Micropyle is a small pore above hilum through which pollen tube can enter.

Micropyle is a small pore above hilum through which pollen tube can enter.

• A. Endosperm
• B. Micropyle
• C. Aleurone Layer
• D. Small Pore

Answer: (B)

The main idea here is that the micropyle is the tiny opening in the ovule where the pollen tube gains entry to reach the embryo sac. After the pollen grain lands on the stigma and the tube grows down the style, it must penetrate the ovule through this opening. Once inside, the tube releases sperm cells that fertilize the egg and the central cell, forming the zygote and the endosperm, respectively. This makes the micropyle the specific structure described—the entry pore for the pollen tube. Endosperm and aleurone layer are outcomes of fertilization or later seed development, not entry points for the pollen tube, and a generic “small pore” doesn’t name the actual structure involved.

The main idea here is that the micropyle is the tiny opening in the ovule where the pollen tube gains entry to reach the embryo sac. After the pollen grain lands on the stigma and the tube grows down the style, it must penetrate the ovule through this opening. Once inside, the tube releases sperm cells that fertilize the egg and the central cell, forming the zygote and the endosperm, respectively. This makes the micropyle the specific structure described—the entry pore for the pollen tube. Endosperm and aleurone layer are outcomes of fertilization or later seed development, not entry points for the pollen tube, and a generic “small pore” doesn’t name the actual structure involved.