Question

In a cucumber, pollen tube enters embryo sac through

• A. Integuments
• B. Micropyle
• C. Endosperm
• D. Chalaza

Answer 1

The correct option is A Integuments

• Pollen tube eventually reaches the micropyle of an ovule to enter the embryo sac and for this purpose, it may follow one of the following three routes:
• 1. Porogamy- when the pollen tube enters the ovule through the micropyle. It is common for most of the angiosperms.
• 2. Mesogamy- when the pollen tube enters through the integuments (Cucumber) or through funiculus (Pistacia).

• 3. Chalazogamy- when the pollen tube enters through the chalazal tissues (Casuarina).
• Hence In a cucumber, pollen tube enters embryo sac through Intehuments.
• So, the correct answer is 'Integuments'.