Question

Entry of pollen tube into the ovule through chalaza was first discovered by Treub in a xerophytes. This plant is associated with a pair of characters given below

I) Unisexual flowers II) Sessile flowers

III) Centripetal arrangement of flowers IV) Bisexual flowers

The correct pair is

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

Answer 1

Answer: (A)

I, II

The entry of pollen tube into the ovule through chalaza is called as chalazogamy. This was discovered by Treub. Example of xerophyte is Casuarina. Casuarina is a plants that can withstand prolonged periods of drought. Flower is bracteate, bracteolate, sessile, incomplete and unisexual.

Thus, the correct answer is option D.