Q. No.Given below are a few statements related to external fertilization. Choose the correct statements.
i.
The male and female gametes are formed and released simultaneously.
ii.
Only a few gametes are released into the medium.
iii.
Water is the medium in a majority of organisms exhibiting external fertilization.
iv.
Offspring formed as a result of external fertilization have a better chance of survival than those formed inside an organism.
1.
iii and iv
2.
i and iii
3.
ii and iv
4.
i and iv
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The statements given below describe certain features that are observed in the pistil of flowers.
i. Pistil may produce more than one seed.
ii. Each carpel may have more than one ovule.
iii. Each carpel has only one ovule.
iv. Pistil has only one carpel.
Choose the statements that are true from the options below:
| 1. | i and ii | 2. | i and iii |
| 3. | ii and iv | 4. | iii and iv |
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Which of the following situations correctly describes the similarity between an angiosperm egg and a human egg?
| 1. | Eggs of both are formed only once in a lifetime |
| 2. | Both the angiosperm egg and human egg are stationary |
| 3. | Both the angiosperm egg and human egg are mobile |
| 4. | Syngamy in both results in the formation of zygote |
Choose the correct answer from the options given below:
| 1. | ii and iv | 2. | iv only |
| 3. | iii and iv | 4. | i and iv |
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Choose the correct statement from the following:
| 1. | Dioecious (hermaphrodite) organisms are seen only in animals. |
| 2. | Dioecious organisms are seen only in plants. |
| 3. | Dioecious organisms are seen in both plants and animals. |
| 4. | Dioecious organisms are seen only in vertebrates. |
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There is no natural death in single-celled organisms like Amoeba and bacteria because:
1. They cannot reproduce sexually
2. They reproduce by binary fission
3. Parental body is distributed among the offspring
4. They are microscopic
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Which of the following is a post-fertilisation event in flowering plants?
1. Transfer of pollen grains
2. Embryo development
3. Formation of flower
4. Formation of pollen grains
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The number of chromosomes in the shoot-tip cells of a maize plant is 20. The number of chromosomes in the microspore mother cells of the same plant shall be:
1. 20
2. 10
3. 40
4. 15
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The process of sexual reproduction which involves meiosis and syngamy is:
| 1. | Apomixis | 2. | Amphimixis |
| 3. | Agamospermy | 4. | Diplospory |
Grafting is not successful in monocots but is successful in dicots because they have:
1. Vascular bundles arranged in a ring
2. Cambium for secondary growth
3. Vessels with elements arranged end to end
4. Cork cambium
A scion is grafted on a stock. The quality of fruits produced will depend upon the genotype of:
1. Scion
2. Stock
3. Both 1. and 2.
4. None of the above
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