Fertilsation in Mammals and Plants

Question 1

How is a diploid zygote formed (Humans)

Answer 1

Once the head is inside the ovum it absorbs water and swells releasing its chrosomes to fuse with those of the ovum

Question 2

how does a pollen grain forms in the anther

Answer 2

Pollen grains are produced by meiosis of microspore mother cells that are located along the inner edge of the anther sacs

Question 3

how does a embryo sac form in the ovule

Answer 3

the division of the haploid megaspore nucleus