DENDROLOGY

Detailed explanation-1: -After pollen tube burst inside the female gametophyte, the two sperm cells fuse with the egg and central cell initiating seed development. The fertilized central cell forms the endosperm while the fertilized egg cell, the zygote, will form the actual embryo and suspensor.

Detailed explanation-2: -Seed development in flowering plants proceeds in three discrete, although continuous, stages: early, mid-, and late embryogenesis. In early embryogenesis, there is extensive cell division activity; also, the body plan of the embryo is laid down and endosperm development begins.

Detailed explanation-3: -The Seed Plants chapter discussed the fertilization of the egg within the ovule. The zygote ultimately divides to produce the mature embryo, the ovule develops into a seed, and the ovary that contained one or more ovules develops into a fruit.