Describe the functions of the following: |
(i) Epididymis |
(ii) Vas deferens |
(iii) Seminiferous tubules |
(iv) Vagina |
(v) Trophoblast |
OR |
Study the given figure. |
(i) Pick out and name the cells that undergo spermiogenesis. |
(ii) Name 'A' and 'B' cells. What is the difference between them with reference to the number of chromosome? |
(iii) Pick out and name the motile cells. |
(iv) What is 'F' cell? Mention its function. |
(v) Name the structure of which the given diagram is apart. |
Answer:
(i) Epididymis: Maturation of spermatids to functional spermatozoa takes place here and the sperms are stored temporarily, become motile and mature in 1 -2 months and acquire the capacity of fertilization.
(ii) Vas Deferens: It stores and transports the sperms from the testes to the outside through urethra.
(iii) Seminiferous Tubules: Inside each testis there are 250 compartments called testicular folliculi/lobules each having 1-3 seminiferous tubules. The sperms are produced inside these tubules and pass outside the testis.
(iv) Vagina: It receives the semen from the male penis. It serves as the birth canal during parturition.
(v) Trophoblast: It is the inner layer of blastocyst, which sends finger-like projections called chorionic villi into uterine stroma. Chorionic villi and uterine tissues jointly form the placenta.
OR
(i) D-Spermatids.
(ii) A-Spermiogonium, B-Primary spermatocyte.
They both are diploid and have 46 chromosomes each.
(iii) E-Spermatozoa.
(iv) F-Sertoli cell. It provides nutrition to the germ cells.
(v) Seminiferous tubule.
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