Answer: Do not open and ensure assured self-pollination.
- A Cannot set seed at all
- B Open very widely to attract many flying insects
- C Do not open and ensure assured self-pollination
- D Produce only male gametes
Correct answer: C. Do not open and ensure assured self-pollination
Explanation: Cleistogamous flowers never open, so anthers and stigma lie close together and autogamy (self-pollination) is assured even in the absence of pollinators.
Double fertilisation in angiosperms: one male gamete fuses with the egg to form the diploid zygote (syngamy), while the second fuses with the two polar nuclei to form the triploid primary endosperm nucleus (triple fusion). Image: Triploid, CC BY 3.0, via Wikimedia Commons.
Concept context
Flower structure, pollination, double fertilization, and seed/fruit development - the highest-scoring Class 12 biology chapter in NEET.
Read the full Sexual Reproduction in Flowering Plants notes →