question_answer

Directions : (31 - 35)

Read the passage given below and answer the following questions. In autogamy, pollination is achieved within the same flower. Transfer of pollen grains from the anther to the stigma of the same flower. In a normal flower which opens and exposes the anthers and the stigma, complete autogamy is rather rare. Autogamy in such flowers requires synchrony in pollen release and stigma receptivity and also, the anthers and the stigma should lie close to each other so that self-pollination can occur. Some plants produce two types of following flowers -

[a] Chasmogamous or Open flowers : Flowers with exposed anthers and stigma e.g., Catharanthus = (Vinca), Mrabilis, Potato, Sunflower etc.

[b] Cleistogamous or Close flowers : Flower does not open at all. In such flowers, the anthers and stigma lie close to each other e.g., Viola (common pansy), Oxalis, and Commelina.

Autogamy is an example of -

A) Cross pollination

B) Self-pollination

C) Both of the above

D) None of the above