AP BIOLOGY

Detailed explanation-1: -Endosperm is a triploid tissue in angiosperms, because double fertilization results in the formation of a diploid zygote and a triploid endosperm.

Detailed explanation-2: -After fertilization, the ovule develops into a seed, and the ovary develops into a fruit.

Detailed explanation-3: -Fertilization is much different with angiosperms than compared to other plant organisms because these plants perform double fertilization. Double fertilization occurs when pollen hits the stamen, or female part of a plant.

Detailed explanation-4: -Angiosperms, also called flowering plants, have seeds that are enclosed within an ovary (usually a fruit), while gymnosperms have no flowers or fruits, and have unenclosed or “naked” seeds on the surface of scales or leaves.

Detailed explanation-5: -Most angiosperms have a Polygonum-type embryo sac with two polar nuclei and produce a triploid (3n) endosperm as in Arabidopsis. In a few species, more than two polar nuclei are present in the central cell leading to the formation of endosperm with a ploidy higher than 3n [3].