the apical shoot tip inhibits axillary lateral buds.
Q. 4
MULTIPLE_CHOICE
Difficulty: EASY
(1 Mark)
The stress hormone responsible for stomatal closure during drought is:
A
Ethylene
B
Auxin
C
Gibberellin
D
Abscisic Acid (ABA)
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
ABA triggers rapid efflux of potassium and anions from guard cells, causing loss of turgor.
Q. 5
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
Water moves upward in tall trees primarily driven by the mechanism of:
A
Transpiration Pull and Cohesion-Tension Theory
✓ Correct
B
Active root pumping
C
Capillarity alone
D
Atmospheric pressure only
💡
Step-by-Step Explanation & Concept Rationale
Dixon and Joly's cohesion theory explains continuous water column pull under negative tension.
Q. 6
MULTIPLE_CHOICE
Difficulty: EASY
(1 Mark)
In professional practice: The primary carbon-fixing enzyme in C3 photosynthetic Calvin cycle is:
A
RuBisCO (Ribulose-1,5-bisphosphate carboxylase-oxygenase)
✓ Correct
B
Amylase
C
ATP synthase
D
PEP carboxylase
💡
Step-by-Step Explanation & Concept Rationale
RuBisCO fixes atmospheric CO2 onto RuBP to yield two molecules of 3-PGA.
Q. 7
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
In professional practice: In C4 plants (e.g. Maize, Sugarcane), initial CO2 fixation occurs in mesophyll cells catalyzed by:
A
Hexokinase
B
Carbonic anhydrase
C
RuBisCO
D
PEP Carboxylase (yielding Oxaloacetate)
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
PEP carboxylase lacks oxygenase activity, preventing wasteful photorespiration.
Q. 8
MULTIPLE_CHOICE
Difficulty: EASY
(1 Mark)
In professional practice: Which plant hormone is primarily responsible for apical dominance and phototropism?
A
Gibberellin
B
Cytokinin
C
Abscisic acid
D
Auxin (Indole-3-acetic acid, IAA)
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Polar basipetal auxin transport from the apical shoot tip inhibits axillary lateral buds.
Q. 9
MULTIPLE_CHOICE
Difficulty: EASY
(1 Mark)
In professional practice: The stress hormone responsible for stomatal closure during drought is:
A
Abscisic Acid (ABA)
✓ Correct
B
Gibberellin
C
Ethylene
D
Auxin
💡
Step-by-Step Explanation & Concept Rationale
ABA triggers rapid efflux of potassium and anions from guard cells, causing loss of turgor.
Q. 10
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
In professional practice: Water moves upward in tall trees primarily driven by the mechanism of:
A
Active root pumping
B
Transpiration Pull and Cohesion-Tension Theory
✓ Correct
C
Capillarity alone
D
Atmospheric pressure only
💡
Step-by-Step Explanation & Concept Rationale
Dixon and Joly's cohesion theory explains continuous water column pull under negative tension.
Q. 11
MULTIPLE_CHOICE
Difficulty: EASY
(1 Mark)
According to standard examination standards: The primary carbon-fixing enzyme in C3 photosynthetic Calvin cycle is:
A
Amylase
B
ATP synthase
C
RuBisCO (Ribulose-1,5-bisphosphate carboxylase-oxygenase)
✓ Correct
D
PEP carboxylase
💡
Step-by-Step Explanation & Concept Rationale
RuBisCO fixes atmospheric CO2 onto RuBP to yield two molecules of 3-PGA.
Q. 12
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
According to standard examination standards: In C4 plants (e.g. Maize, Sugarcane), initial CO2 fixation occurs in mesophyll cells catalyzed by:
A
Hexokinase
B
Carbonic anhydrase
C
PEP Carboxylase (yielding Oxaloacetate)
✓ Correct
D
RuBisCO
💡
Step-by-Step Explanation & Concept Rationale
PEP carboxylase lacks oxygenase activity, preventing wasteful photorespiration.
Q. 13
MULTIPLE_CHOICE
Difficulty: EASY
(1 Mark)
According to standard examination standards: Which plant hormone is primarily responsible for apical dominance and phototropism?
A
Gibberellin
B
Auxin (Indole-3-acetic acid, IAA)
✓ Correct
C
Abscisic acid
D
Cytokinin
💡
Step-by-Step Explanation & Concept Rationale
Polar basipetal auxin transport from the apical shoot tip inhibits axillary lateral buds.
Q. 14
MULTIPLE_CHOICE
Difficulty: EASY
(1 Mark)
According to standard examination standards: The stress hormone responsible for stomatal closure during drought is:
A
Auxin
B
Abscisic Acid (ABA)
✓ Correct
C
Ethylene
D
Gibberellin
💡
Step-by-Step Explanation & Concept Rationale
ABA triggers rapid efflux of potassium and anions from guard cells, causing loss of turgor.
Q. 15
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
According to standard examination standards: Water moves upward in tall trees primarily driven by the mechanism of:
A
Atmospheric pressure only
B
Capillarity alone
C
Transpiration Pull and Cohesion-Tension Theory
✓ Correct
D
Active root pumping
💡
Step-by-Step Explanation & Concept Rationale
Dixon and Joly's cohesion theory explains continuous water column pull under negative tension.
Q. 16
MULTIPLE_CHOICE
Difficulty: EASY
(1 Mark)
From an applied perspective: The primary carbon-fixing enzyme in C3 photosynthetic Calvin cycle is:
A
Amylase
B
PEP carboxylase
C
RuBisCO (Ribulose-1,5-bisphosphate carboxylase-oxygenase)
✓ Correct
D
ATP synthase
💡
Step-by-Step Explanation & Concept Rationale
RuBisCO fixes atmospheric CO2 onto RuBP to yield two molecules of 3-PGA.
Q. 17
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
From an applied perspective: In C4 plants (e.g. Maize, Sugarcane), initial CO2 fixation occurs in mesophyll cells catalyzed by:
A
RuBisCO
B
Carbonic anhydrase
C
PEP Carboxylase (yielding Oxaloacetate)
✓ Correct
D
Hexokinase
💡
Step-by-Step Explanation & Concept Rationale
PEP carboxylase lacks oxygenase activity, preventing wasteful photorespiration.
Q. 18
MULTIPLE_CHOICE
Difficulty: EASY
(1 Mark)
From an applied perspective: Which plant hormone is primarily responsible for apical dominance and phototropism?
A
Auxin (Indole-3-acetic acid, IAA)
✓ Correct
B
Cytokinin
C
Gibberellin
D
Abscisic acid
💡
Step-by-Step Explanation & Concept Rationale
Polar basipetal auxin transport from the apical shoot tip inhibits axillary lateral buds.
Q. 19
MULTIPLE_CHOICE
Difficulty: EASY
(1 Mark)
From an applied perspective: The stress hormone responsible for stomatal closure during drought is:
A
Auxin
B
Gibberellin
C
Abscisic Acid (ABA)
✓ Correct
D
Ethylene
💡
Step-by-Step Explanation & Concept Rationale
ABA triggers rapid efflux of potassium and anions from guard cells, causing loss of turgor.
Q. 20
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
From an applied perspective: Water moves upward in tall trees primarily driven by the mechanism of:
A
Active root pumping
B
Atmospheric pressure only
C
Capillarity alone
D
Transpiration Pull and Cohesion-Tension Theory
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Dixon and Joly's cohesion theory explains continuous water column pull under negative tension.
Q. 21
MULTIPLE_CHOICE
Difficulty: EASY
(1 Mark)
Under standard operational protocols: The primary carbon-fixing enzyme in C3 photosynthetic Calvin cycle is:
A
PEP carboxylase
B
Amylase
C
RuBisCO (Ribulose-1,5-bisphosphate carboxylase-oxygenase)
✓ Correct
D
ATP synthase
💡
Step-by-Step Explanation & Concept Rationale
RuBisCO fixes atmospheric CO2 onto RuBP to yield two molecules of 3-PGA.
Q. 22
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
Under standard operational protocols: In C4 plants (e.g. Maize, Sugarcane), initial CO2 fixation occurs in mesophyll cells catalyzed by:
A
Hexokinase
B
Carbonic anhydrase
C
RuBisCO
D
PEP Carboxylase (yielding Oxaloacetate)
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
PEP carboxylase lacks oxygenase activity, preventing wasteful photorespiration.
Q. 23
MULTIPLE_CHOICE
Difficulty: EASY
(1 Mark)
Under standard operational protocols: Which plant hormone is primarily responsible for apical dominance and phototropism?
A
Auxin (Indole-3-acetic acid, IAA)
✓ Correct
B
Gibberellin
C
Abscisic acid
D
Cytokinin
💡
Step-by-Step Explanation & Concept Rationale
Polar basipetal auxin transport from the apical shoot tip inhibits axillary lateral buds.
Q. 24
MULTIPLE_CHOICE
Difficulty: EASY
(1 Mark)
Under standard operational protocols: The stress hormone responsible for stomatal closure during drought is:
A
Gibberellin
B
Ethylene
C
Auxin
D
Abscisic Acid (ABA)
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
ABA triggers rapid efflux of potassium and anions from guard cells, causing loss of turgor.
Q. 25
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
Under standard operational protocols: Water moves upward in tall trees primarily driven by the mechanism of:
A
Transpiration Pull and Cohesion-Tension Theory
✓ Correct
B
Active root pumping
C
Capillarity alone
D
Atmospheric pressure only
💡
Step-by-Step Explanation & Concept Rationale
Dixon and Joly's cohesion theory explains continuous water column pull under negative tension.
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Q. 1
Biology & Medical Sciences
Difficulty: EASY
(1 Mark)
Which cellular organelle is known as the 'Powerhouse of the Cell' where ATP is synthesized via oxidative phosphorylation?
A
Mitochondria
✓ Correct
B
Ribosome
C
Endoplasmic Reticulum
D
Golgi Apparatus
💡
Step-by-Step Explanation & Concept Rationale
Mitochondria generate the vast majority of cellular chemical energy in the form of ATP via the Krebs cycle and electron transport chain.
Q. 2
Biology & Medical Sciences
Difficulty: EASY
(1 Mark)
What is the primary structural component of plant cell walls?
A
Cellulose (beta-1,4-D-glucan polymer)
✓ Correct
B
Chitin
C
Peptidoglycan
D
Glycogen
💡
Step-by-Step Explanation & Concept Rationale
Plant cell walls are composed of unbranched cellulose microfibrils embedded in a pectin and hemicellulose matrix.
Q. 3
Biology & Medical Sciences
Difficulty: EASY
(1 Mark)
What type of cell wall polymer is found in the cell walls of Fungi?
A
Chitin (poly-N-acetylglucosamine)
✓ Correct
B
Cellulose
C
Peptidoglycan
D
Lignin
💡
Step-by-Step Explanation & Concept Rationale
Fungal cell walls are reinforced with chitin, which is also found in arthropod exoskeletons.
Q. 4
Biology & Medical Sciences
Difficulty: MEDIUM
(1 Mark)
Which organelle is responsible for post-translational modification, packaging, and sorting of proteins for secretion?
A
Golgi Apparatus (Dictyosome in plants)
✓ Correct
B
Lysosome
C
Peroxisome
D
Centrosome
💡
Step-by-Step Explanation & Concept Rationale
The Golgi apparatus receives proteins from the rough ER, glycosylates them, and sorts them into transport vesicles.
Q. 5
Biology & Medical Sciences
Difficulty: MEDIUM
(1 Mark)
During which phase of Meiosis does 'Crossing Over' (genetic recombination) occur between non-sister chromatids?
A
Pachytene stage of Prophase I
✓ Correct
B
Leptotene of Prophase I
C
Metaphase II
D
Anaphase I
💡
Step-by-Step Explanation & Concept Rationale
Crossing over occurs at the pachytene stage of Prophase I, facilitated by the synaptonemal complex, producing genetic diversity.
Q. 6
Biology & Medical Sciences
Difficulty: EASY
(1 Mark)
According to Watson and Crick's model, what type of chemical bonds hold complementary nitrogenous base pairs together in a DNA double helix?
A
Hydrogen Bonds (2 between A-T, 3 between G-C)
✓ Correct
B
Phosphodiester covalent bonds
C
Peptide bonds
D
Disulfide bridges
💡
Step-by-Step Explanation & Concept Rationale
Adenine pairs with Thymine via 2 hydrogen bonds; Guanine pairs with Cytosine via 3 hydrogen bonds.
Q. 7
Biology & Medical Sciences
Difficulty: MEDIUM
(1 Mark)
What enzyme is primarily responsible for synthesizing messenger RNA (mRNA) from a DNA template during transcription in eukaryotes?
A
RNA Polymerase II
✓ Correct
B
DNA Polymerase III
C
DNA Ligase
D
Reverse Transcriptase
💡
Step-by-Step Explanation & Concept Rationale
RNA Polymerase II transcribes all protein-coding genes into pre-mRNA in eukaryotic nuclei.
Q. 8
Biology & Medical Sciences
Difficulty: EASY
(1 Mark)
What is the universal start codon in mRNA that codes for Methionine in translation?
A
AUG
✓ Correct
B
UAA
C
UAG
D
UGA
💡
Step-by-Step Explanation & Concept Rationale
AUG is the universal initiator codon specifying Methionine (formyl-methionine in prokaryotes). UAA, UAG, and UGA are stop codons.
Q. 9
Biology & Medical Sciences
Difficulty: EASY
(1 Mark)
What is the phenotypic Mendelian ratio in the F2 generation of a classic monohybrid cross with complete dominance?
A
3 : 1 (3 Dominant : 1 Recessive)
✓ Correct
B
9 : 3 : 3 : 1
C
1 : 2 : 1
D
1 : 1
💡
Step-by-Step Explanation & Concept Rationale
A monohybrid cross between heterozygotes (Aa x Aa) yields 3 dominant to 1 recessive phenotype (1 AA : 2 Aa : 1 aa genotype).
Q. 10
Biology & Medical Sciences
Difficulty: EASY
(1 Mark)
Which blood vessels carry oxygenated blood from the lungs back to the left atrium of the human heart?
A
Pulmonary Veins
✓ Correct
B
Pulmonary Arteries
C
Superior Vena Cava
D
Coronary Arteries
💡
Step-by-Step Explanation & Concept Rationale
Pulmonary veins are the only veins in adults carrying oxygen-rich blood, delivering it from pulmonary capillaries to the left atrium.
Q. 11
Biology & Medical Sciences
Difficulty: EASY
(1 Mark)
What is the functional, microscopic filtration and reabsorption unit of the human kidney?
A
Nephron
✓ Correct
B
Neuron
C
Alveolus
D
Hepatic lobule
💡
Step-by-Step Explanation & Concept Rationale
Each human kidney contains approximately 1 million nephrons composed of glomeruli, Bowman's capsules, and renal tubules.
Q. 12
Biology & Medical Sciences
Difficulty: EASY
(1 Mark)
Which hormone secreted by the Beta cells of the Islets of Langerhans lowers blood glucose levels by promoting cellular glucose uptake?
A
Insulin
✓ Correct
B
Glucagon
C
Cortisol
D
Thyroxine (T4)
💡
Step-by-Step Explanation & Concept Rationale
Insulin facilitates cellular uptake and glycogen synthesis, lowering plasma glucose concentrations.
Q. 13
Biology & Medical Sciences
Difficulty: MEDIUM
(1 Mark)
Which neurotransmitter is released at the neuromuscular junction to trigger skeletal muscle contraction?
A
Acetylcholine (ACh)
✓ Correct
B
Dopamine
C
Serotonin
D
GABA
💡
Step-by-Step Explanation & Concept Rationale
Motor neurons release acetylcholine into the synaptic cleft, binding to nicotinic receptors and causing muscle depolarization.
Q. 14
Biology & Medical Sciences
Difficulty: MEDIUM
(1 Mark)
Which region of the human brain acts as the primary autonomic control center for heartbeat, respiration, and vasomotor tone?
A
Medulla Oblongata
✓ Correct
B
Cerebellum
C
Cerebrum
D
Thalamus
💡
Step-by-Step Explanation & Concept Rationale
The medulla oblongata in the brainstem houses the cardiac, respiratory, and vasomotor centers regulating vital life functions.
Q. 15
Biology & Medical Sciences
Difficulty: EASY
(1 Mark)
Where do the Light-Dependent reactions of photosynthesis occur within the chloroplast?
A
Thylakoid membranes (Grana)
✓ Correct
B
Stroma
C
Outer membrane
D
Intermembrane space
💡
Step-by-Step Explanation & Concept Rationale
Light reactions take place in the thylakoid membranes where chlorophyll absorbs light, producing ATP and NADPH (the Calvin cycle occurs in the stroma).
Q. 16
Biology & Medical Sciences
Difficulty: EASY
(1 Mark)
What plant vascular tissue is responsible for transporting water and dissolved inorganic minerals upward from roots to leaves?
A
Xylem (vessels and tracheids)
✓ Correct
B
Phloem (sieve tubes and companion cells)
C
Pith
D
Cortex
💡
Step-by-Step Explanation & Concept Rationale
Xylem conducts water unidirectionally via transpiration pull and root pressure; Phloem translocates sucrose bidirectionally.
Q. 17
Biology & Medical Sciences
Difficulty: MEDIUM
(1 Mark)
Which plant hormone is primarily responsible for promoting cell elongation, apical dominance, and phototropism?
A
Auxin (Indole-3-acetic acid / IAA)
✓ Correct
B
Gibberellin
C
Cytokinin
D
Abscisic Acid (ABA)
💡
Step-by-Step Explanation & Concept Rationale
Auxins stimulate cell wall loosening and shoot elongation toward light (phototropism) and suppress lateral buds.
Q. 18
Biology & Medical Sciences
Difficulty: MEDIUM
(1 Mark)
Which plant hormone is known as the 'Stress Hormone' that induces stomatal closure during drought?
A
Abscisic Acid (ABA)
✓ Correct
B
Ethylene
C
Auxin
D
Gibberellic acid (GA3)
💡
Step-by-Step Explanation & Concept Rationale
ABA signals guard cells to lose turgor pressure and close stomata rapidly to prevent fatal desiccation under water stress.
Q. 19
Biology & Medical Sciences
Difficulty: MEDIUM
(1 Mark)
Which class of immunoglobulins (antibodies) is the most abundant in human blood serum and can cross the placenta to confer passive immunity to the fetus?
A
IgG
✓ Correct
B
IgM
C
IgA
D
IgE
💡
Step-by-Step Explanation & Concept Rationale
IgG constitutes ~75–80% of total serum antibodies and is the sole isotype transported across the human placental barrier.
Q. 20
Biology & Medical Sciences
Difficulty: MEDIUM
(1 Mark)
Which antibody class is predominantly found in mucosal secretions (saliva, tears, breast milk, gastrointestinal fluid)?
A
Secretory IgA
✓ Correct
B
IgG
C
IgD
D
IgE
💡
Step-by-Step Explanation & Concept Rationale
IgA provides primary mucosal surface defense against bacterial and viral invasion.
Q. 21
Biology & Medical Sciences
Difficulty: EASY
(1 Mark)
What term describes a symbiotic ecological relationship where both participating species derive mutual benefit?
A
Mutualism (e.g., mycorrhizae, lichens, pollinators)
✓ Correct
B
Commensalism
C
Parasitism
D
Amensalism
💡
Step-by-Step Explanation & Concept Rationale
Mutualism is an obligate or facultative interaction where both organisms experience fitness gains (+/+).
Q. 22
Biology & Medical Sciences
Difficulty: EASY
(1 Mark)
According to Lindeman's 10% Ecological Law, what percentage of energy is typically transferred from one trophic level to the next higher level in a food chain?
A
Approximately 10%
✓ Correct
B
50%
C
100%
D
1%
💡
Step-by-Step Explanation & Concept Rationale
Around 90% of energy is lost as metabolic heat and waste at each trophic step, transferring only ~10% to the next level.
Q. 23
Biology & Medical Sciences
Difficulty: EASY
(1 Mark)
What is the primary function of Hemoglobin in human red blood cells (erythrocytes)?
A
Reversible transport of molecular Oxygen (O2) via four iron-containing heme prosthetic groups
✓ Correct
B
Synthesis of plasma clotting factors
C
Phagocytosis of invading bacterial pathogens
D
Production of circulating antibodies
💡
Step-by-Step Explanation & Concept Rationale
Hemoglobin is a tetrameric allosteric protein binding up to 4 O2 molecules for systemic respiratory delivery.
Q. 24
Biology & Medical Sciences
Difficulty: EASY
(1 Mark)
Which blood group is universally termed the 'Universal Donor' for red blood cell transfusions?
A
O Negative (O-)
✓ Correct
B
AB Positive (AB+)
C
A Positive
D
B Negative
💡
Step-by-Step Explanation & Concept Rationale
O Negative erythrocytes lack A, B, and Rh (D) antigens, minimizing risk of hemolytic transfusion reactions in recipients.
Q. 25
Biology & Medical Sciences
Difficulty: EASY
(1 Mark)
Which blood group is universally known as the 'Universal Recipient' for plasma and whole blood?
A
AB Positive (AB+)
✓ Correct
B
O Negative
C
A Negative
D
B Positive
💡
Step-by-Step Explanation & Concept Rationale
AB Positive individuals have A, B, and Rh antigens on their cells and lack anti-A, anti-B, and anti-Rh antibodies.
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Q. 1
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
What is the optimum temperature range for wheat germination in Pakistan?
A
35°C to 40°C
B
25°C to 30°C
C
15°C to 20°C
✓ Correct
D
5°C to 10°C
💡
Step-by-Step Explanation & Concept Rationale
15-20°C provides optimal thermal units for rapid embryo activation and root development.
Q. 2
MULTIPLE_CHOICE
Difficulty: EASY
(1 Mark)
Which growth stage in wheat is most vulnerable to water stress?
A
Booting
B
Dough stage
C
Crown Root Initiation (CRI)
✓ Correct
D
Tillering
💡
Step-by-Step Explanation & Concept Rationale
CRI occurring 20-25 days after sowing is critical for establishing nodal roots.
Q. 3
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
What is the recommended seed rate for broadcast sowing of wheat under late planting conditions?
A
90-100 kg/acre
B
20-25 kg/acre
C
60-70 kg/acre (150-175 kg/ha)
✓ Correct
D
35-40 kg/acre
💡
Step-by-Step Explanation & Concept Rationale
Higher seed rate compensates for reduced tillering window in late sown wheat.
Q. 4
MULTIPLE_CHOICE
Difficulty: EASY
(1 Mark)
Which cropping pattern involves growing two or more crops simultaneously with no distinct row arrangement?
A
Relay cropping
B
Intercropping
C
Mixed cropping
✓ Correct
D
Alley cropping
💡
Step-by-Step Explanation & Concept Rationale
Mixed cropping minimizes risk of total crop loss under variable weather.
Q. 5
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
Puddling in paddy rice soil primarily aims to:
A
Promote aerobic nitrification
B
Increase soil porosity
C
Destroy soil aggregates and minimize water percolation
✓ Correct
D
Dry out the topsoil
💡
Step-by-Step Explanation & Concept Rationale
Puddling creates an impervious clay layer that retains standing water in paddy fields.
Q. 6
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
The base temperature (Tb) below which maize growth ceases is:
A
10°C
✓ Correct
B
5°C
C
15°C
D
0°C
💡
Step-by-Step Explanation & Concept Rationale
Maize thermal time (GDD) calculations use 10°C as the physiological base threshold.
Q. 7
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
Which selective post-emergence herbicide controls broadleaf weeds in wheat?
A
Paraquat
B
Glyphosate
C
Bromoxynil + MCPA
✓ Correct
D
Pendimethalin
💡
Step-by-Step Explanation & Concept Rationale
Bromoxynil + MCPA selectively targets dicot weeds without harming monocot wheat.
Q. 8
MULTIPLE_CHOICE
Difficulty: EASY
(1 Mark)
In cotton agronomy, a 'Square' refers to:
A
The unopened floral bud
✓ Correct
B
The secondary root branch
C
The cotyledon leaf
D
The open boll
💡
Step-by-Step Explanation & Concept Rationale
Squares develop into flowers and subsequently into cotton bolls.
Q. 9
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
Which legume crop is widely utilized as a green manure crop before rice?
A
Chickpea
B
Lentil
C
Groundnut
D
Sesbania aculeata (Dhaincha)
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Sesbania produces rapid succulent biomass and fixes high atmospheric nitrogen.
Q. 10
MULTIPLE_CHOICE
Difficulty: HARD
(1 Mark)
The critical weed competition period in maize crop is:
A
During grain filling
B
At physiological maturity
C
Only during germination
D
First 3 to 6 weeks after emergence
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Early weed competition causes severe irreversible yield reduction in maize.
Q. 11
MULTIPLE_CHOICE
Difficulty: HARD
(1 Mark)
System of Rice Intensification (SRI) promotes:
A
Broadcasting mature seedlings densely
B
High chemical fertilizer rates only
C
Transplanting single young seedlings at wider spacing
✓ Correct
D
Flooding fields permanently 6 inches deep
💡
Step-by-Step Explanation & Concept Rationale
SRI uses single young seedlings (8-12 days) at wider square spacing to boost tillering.
Q. 12
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
What is the primary objective of scarification in seed technology?
A
Weakening or breaking an impermeable seed coat to allow water imbibition
✓ Correct
B
Treating seeds with herbicide
C
Drying seeds to zero moisture
D
Freezing seeds
💡
Step-by-Step Explanation & Concept Rationale
Mechanical or chemical scarification breaks physical dormancy in hard-coated seeds.
Q. 13
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
Which sugarcane planting method saves water and facilitates intercropping?
A
Zero tillage
B
Flat broadcast sowing
C
Trench / Pit planting system
✓ Correct
D
Ridge and furrow
💡
Step-by-Step Explanation & Concept Rationale
Deep trenches concentrate irrigation and fertilizers directly around setts.
Q. 14
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
Harvest index (HI) is mathematically defined as:
A
Grain weight per square meter
B
Biological yield divided by grain yield
C
Economic yield divided by total biological yield
✓ Correct
D
Total root mass divided by shoot mass
💡
Step-by-Step Explanation & Concept Rationale
HI = (Economic Yield / Biological Yield) x 100, reflecting partitioning efficiency.
Q. 15
MULTIPLE_CHOICE
Difficulty: EASY
(1 Mark)
Which tillage implement is standardly used for secondary seedbed preparation and leveling?
A
Moldboard plow
B
Chisel plow
C
Subsoiler
D
Disc harrow and cultivator followed by planking (Sohaga)
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Cultivators and wooden/steel planks break clods and create a smooth level seedbed.
Q. 16
MULTIPLE_CHOICE
Difficulty: HARD
(1 Mark)
What is the optimum soil moisture level (field capacity percentage) for sowing most field crops?
A
10% of field capacity
B
100% saturation (waterlogging)
C
Permanent wilting point
D
50% to 75% of available water capacity
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Adequate aeration and moisture at 50-75% field capacity ensure rapid germination.
Q. 17
MULTIPLE_CHOICE
Difficulty: HARD
(1 Mark)
Which physiological disorder in cotton is associated with sudden wilting and leaf reddening?
A
Boll rot
B
Rust
C
Cotton leaf reddening / Parawilt
✓ Correct
D
Smut
💡
Step-by-Step Explanation & Concept Rationale
Leaf reddening and parawilt result from sudden waterlogging, nutrient imbalance, and low soil temperature.
Q. 18
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
The process of removing male inflorescence (tassel) in hybrid seed production of maize is called:
A
Topping
B
Detasseling
✓ Correct
C
Thinning
D
De-suckering
💡
Step-by-Step Explanation & Concept Rationale
Detasseling female inbred lines prevents self-pollination in hybrid maize seed production.
Q. 19
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
Which oilseed crop has the highest oil content (40-45%) in Pakistan?
A
Soybean
B
Cottonseed
C
Canola / Mustard (Brassica napus)
✓ Correct
D
Corn
💡
Step-by-Step Explanation & Concept Rationale
Canola and mustard seed contain 40-45% high-quality edible oil.
Q. 20
MULTIPLE_CHOICE
Difficulty: HARD
(1 Mark)
Ginning percentage (Lint Index / GOT) in cotton is calculated as:
A
Bolls per plant
B
Seed weight per boll
C
(Weight of lint / Total weight of seed cotton) x 100
✓ Correct
D
(Weight of seed / Total weight) x 100
💡
Step-by-Step Explanation & Concept Rationale
Ginning Out-Turn (GOT) standardly ranges from 33% to 40% in commercial cotton varieties.
Q. 21
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
In applied field conditions: What is the optimum temperature range for wheat germination in Pakistan?
A
35°C to 40°C
B
5°C to 10°C
C
25°C to 30°C
D
15°C to 20°C
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
15-20°C provides optimal thermal units for rapid embryo activation and root development.
Q. 22
MULTIPLE_CHOICE
Difficulty: EASY
(1 Mark)
In applied field conditions: Which growth stage in wheat is most vulnerable to water stress?
A
Dough stage
B
Booting
C
Tillering
D
Crown Root Initiation (CRI)
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
CRI occurring 20-25 days after sowing is critical for establishing nodal roots.
Q. 23
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
In applied field conditions: What is the recommended seed rate for broadcast sowing of wheat under late planting conditions?
A
90-100 kg/acre
B
60-70 kg/acre (150-175 kg/ha)
✓ Correct
C
20-25 kg/acre
D
35-40 kg/acre
💡
Step-by-Step Explanation & Concept Rationale
Higher seed rate compensates for reduced tillering window in late sown wheat.
Q. 24
MULTIPLE_CHOICE
Difficulty: EASY
(1 Mark)
In applied field conditions: Which cropping pattern involves growing two or more crops simultaneously with no distinct row arrangement?
A
Intercropping
B
Relay cropping
C
Mixed cropping
✓ Correct
D
Alley cropping
💡
Step-by-Step Explanation & Concept Rationale
Mixed cropping minimizes risk of total crop loss under variable weather.
Q. 25
MULTIPLE_CHOICE
Difficulty: MEDIUM
(1 Mark)
In applied field conditions: Puddling in paddy rice soil primarily aims to:
A
Dry out the topsoil
B
Promote aerobic nitrification
C
Destroy soil aggregates and minimize water percolation
✓ Correct
D
Increase soil porosity
💡
Step-by-Step Explanation & Concept Rationale
Puddling creates an impervious clay layer that retains standing water in paddy fields.
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Instructions / Reading Passage
25 Questions in this set
Select the best option/antonym for the following English Vocabulary questions:
Q. 1
English Language Comprehension
Difficulty: Medium
(1 Mark)
Autonomy
A
submissiveness
B
dependence
✓ Correct
C
subordination
D
slavery
💡
Step-by-Step Explanation & Concept Rationale
Autonomy refers to self-governance; its opposite is relying on others.
Q. 2
English Language Comprehension
Difficulty: Medium
(1 Mark)
Assert
A
agree
B
acquiesce
C
abjure
✓ Correct
D
abdicate
💡
Step-by-Step Explanation & Concept Rationale
To assert is to state firmly; abjure means to solemnly renounce or deny.
Q. 3
English Language Comprehension
Difficulty: Medium
(1 Mark)
Accord
A
solution
B
act
C
dissent
✓ Correct
D
concord
💡
Step-by-Step Explanation & Concept Rationale
Accord signifies agreement or harmony; dissent represents disagreement.
Q. 4
English Language Comprehension
Difficulty: Medium
(1 Mark)
Alive
A
passive
B
dead
✓ Correct
C
asleep
D
drowsy
💡
Step-by-Step Explanation & Concept Rationale
The direct biological opposite of being alive is being dead.
Q. 5
English Language Comprehension
Difficulty: Medium
(1 Mark)
Ancestors
A
supporters
B
disciples
C
followers
D
descendants
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Ancestors are those from whom one is descended; descendants are one's progeny.
Q. 6
English Language Comprehension
Difficulty: Medium
(1 Mark)
Abdicate
A
claim
✓ Correct
B
snatch
C
plunder
D
seize
💡
Step-by-Step Explanation & Concept Rationale
To abdicate is to renounce a throne or power; to claim is to assert a right to it.
Q. 7
English Language Comprehension
Difficulty: Medium
(1 Mark)
Abhorrence
A
aversion
B
liking
✓ Correct
C
appreciation
D
fear
💡
Step-by-Step Explanation & Concept Rationale
Abhorrence is extreme hatred; liking indicates a feeling of fondness or pleasure.
Q. 8
English Language Comprehension
Difficulty: Medium
(1 Mark)
Acquisitive
A
miserly
B
frugal
✓ Correct
C
simple
D
austere
💡
Step-by-Step Explanation & Concept Rationale
Acquisitive means eager to get wealth; frugal implies being economical or sparing.
Q. 9
English Language Comprehension
Difficulty: Medium
(1 Mark)
Audacious
A
timid
✓ Correct
B
vulgar
C
low
D
unpractised
💡
Step-by-Step Explanation & Concept Rationale
Audacious refers to being bold and daring; timid means showing a lack of courage.
Q. 10
English Language Comprehension
Difficulty: Medium
(1 Mark)
Acquitted
A
entrusted
B
convicted
✓ Correct
C
freed
D
burdened
💡
Step-by-Step Explanation & Concept Rationale
To be acquitted is to be cleared of a charge; to be convicted is to be found guilty.
Q. 11
English Language Comprehension
Difficulty: Medium
(1 Mark)
Absolute
A
scarce
B
limited
✓ Correct
C
faulty
D
efficient
💡
Step-by-Step Explanation & Concept Rationale
Absolute means total or unconditional; limited implies having fixed bounds.
Q. 12
English Language Comprehension
Difficulty: Medium
(1 Mark)
Acute
A
sharp
B
critical
C
dull
✓ Correct
D
sensitive
💡
Step-by-Step Explanation & Concept Rationale
Acute describes something sharp or intense; dull describes something blunt or weak.
Q. 13
English Language Comprehension
Difficulty: Medium
(1 Mark)
Anathematise
A
radiate
B
regulate
C
deceive
D
bless
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
To anathematise is to curse or denounce; its spiritual opposite is to bless.
Q. 14
English Language Comprehension
Difficulty: Medium
(1 Mark)
Addition
A
multiplication
B
subtraction
✓ Correct
C
enumeration
D
division
💡
Step-by-Step Explanation & Concept Rationale
Subtraction is the mathematical operation that removes, while addition adds.
Q. 15
English Language Comprehension
Difficulty: Medium
(1 Mark)
Attract
A
repulse
B
reject
C
repel
✓ Correct
D
distract
💡
Step-by-Step Explanation & Concept Rationale
To attract is to pull toward; to repel is to push away or drive back.
Q. 16
English Language Comprehension
Difficulty: Medium
(1 Mark)
Avoidance
A
possession
B
pursuit
✓ Correct
C
passion
D
power
💡
Step-by-Step Explanation & Concept Rationale
Avoidance is the act of staying away; pursuit is the act of following or chasing.
Q. 17
English Language Comprehension
Difficulty: Medium
(1 Mark)
Alleviation
A
exaggeration
B
exasperation
C
magnification
D
intensification
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
While "alleviation" means to make suffering, deficiency, or a problem less severe (to ease or mitigate), "intensification" means to make something grow more acute, strong, or severe.
Q. 18
English Language Comprehension
Difficulty: Medium
(1 Mark)
Alienate
A
gather
B
identify
C
assemble
D
unite
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
To alienate is to isolate or cause to become unfriendly; to unite is to join together.
Q. 19
English Language Comprehension
Difficulty: Medium
(1 Mark)
Adequate
A
profuse
B
abounding
C
scanty
✓ Correct
D
abundant
💡
Step-by-Step Explanation & Concept Rationale
Adequate means sufficient; scanty means small or insufficient in quantity.
Q. 20
English Language Comprehension
Difficulty: Medium
(1 Mark)
Appointment
A
disappointment
B
suspension
C
dismissal
✓ Correct
D
discharge
💡
Step-by-Step Explanation & Concept Rationale
"Appointment" refers to the act of officially assigning a job, position, or office to someone. Therefore, dismissal (the act of officially removing someone from a job or position) is its direct structural and professional antonym.
Q. 21
English Language Comprehension
Difficulty: Medium
(1 Mark)
Amalgamate
A
generate
B
repair
C
materialize
D
separate
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Amalgamate means to combine into one; separate means to part or divide.
Q. 22
English Language Comprehension
Difficulty: Medium
(1 Mark)
Acclamation
A
denunciation
✓ Correct
B
suppression
C
termination
D
applause
💡
Step-by-Step Explanation & Concept Rationale
Acclamation is loud approval; denunciation is public condemnation.
Q. 23
English Language Comprehension
Difficulty: Medium
(1 Mark)
Ambiguous
A
obscure
B
secular
C
explicit
✓ Correct
D
equivocate
💡
Step-by-Step Explanation & Concept Rationale
Ambiguous means vague or unclear; explicit means stated clearly and in detail.
Q. 24
English Language Comprehension
Difficulty: Medium
(1 Mark)
Antipathy
A
obedience
B
admiration
C
agreement
D
fondness
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Antipathy is a deep-seated feeling of dislike; fondness is affection or liking.
Q. 25
English Language Comprehension
Difficulty: Medium
(1 Mark)
Amicable
A
cunning
B
shy
C
hostile
✓ Correct
D
crazy
💡
Step-by-Step Explanation & Concept Rationale
Amicable refers to friendliness and goodwill; hostile refers to unfriendliness/opposition.
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