NEETBotanySexual Reproduction in Flowering Plants
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The egg apparatus is situated at the chalazal end of the embryo sac and consists of two synergids and one egg cell. Reason (R): The synergids have special cellular thickenings at the micropylar tip called filiform apparatus, which play an important role in guiding the pollen tubes into the synergid
Options
- ABoth (A) and (R) are true and (R) is the correct explanation of (A).
- BBoth (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
D. (A) is false but (R) is true.
Step-by-step solution
The egg apparatus is a 3-celled structure consisting of one egg cell and two synergids, but it is located at the micropylar end of the embryo sac, not the chalazal end. Three cells are grouped together at the chalazal end and are called the antipodals. Therefore, Assertion (A) is false. The synergids possess special cellular thickenings at their micropylar tip known as the filiform apparatus. This structure plays a crucial role in guiding the pollen tubes into the synergid. Therefore, Reason (R) is true. Answer: (A