Question

A pollen tube enters the ovule through chalaza lying opposite the micropyle. It will enter the embryo sac through.

• A. Chalazal end
• B. Laterally
• C. Antipodal haustorium
• D. Micropylar end

Answer 1

The correct option is D Micropylar end

Pollen tube eventually reaches the micropyle of an ovule and for this purpose, it may follow one of the following three routes:

1. Porogamy- when the pollen tube enters the ovule through micropyle. It is common in most of the angiosperms.

2. Mesogamy- when the pollen tube enters through the integuments or through funiculus.

3. Chalazogamy- when the pollen tube enters through the chalazal tissues.

Hence, pollen tube ultimately reaches the micropyle of the ovule through any of these pathways but eventually it will enter the embryo sac from the micropylar end.

So, the correct answer is D.