Q. No.Organisms relying completely on external fertilization are almost always likely to be found in:
1. Tropical forests
2. Moist environments
3. Aquatic habitats
4. Dry, arid conditions
1. Tropical forests
2. Moist environments
3. Aquatic habitats
4. Dry, arid conditions
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In the given diagrams each part A, B, C and D shows a reproductive structure in an organism marked as ‘X’. Select the option where all parts are correctly matched:
|
A. |
 |
B. |  |
|
B. |
 |
D. |  |
| 1. | A: Oogonium of Chara; B: Archegoniophore of Marchantia; C: Conidia of Penicillium; D: Offset of Eicchornia |
| 2. | A: Antheridium of Chara; B: Antheridiophore of Marchantia; C: Sporangiophores of Penicillium; D: Offset of Eicchornia |
| 3. | A: Oogonium of Chara; B: Antheridiophore of Marchantia; C: Conidia of Penicillium; D: Offset of Eicchornia |
| 4. | A: Antheridium of Chara; B: Archegoniophore of Marchantia; C: Conidia of Penicillium; D: Stolon of Eicchornia |
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In animals exhibiting internal fertilization:
| 1. | the number of sperms produced is significantly reduced |
| 2. | a large number of offspring are produced per reproductive event |
| 3. | offspring are extremely vulnerable to predators |
| 4. | the chance of individual egg fertilization is high |
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Consider the following statements:
| I: | Meiosis never occurs in organisms that are haploid |
| II: | Gametes are haploid and the parent plant body from which they arise must be diploid |
1. Only I is correct
2. Only II is correct
3. Both I and II are incorrect
4. Both I and II are correct
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Identify the incorrectly matched pair:
1. Cockroach - Unisexual animal
2. Chara - Monoecious plant
3. Marchantia - Dioecious plant
4. Sweet potato - Unisexual flower
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A flower that produces only pollens is called as:
| 1. | Perfect flower | 2. | Staminode |
| 3. | Dioecious | 4. | Staminate |
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A plant with both male flowers and female flowers is called as:
| 1. | Unisexual | 2. | Bisexual |
| 3. | Dioecious | 4. | Monoecious |
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Which of the following is not always true for sexual mode of reproduction?
I. Separate sexes in the species
II. Gamete formation
III. Fertilization
| 1. | Only I | 2. | Only III |
| 3. | Both I and III | 4. | Both II and III |
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Consider the two statements:
| I: | Lifespan of living organisms are correlated with their body size |
| II: | Almost always, larger the body size more will be the lifespan |
1. Both I and II are correct and II explains I.
2. Both I and II are correct but II does not explain I.
3. I is correct and II is incorrect.
4. Both I and II are incorrect.
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A prominent Indian botanist noted chiefly for his invention of the technique of test-tube fertilization of angiosperms is:
| 1. | Panchanan Maheshwari | 2. | M. S. Swaminathan |
| 3. | Gurdev Khush | 4. | Y. Subbarow |
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