State any two pre‑zygotic barriers that can prevent fertilisation in flowering plants.
Answer
Temporal isolation and morphological incompatibility
The correct answer is Temporal isolation and morphological incompatibility — List any two such barriers as the answer.
Step-by-step solution
- Recall that pre‑zygotic barriers act before gamete fusion.
- Temporal isolation: male and female parts mature at different times, preventing pollen‑stigma contact.
- Morphological incompatibility: differences in flower shape or stigma surface prevent pollen adhesion or germination.
- List any two such barriers as the answer.
Common mistake: Including post‑zygotic barriers like hybrid sterility
Concept tested: Pre‑zygotic reproductive isolation
Published · How this solution was prepared and checked
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