Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): | All mitochondria in the bodily cells of an individual normally derive from the mother alone. |
Reason (R): | The sperm has a large number of mitochondria in the body that are spirally arranged. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Identify the correct statement:
1. | Sertoli cells help in spermiation |
2. | The sperms are stored in seminal vesicles in humans |
3. | Corpus Albicans secretes large amounts of progesterone |
4. | For normal fertility, at least 40% sperms must show vigorous motility |
Chose the correct chronological order in which the following cells are produced:
a. | primary spermatocytes | b. | secondary spermatocytes |
c. | spermatids | d. | spermatogonia |
e | sperm cells |
1. | a,b,c,d,e | 2. | b,a,c,e,d |
3. | c,a,b,d,e | 4. | d,a,b,c,e |
A cross-section at the midpoint of the middle piece of a human sperm will show :
1. | centriole, mitochondria, and 9+2 arrangement of microtubules |
2. | centriole and mitochondria |
3. | mitochondria and 9+2 arrangement of microtubules |
4. | 9+2 arrangement of microtubules only |
Identify the cells that are haploid: (1) spermatogonia (2) primary spermatocytes (3) secondary spermatocytes (4) spermatids (5) spermatozoa
1. | 1, 2, and 3 | 2. | 2, 3, 4, and 5 |
2. | 3, 4, and 5 | 4. | 4 and 5 only |
An organelle covering the head of animal sperm and containing enzymes that digest the egg cell coating, thus permitting the sperm to enter the egg is called as:
1. | nebenkern | 2. | manchette |
3. | head | 4. | acrosome |
In humans, the process of spermatogenesis in males and oogenesis in females are similar in:
1. | Age at which the processes begin |
2. | The number of resultant haploid cells |
3. | Cytokinesis |
4. | Occurring in respective primary sex organs |
The process of maturation of spermatids to sperms and the cells that facilitate this process are respectively:
1. spermiogenesis; sustentacular cells
2. spematocytogenesis; spermatogonia
3. spermiation; Sertoli cells
4. spermatogenesis; interstitial cells
Sperm-producing cells have unique antigens yet they are not attacked by the immune cells because of:
1. | antigens are recognized as self-antigens. |
2. | acrosome at the tip. |
3. | protection by the blood-testis barrier. |
4. | inhibitors attached on the surface. |
The term used to describe the changes that happen to the sperm inside the female reproductive tract that allows the sperm to become capable of fertilizing the egg is:
1. | spermiogenesis | 2. | the acrosomal reaction |
3. | capacitation | 4. | implantation |