Human Development

Ovarian events: Formation of corpus luteum from the ruptured follicle. Uterine events: Thickening of the endometrium for implantation. Hormones: Progesterone secretion by the corpus luteum prepares the uterus for implantation.

N/A

After the entry of one sperm into the egg, a fertilisation membrane develops around the egg, preventing the entry of additional sperms. This ensures monospermy.

Endosperm development precedes embryo development in angiosperm seeds to provide the necessary nutrients for the developing embryo. The endosperm stores and supplies food materials to support the initial stages of embryo growth. - Endosperm forms after the fusion of one sperm nucleus with two polar nuclei, ensuring the availability of nutrients for the zygote. - In albuminous seeds, such as wheat and maize, the endosperm persists in the mature seed and acts as a storage tissue for nutrients, including starch, proteins, and oils, required for seed germination and growth.