| Direction: Each of these questions contains two statements Assertion [A] and Reason [R]. Each of these questions also has four alternative choices, any one of which is the correct answer. You have to select one of the codes [a], [b], [c] and [d] given below. |
| Assertion [A] Synergids play an important role in directing the pollen tube growth. |
| Reason [R] Because synergids secrete some chemotropically active substance. |
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true, but R is not the correct explanation of A
C) A is true, but R is false
D) A is false, but R is true
Correct Answer: A
Solution :
[a] Both A and R are true and R is the correct explanation of A. Synergids are part of the egg apparatus along with the egg cell. The pollen germinates on the stigma to form the pollen tube. The pollen tube reaches the egg cell by chemotropism. A chemical stimulus is produced by synergids.
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