1 2 7 5 6 8 4 3

2 1 7 6 5 4 8 3

2 1 7 5 6 8 4 3

1 2 7 6 5 4 8 3

High level progesterone acts as inhibitor / exerts negative feedback

Stimulates secretion of FSH by anterior pituitary gland

Thus no follicles develop and no ovulation takes place

Zero chance of fertilization leading to pregnancy

Zygote - Embryo - Morula - Blastocyst

Zygote - Morula - Blastocyst - Embryo

Zygote - Blastocyst - Morula - Embryo

Zygote - Morula - Embryo - Blastocyst

Involved male and female organs (for flowering plants)

Involved male or female organs (for humans)

Diploid zygote (2n)

Both involved sexual fertilisation in reproductive systems

Zygote grows into embryo

Female gamete is egg produced in ovule while female gamete is egg produced in ovary.

Pollen nuclei fuses with egg nuclei (fertilization) while sperm nuclei fuses with egg nuclei (fertilisation)

Embryo grows inside protective seed coat while embryo grows inside protective womb

Cotyledons provide nourishment while placenta provide nourishment.

Flowering plants: Male gamete is non-motile whereas Mammals: male gamete (sperm) is motile.

Flowering plants: The entire process of meiosis has completed and the female gamete is already formed before fertilization whereas Mammals: Ovum (female gamete) is formed upon penetration of sperm into secondary oocyte, whereby secondary oocyte completes meiosis II.

Fertilization occurs when the gametes (sperm & ovum) fuse.

Flowering plants: Double fertilization occurs. Two male nuclei are involved. One sperm (n) fuses with the female gamete (n) to form the diploid (2n) zygote while the other one sperm (n) fused with the two polar nuclei (n+n) to form triploid (3n) endosperm cell whereas Mammals: Only one fission occurs between the sperm nucleus (n) and the ovum nucleus (n) to form a diploid (2n) zygote.