Assertion (A): | Gametes are haploid cells. |
Reason (R): | All sexually reproducing organisms produce gametes only by meiosis. |
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. | (A) is false but (R) is true. |
1. | Pteridophyte | 2. | Bryophyte |
3. | Humans | 4. | Gymnosperms |
1. | A is the female thallus of Marchantia and B is the male thallus of Marchantia |
2. | A is the male thallus of Marchantia and B is the female thallus of Marchantia |
3. | A is the female thallus of Chara and B is the male thallus of Chara |
4. | A is the male thallus of Chara and B is the female thallus of Chara |
Which of the following is the most critical event of sexual reproduction?
1. | Gametogenesis | 2. | Gamete Transfer |
3. | Fertilization | 4. | Embryogenesis |
Assertion (A): | Dioecious organisms must have special mechanisms for gamete transfer. |
Reason (R): | In dioecious organisms, male and female gametes are formed by different individuals. |
1. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
2. | Both (A) and (R) are true and (R) correctly explains (A). |
3. | (A) is true but (R) is false. |
4. | (A) is false but (R) is true. |
Assertion (A): | Formation of the diploid zygote is universal in all sexually reproducing organisms. |
Reason (R): | Zygote is the result of syngamy where haploid gametes of opposite sex fuse to produce the diploid cell. |
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. | (A) is false but (R) is true. |
Statement I: | In organisms with external fertilisation, zygote is formed in an external medium. [usually water] |
Statement II: | In organisms with internal fertilisation, zygote is formed inside the body of the organism. |
1. | Statement I is correct, Statement II is incorrect. |
2. | Statement I is correct, Statement II is correct. |
3. | Statement I is incorrect, Statement II is correct. |
4. | Statement I is incorrect, Statement II is incorrect. |
Assertion (A): | The chances of survival of young ones are greater in viviparous organisms. |
Reason (R): | In such animals, fertilised eggs covered by a hard calcareous shell are laid in a safe place in the environment. |
1. | (A) is true but (R) is false. |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
4. | (A) is false but (R) is true. |
Statement I: | Ovules develop into seeds. |
Statement II: | Ovary develops into the fruit. |
1. | Statement I is correct, Statement II is incorrect |
2. | Statement I is correct, Statement II is correct |
3. | Statement I is incorrect, Statement II is correct |
4. | Statement I is incorrect, Statement II is incorrect |