Which of the following is found inside a pollen grain? the female gametophyte, the male gametophyte, the megaspore, the sporophyte

the male gametophyte

Explanation:

Pollen grains are structures in the seed plants (spermatophytes) which contain vegetative cells  but also reproductive cells - microgametophytes. Microgametophytes produce 2 male gametes or sperm cells. Vegetative cells produce pollen tube which is involved in the transfer of sperm cells to the ovule (female structure that forms female gametes). Pollen grains are different in shape, size and color, but all of them are enveloped with hard coat that has protective role.

the answer to your question is b

some fungi obtain their nutrients from a living host (plant or animal) and are called most biotrophic fungi have fairly narrow host ranges—they are specialized on a limited called rhizomorphs that allow the fungus to grow from one tree to another. ascospores are formed inside a sac-like structure called an ascus. so your answer is a