D.
1. Describe the formation and path of
path of sperm
from testis to exit through urethra.
2. What is ‘fertilization? How fertilization is
related to gametes?
3. What is metamorphosis? Explain it with
reference to the developmental stages of frog.
4. Describe the post-fertilization stages till the
formation of foetus in woman.
Answers
Explanation:
The testes are where sperm is manufactured. When ejaculation occurs, sperm are forcefully expelled from the tail of the epididymis into the vas deferens. ... Sperm then travel through the vas deferens through up the spermatic cord into the pelvic cavity, over the ureter to the prostate behind the bladder.
Gametes are mature, haploid cells that develop from germ cells following meiosis, mitosis, and cell differentiation. During the process of fertilization, a series of reactions triggers the fusion of gametes to produce a diploid cell called a zygote.
From Egg to Embryo
First, the zygote becomes a solid ball of cells. Then it becomes a hollow ball of cells called a blastocyst. Inside the uterus, the blastocyst implants in the wall of the uterus, where it develops into an embryo attached to a placenta and surrounded by fluid-filled membranes.
