Question

In the most common pattern of embryo sac development in angiosperms, how many nuclei end up at the chalazal end?

a. 1
b. 3
c. 5
d. 7
e. 9

Answer 1

In the most common pattern of embryo sac development in angiosperms, 7 nuclei end up at the chalazal end.

Step-by-step explanation:

In the most common pattern of embryo sac development in angiosperms, the correct number of nuclei that end up at the chalazal end is d. 7. After fertilization, the zygote divides to form an upper terminal cell and a lower basal cell. The basal cell gives rise to the suspensor, which eventually connects with the maternal tissue. The terminal cell divides and forms a globular pro-embryo, which develops into the embryo sac with seven cells, including an egg and a central cell with two haploid nuclei.