- 1(current)
Q. No.What happens during fertilisation in humans after many sperms reach close to the ovum?
| 1. | Only two sperms nearest the ovum penetrate zona pellucida. |
| 2. | Secretion of acrosome helps one sperm enter the cytoplasm of the ovum through zona pellucida. |
| 3. | All sperms except the one nearest to the ovum lose their tails. |
| 4. | Cells of corona radiata trap all the sperms except one. |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
| Assertion (A): | In humans, sex is determined at the time of fertilization. |
| Reason (R): | The Y chromosome is the male determining factor in humans. |
| 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. |
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The number of eggs released by the mother if she gave birth to identical twins or fraternal twins would respectively be:
| 1. | 1 and 1 | 2. | 1 and 2 |
| 3. | 2 and 1 | 4. | 2 and 2 |
The thick transparent glycoprotein membrane surrounding a mammalian ovum before implantation is called:
| 1. | oolemma | 2. | corona radiata |
| 3. | zona pellucida | 4. | cumulus oophorus |
If the mammalian ovum fails to get fertilised, which one of the following is unlikely?
| 1. | Oestrogen secretion further decreases. |
| 2. | Progesterone secretion rapidly declines. |
| 3. | Corpus luteum will disintegrate. |
| 4. | Primary follicle starts developing. |
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What ensures that, almost always, only one sperm fertilizes the ovum?
1. Zona pellucida
2. Corona Radiata
3. Acrosome of the sperm
4. Hyaluronic acid surrounding the released ovum
When sperm comes in contact with the zona pellucida:
| 1. | The secondary oocyte completes meiosis II |
| 2. | Steps are taken to prevent polyspermy |
| 3. | Zona pellucida ruptures and the oocyte is hatched that can be fertilized |
| 4. | The sperm loses its tail and body |
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
| Assertion (A): | Fertilization occurs in the fallopian tube. |
| Reason (R): | The released oocyte must be fertilized within 24 hours of its release. |
| 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 chronological order of the events given:
| 1. | acrosomal reaction, decidual reaction, capacitation, implantation, cleavage |
| 2. | acrosomal reaction, capacitation, cleavage, decidual reaction, implantation |
| 3. | capacitation, implantation, cleavage, acrosomal reaction, decidual reaction |
| 4. | capacitation, acrosomal reaction, cleavage, implantation, decidual reaction |
I. is made up of glycoproteins
II. helps prevent polyspermy
III. helps prevent ectopic pregnancy
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II and III |
- 1(current)
Q. No.
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