Question

Micropyle is an opening for entry of ______.

Answer 1

Hint: Small area in a plant ovule's surface through which the tube of pollen passes before fertilization. It results from the nucellus incomplete covering by the integuments. In most seeds from which water is absorbed, it persists as an opening in the testa.

Complete answer:
As we know that in plants, a structure contained inside the flower is the style. It is a long slender stalk connecting the stigma and the ovary.
We must remember that Micropyle is an opening for a male gamete entry. It can be described as the structure that gives rise to and contains the female reproductive cells in seed plants. It is found within the section of the flower called the gynoecium in flowering plants. One or more ovules are formed by the ovary of the gynoecium and eventually become the fruit wall. Via a stalk-like structure known as a funiculus (plural, funiculi), ovules are connected to the placenta in the ovary. Among plant species, distinct patterns of ovule attachment, or placentation, can be found.

Hence, the correct answer is option (B).

Note: The growth of the pollen tube is affected by the stigma-style contact with the pollen grain. With the elongation of the cytoskeleton, the elongation of the tube is accomplished and it extends from the edge. By species, the length of the pollen tube varies. It develops in an oscillating manner until the sperm near the egg is ready to be released for fertilization to take place. Pollen tubes are an exemplary model for understanding the behavior of plant cells.