Advertisements
Advertisements
Question
The normal body cell of an organism contains 28 pairs of chromosomes. The number of chromosomes present in its germ cell will be:
Options
28
14
56
42
Advertisements
Solution
14
Explanation:
A germ cell has 14 pairs of chromosomes, i.e., half the number of chromosomes present in the normal body cell of an organism.
RELATED QUESTIONS
Explain how the embryo gets nourishment inside the mother’s body.
Where is the female gamete formed in humans?
When a female child is born, her ovaries already contain thousands of immature eggs (or ova) contained in immature structures A. On maturing, A bursts open and an egg shoots out of the ovary in a process called B. The process B starts in the females at puberty and occurs again and again after a time period x. Before every occurrence of process B, the inner lining of uterus becomes thick and soft with lots of blood vessels in it. When the egg cell gets fertilised by a sperm, then an event C occurs in the life of mature human female which lasts for time period y leading to the birth of baby. If, however, the egg cell released by the ovary does not get a sperm to fuse with, then the thick and soft inner lining of uterus breaks down and comes out of the female's body in an event called D. The occurrence of event D is controlled by chemical substances E.
(a) What are A?
(b) What is process B?
(c) What is the time period x?
(d) Name the event C.
(e) How much is the time period y?
(f) What is the name of process D?
(g) Name the chemical substances E.
Write the functions of secretions of prostate gland and seminal vesicles in humans.
Label the folowing diagram
Choose the Odd One Out:
Multiple Choice Question:
What will happen if the temperature of the scrotal sacs temporarily goes to about 2°C lower than body temperature?
______ is a lytic enzyme released by the sperm.
Cryptorchidism is a condition where ______.
Match Columns I and II and select the correct option.
| Columns I | Columns II | ||
| i. | Transfer of sperms in the female genital tract. | a. | Gestation |
| ii. | Delivery of baby | b. | Fertilization |
| iii. | Fusion of male and female gamete. | c. | Parturition |
| iv. | Formation of sperms and ovum | d. | Insemination |
| e. | Gametogenesis |
