Q. No.In several simple plants like algae, bryophytes, and pteridophytes, water is the medium through which gamete transfer takes place. To increase the chances of fertilization, such plants:
1.
Produce a large number of female gametes that are non-motile
2.
Produce a large number of male gametes that is several thousand times the number of female gametes produced
3.
Produce a large number of female gametes that is several thousand times the number of male gametes produced
4.
Do not have the capability of reproducing asexually
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A reproductive strategy that involves the development of a female (rarely a male) gamete (sex cell) without fertilization is called:
| 1. | Parthenogenesis | 2. | Parthenocarpy |
| 3. | Panmixis | 4. | Amphimixis |
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Consider the two statements:
| I: | Organisms exhibiting external fertilisation show great synchrony between the sexes. |
| II: | Such organisms release a large number of gametes into the surrounding medium (water). |
| 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 but II is incorrect. |
| 4. | Both I and II are incorrect. |
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A major disadvantage of external fertilization is:
| 1. | Lack of variation in the progeny |
| 2. | The number of progeny produced can only be one or few |
| 3. | The offspring are extremely vulnerable to predators threatening their survival up to adulthood |
| 4. | The progeny have a very short life span and a low reproductive potential |
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When compared to external fertilization, in cases where internal fertilization takes place in sexually reproducing organisms:
| 1. | The progeny are afforded better protection |
| 2. | The number of male gametes are highly reduced while the number of female gametes is increased |
| 3. | Male gamete is non-motile and the female gamete has to reach it |
| 4. | In seed plants the non-motile male gametes are carried to the female gamete by pollen tubes |
Identify the correct statements from the options given below :
| I. | Only I and II are correct |
| II. | Only III and IV are correct |
| III. | Only I and IV are correct |
| IV. | Only II and III are correct |
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What is the most important feature that enabled reptiles, birds, and mammals to become highly successful on land when compared to amphibians?
| 1. | Respiration by lungs | 2. | Calcareous eggs |
| 3. | Amnion | 4. | Scaly skin |
Identify the incorrectly matched pair:
|
|
Organism |
Chromosome number in a meiocyte |
|
1. |
Ophioglossum |
630 |
|
2. |
Housefly |
12 |
|
3. |
Maize |
20 |
|
4. |
Butterfly |
380 |
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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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