Question

Name the phenomenon of two flowers, one having long stamens and short styles, and other having short stamens and long style :

• A. Allogamy
• B. Dicliny
• C. Heterostyly
• D. Herkogamy

Answer 1

The correct option is C Heterostyly

Heterostyly is the presence of 2 or 3 types of flowers within the same plant and such flowers differ in the length of style and stamens.

Example, Primula which shows distyly.
It has two types of flowers:
1. Pin eyed flowers: These have long styles with short stamens.
2. Thrum eyed flowers: These have a short style and long stamens.

Dicliny is the presence of only one kind of reproductive whorl in a flower. Allogamy or cross-fertilization is the fertilization of an ovum from one individual with the spermatozoa of another. When the pollen of the flower is unable to reach the stigma of the same flower, it is called herkogamy. Example -Orchid, Pansy flower.

So, the correct answer is C.