Question

Consider the following statements.
I. A pre-zygotic barrier to self-fertilization in plants that otherwise produce fully functional gametes.
II. An interspecific reproductive barrier regulated by genetically determined self-recognition self-rejection mechanism.
III. An intraspecific reproductive barrier, where cell to cell recognition allows the pistil to recognize and reject pollen from a genetically related individual.
IV. A pre-zygotic barrier to self-fertilization in plants that produce non-functional male gametes.
Which of the given statements is/are correct?

• A. I , II , III and IV
• B. I, II and III
• C. III and IV
• D. I only

Answer 1

Answer: (B)

I, II and III

The statements given are methods to prevent self-pollination by following plants:-

i) Making stamen and pistil mature at different times known as incompatibility.

ii) By producing unisexual flowers.

iii) Pollen release and stigma receptivity are not synchronized.

iv) By pollen and pistil interaction in which stigma reject the pollen of same species or plants.

So the correct option is 'I, II and III'.