AP BIOLOGY

Detailed explanation-1: -The male gametophyte (pollen grain) produces two male gametes called the sperm cells.

Detailed explanation-2: -Pollen grain is male gametophyte containing generative cell which divides mitotically to give rise to two male gametes.

Detailed explanation-3: -Single meiosis produces four pollen grains. Two male gametes are produced by each pollen grain. As a result, meiosis produces eight male gametes in total.

Detailed explanation-4: -Pollen grains possess two male gametes as it is required for double fertilisation in most angiosperms.

Detailed explanation-5: -The male gametes of angiosperms consist of two sperm cells within a pollen grain or a pollen tube. They are derived from a single generative cell, which is formed as the smaller cell by unequal cell division in the microspore after meiosis.