Question

1. what are the parts of a seed?

stigma, style, ovary
polar nuclei, sperm, egg
tube, generative nucleus, pollen grain
endosperm, embryo, seed coat

Explanation:

A seed consists of three main parts. The seed coat is the protective outer layer. The embryo is the young plant that will grow into a new plant. The endosperm provides nutrients to the embryo.
Stigma, style, ovary are parts of the female reproductive structure in flowers. Polar nuclei, sperm, egg are involved in fertilization. Tube, generative nucleus, pollen grain are related to pollen.

Answer:

endosperm, embryo, seed coat