📖 Tier 1: Prepare & Study Guide ✓ 100% Solved with Rationales

Plant Cytogenetics, Molecular Biology & Plant Biotechnology (Botany & Plant Sciences) Solved Questions & Notes (2026) - Apex Rankers

Natural & Physical Sciences > Botany & Plant Sciences > Plant Cytogenetics, Molecular Biology & Plant Biotechnology

100 Total Questions
~150 mins Read Time
1 Subject Areas
🎯 Launch Practice Mode
Q. 1 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
Mendel's Law of Independent Assortment applies to genes that are:
A
Located on different non-homologous chromosomes (or far apart without linkage)
✓ Correct
B
Lethal
C
Only in chloroplast DNA
D
Tightly linked on the same chromosome
💡 Step-by-Step Explanation & Concept Rationale
Unlinked genes assort independently into gametes during Meiosis I metaphase alignment.
Q. 2 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
Plant tissue culture technique 'Totipotency' refers to the ability of:
A
Seeds to store oil
B
Cells to produce flowers only
C
A single living plant cell to regenerate into a complete, fertile whole plant
✓ Correct
D
Cells to divide endlessly without differentiation
💡 Step-by-Step Explanation & Concept Rationale
Gottlieb Haberlandt's concept proves every nucleated plant cell retains full genomic developmental potential.
Q. 3 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
Agrobacterium tumefaciens is used as a natural genetic engineer in plant biotechnology due to its:
A
Insecticidal toxin
B
Viral coat
C
Ti (Tumor-inducing) plasmid transferring T-DNA into the plant nuclear genome
✓ Correct
D
Antibiotic resistance
💡 Step-by-Step Explanation & Concept Rationale
Disarmed Ti plasmids deliver recombinant transgene cassettes into host crop chromosomes.
Q. 4 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
CRISPR-Cas9 gene editing technology functions by utilizing:
A
Radiation beams
B
Random chemical mutation
C
Fungal infections
D
A guide RNA (gRNA) directing Cas9 endonuclease to introduce precise double-strand DNA breaks
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Targeted double-strand breaks enable precise gene knockouts or knock-ins in modern plant breeding.
Q. 5 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
Somaclonal variation in plant cell cultures represents:
A
Identical clonal duplicates
B
Soil contamination
C
Genetic or epigenetic variability arising in plants regenerated from in vitro cell culture
✓ Correct
D
Seed decay
💡 Step-by-Step Explanation & Concept Rationale
Tissue culture stress induces chromosomal rearrangements, point mutations, and DNA methylation shifts.
Q. 6 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
In professional practice: Mendel's Law of Independent Assortment applies to genes that are:
A
Only in chloroplast DNA
B
Located on different non-homologous chromosomes (or far apart without linkage)
✓ Correct
C
Lethal
D
Tightly linked on the same chromosome
💡 Step-by-Step Explanation & Concept Rationale
Unlinked genes assort independently into gametes during Meiosis I metaphase alignment.
Q. 7 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
In professional practice: Plant tissue culture technique 'Totipotency' refers to the ability of:
A
Cells to divide endlessly without differentiation
B
Seeds to store oil
C
Cells to produce flowers only
D
A single living plant cell to regenerate into a complete, fertile whole plant
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Gottlieb Haberlandt's concept proves every nucleated plant cell retains full genomic developmental potential.
Q. 8 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
In professional practice: Agrobacterium tumefaciens is used as a natural genetic engineer in plant biotechnology due to its:
A
Antibiotic resistance
B
Insecticidal toxin
C
Viral coat
D
Ti (Tumor-inducing) plasmid transferring T-DNA into the plant nuclear genome
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Disarmed Ti plasmids deliver recombinant transgene cassettes into host crop chromosomes.
Q. 9 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
In professional practice: CRISPR-Cas9 gene editing technology functions by utilizing:
A
Fungal infections
B
Random chemical mutation
C
A guide RNA (gRNA) directing Cas9 endonuclease to introduce precise double-strand DNA breaks
✓ Correct
D
Radiation beams
💡 Step-by-Step Explanation & Concept Rationale
Targeted double-strand breaks enable precise gene knockouts or knock-ins in modern plant breeding.
Q. 10 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
In professional practice: Somaclonal variation in plant cell cultures represents:
A
Identical clonal duplicates
B
Genetic or epigenetic variability arising in plants regenerated from in vitro cell culture
✓ Correct
C
Soil contamination
D
Seed decay
💡 Step-by-Step Explanation & Concept Rationale
Tissue culture stress induces chromosomal rearrangements, point mutations, and DNA methylation shifts.
Q. 11 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
According to standard examination standards: Mendel's Law of Independent Assortment applies to genes that are:
A
Located on different non-homologous chromosomes (or far apart without linkage)
✓ Correct
B
Tightly linked on the same chromosome
C
Only in chloroplast DNA
D
Lethal
💡 Step-by-Step Explanation & Concept Rationale
Unlinked genes assort independently into gametes during Meiosis I metaphase alignment.
Q. 12 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
According to standard examination standards: Plant tissue culture technique 'Totipotency' refers to the ability of:
A
Seeds to store oil
B
Cells to produce flowers only
C
Cells to divide endlessly without differentiation
D
A single living plant cell to regenerate into a complete, fertile whole plant
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Gottlieb Haberlandt's concept proves every nucleated plant cell retains full genomic developmental potential.
Q. 13 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
According to standard examination standards: Agrobacterium tumefaciens is used as a natural genetic engineer in plant biotechnology due to its:
A
Insecticidal toxin
B
Ti (Tumor-inducing) plasmid transferring T-DNA into the plant nuclear genome
✓ Correct
C
Viral coat
D
Antibiotic resistance
💡 Step-by-Step Explanation & Concept Rationale
Disarmed Ti plasmids deliver recombinant transgene cassettes into host crop chromosomes.
Q. 14 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
According to standard examination standards: CRISPR-Cas9 gene editing technology functions by utilizing:
A
Radiation beams
B
Fungal infections
C
Random chemical mutation
D
A guide RNA (gRNA) directing Cas9 endonuclease to introduce precise double-strand DNA breaks
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Targeted double-strand breaks enable precise gene knockouts or knock-ins in modern plant breeding.
Q. 15 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
According to standard examination standards: Somaclonal variation in plant cell cultures represents:
A
Identical clonal duplicates
B
Genetic or epigenetic variability arising in plants regenerated from in vitro cell culture
✓ Correct
C
Seed decay
D
Soil contamination
💡 Step-by-Step Explanation & Concept Rationale
Tissue culture stress induces chromosomal rearrangements, point mutations, and DNA methylation shifts.
Q. 16 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
From an applied perspective: Mendel's Law of Independent Assortment applies to genes that are:
A
Lethal
B
Located on different non-homologous chromosomes (or far apart without linkage)
✓ Correct
C
Only in chloroplast DNA
D
Tightly linked on the same chromosome
💡 Step-by-Step Explanation & Concept Rationale
Unlinked genes assort independently into gametes during Meiosis I metaphase alignment.
Q. 17 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
From an applied perspective: Plant tissue culture technique 'Totipotency' refers to the ability of:
A
A single living plant cell to regenerate into a complete, fertile whole plant
✓ Correct
B
Cells to divide endlessly without differentiation
C
Seeds to store oil
D
Cells to produce flowers only
💡 Step-by-Step Explanation & Concept Rationale
Gottlieb Haberlandt's concept proves every nucleated plant cell retains full genomic developmental potential.
Q. 18 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
From an applied perspective: Agrobacterium tumefaciens is used as a natural genetic engineer in plant biotechnology due to its:
A
Antibiotic resistance
B
Insecticidal toxin
C
Viral coat
D
Ti (Tumor-inducing) plasmid transferring T-DNA into the plant nuclear genome
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Disarmed Ti plasmids deliver recombinant transgene cassettes into host crop chromosomes.
Q. 19 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
From an applied perspective: CRISPR-Cas9 gene editing technology functions by utilizing:
A
A guide RNA (gRNA) directing Cas9 endonuclease to introduce precise double-strand DNA breaks
✓ Correct
B
Fungal infections
C
Random chemical mutation
D
Radiation beams
💡 Step-by-Step Explanation & Concept Rationale
Targeted double-strand breaks enable precise gene knockouts or knock-ins in modern plant breeding.
Q. 20 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
From an applied perspective: Somaclonal variation in plant cell cultures represents:
A
Identical clonal duplicates
B
Genetic or epigenetic variability arising in plants regenerated from in vitro cell culture
✓ Correct
C
Seed decay
D
Soil contamination
💡 Step-by-Step Explanation & Concept Rationale
Tissue culture stress induces chromosomal rearrangements, point mutations, and DNA methylation shifts.
Q. 21 MULTIPLE_CHOICE
Difficulty: MEDIUM (1 Mark)
Under standard operational protocols: Mendel's Law of Independent Assortment applies to genes that are:
A
Tightly linked on the same chromosome
B
Lethal
C
Only in chloroplast DNA
D
Located on different non-homologous chromosomes (or far apart without linkage)
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Unlinked genes assort independently into gametes during Meiosis I metaphase alignment.
Q. 22 MULTIPLE_CHOICE
Difficulty: EASY (1 Mark)
Under standard operational protocols: Plant tissue culture technique 'Totipotency' refers to the ability of:
A
Cells to produce flowers only
B
Seeds to store oil
C
Cells to divide endlessly without differentiation
D
A single living plant cell to regenerate into a complete, fertile whole plant
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Gottlieb Haberlandt's concept proves every nucleated plant cell retains full genomic developmental potential.
Q. 23 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
Under standard operational protocols: Agrobacterium tumefaciens is used as a natural genetic engineer in plant biotechnology due to its:
A
Antibiotic resistance
B
Viral coat
C
Ti (Tumor-inducing) plasmid transferring T-DNA into the plant nuclear genome
✓ Correct
D
Insecticidal toxin
💡 Step-by-Step Explanation & Concept Rationale
Disarmed Ti plasmids deliver recombinant transgene cassettes into host crop chromosomes.
Q. 24 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
Under standard operational protocols: CRISPR-Cas9 gene editing technology functions by utilizing:
A
Radiation beams
B
Random chemical mutation
C
A guide RNA (gRNA) directing Cas9 endonuclease to introduce precise double-strand DNA breaks
✓ Correct
D
Fungal infections
💡 Step-by-Step Explanation & Concept Rationale
Targeted double-strand breaks enable precise gene knockouts or knock-ins in modern plant breeding.
Q. 25 MULTIPLE_CHOICE
Difficulty: HARD (1 Mark)
Under standard operational protocols: Somaclonal variation in plant cell cultures represents:
A
Seed decay
B
Soil contamination
C
Identical clonal duplicates
D
Genetic or epigenetic variability arising in plants regenerated from in vitro cell culture
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Tissue culture stress induces chromosomal rearrangements, point mutations, and DNA methylation shifts.
Study Stream Progress: Showing 25 of 100 Questions (25%)
Jump to:

Ready to Test Your Retention & Speed?

Now that you have reviewed the study questions and rationales, test yourself in our interactive 1-by-1 practice engine or take the full official timed mock exam.