Question

In many plants, though stamens and ovules are produced by the same flower self-fertilisation does not occur because

• A. Stamen is not compatible with the pistil.
• B. The DNA of pollen grain and the ovule belongs to different species.
• C. Anthers and ovules mature at different times.
• D. Stigma does not hold the gametes belonging to the same flower.

Answer 1

The correct option is C Anthers and ovules mature at different times.

Self Pollination does takes place in bisexual flowers because pollination is merely the transfer of pollen grains from anther to the stigma.
Self-fertilization does not occur because the stigma is not yet receptive to the pollen grain or the pollen grain hasn't matured yet.