Q. No.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
What maintains the corpus luteum after fertilization?
| 1. | release of HCG by the trophoblast to maintain the corpus luteum. |
| 2. | production of LH by the maternal pituitary. |
| 3. | maintenance of the corpus luteum by prolactin. |
| 4. | production of estrogen by the adenohypophysis. |
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 |
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 |
Match each item in Column I with one item in Column II and chose your answer from the codes given below :
|
Column I (hormone) |
Column II (function) |
|
I. hCG II. hPL III. Inhibin IV. Relaxin |
1. Maintains corpus luteum 2. Stimulates mammary growth 3. Regulation of LH and FSH production 4. Dilation of the uterine cervix at parturition |
| Code | I | II | III | IV |
| 1. | 1 | 2 | 3 | 4 |
| 2. | 2 | 1 | 4 | 3 |
| 3. | 2 | 1 | 3 | 4 |
| 4. | 1 | 2 | 4 | 3 |
Each seminiferous tubule is lined by male germ cells called:
| 1. | Spermatogonia | 2. | Primary spermatocytes |
| 3. | Sertoli cells | 4. | Leydig cells |
FSH:
| 1. | Acts on Sertoli cells and stimulates secretion of some factors that help in spermiogenesis |
| 2. | Acts on Sertoli cells and inhibits secretion of some factors that help in spermiogenesis |
| 3. | Acts on Leydig cells and stimulates secretion of some factors that help in spermiogenesis |
| 4. | Acts on Leydig cells and inhibits secretion of some factors that help in spermiogenesis |
The testes are situated outside the abdominal cavity within a pouch called the scrotum. This is necessary as:
| 1. | The scrotum can contain lengthy ducts for the transfer of sperms |
| 2. | Scrotum helps in maintaining the low temperature of the testes necessary for spermatogenesis |
| 3. | Scrotum reduces the pressure around the testes necessary for spermatogenesis |
| 4. | Scrotum can store huge amounts of sperms |
The final release of sperms from the seminiferous tubules is called:
| 1. | Spermiation | 2. | Emission |
| 3. | Retrograde ejaculation | 4. | Ejaculation |
Which of the following helps spermatids in their transformation to sperms?
| 1. | Leydig cells | 2. | Type B spermatogonia |
| 3. | Type A spermatogonia | 4. | Sertoli cells |
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