CBSE Class 10 Answered

Hydrophily is a form of pollination whereby pollen is distributed or transported by the flow of waters, particularly in rivers and streams. Water-pollinated plants occur in 31 genera in 11 different families. Pollen is either dispersed underwater or on the water's surface. Denser than water, it is carried by the current.

Acrosome is a process at the anterior end of a sperm cell that produces enzymes to facilitate penetration of the egg. It is derived from the Golgi complex during the maturation of the sperm. It contains a variety of enzymes that digest proteins and complex sugars. The contents of the acrosome are secreted once the sperm contacts the egg.  The acrosome fuses with the sperm membrane  which results in the release of the contents prin the acrosome into the sperm's surroundings. These enzymes will break down the zona pellucida that envelopes the egg, forming a thin path that allows the sperm to approach the egg and fuse with its cytoplasm.