Micropyle of seed is involved in the passage of
a. Male Gamete
b. Pollen Tube
c. Water
d. Gases

Hint: Germination is generally the growth of a plant enclosed within a seed; it results in the creation of the seedling. It is also the method of reactivation of the metabolic mechanism of the seed resulting in the appearance of radicle and plumule. Micropyle of seed is a minute opening in the integument of an ovule of a seed plant.

Complete answer:
A micropyle is a thin pore or passage formed by the protuberance of the integuments throughout which the pollen tube enters into the ovule. Seeds have a micropyle through which water pierces into the seed in germination.

A small aperture in the surface of a plant ovule by which the pollen tube passes preceding to fertilization. It results from the partial covering of the nucellus by the integuments. It persists as an opening in the testa of most seeds by which water is absorbed.

In flowering plants, male gametes are surrounded within pollen grains, which are liberated from the anthers at anthesis. The pollen tube rises into one of two synergid cells, which undergoes cell demise and degenerates.

A pollen tube is a tubular structure created by the male gametophyte of seed plants once it germinates. Pollen tube elongation is a vital stage in the plant living cycle. Aerenchyma offers a low‐resistance inner pathway for gas transport between shoots and root extremities.

Hence, the correct answer is option (C).

Note: The presence of water is the most significant factor. Without water, cells cannot do their necessary activities and the seed will not germinate. When a seed soaks up water, it is called imbibition. Water enters the seed either through a minute gap in the seed known as micropyle or by the seed coat. The micropyle is also the place at which the pollen tube pierces the ovule during fertilization.