Q. No.Appearance of vegetative propagules from the nodes of plants such as sugarcane and ginger is mainly because:
1.
Nodes are shorter than internodes
2.
Nodes have meristematic cells
3.
Nodes are located near the soil
4.
Nodes have non-photosynthetic cells
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Which of the following statements supports the view that elaborate sexual reproductive processes appeared much later in organic evolution?
| i. | Lower groups of organisms have a simpler body design |
| ii. | Asexual reproduction is common in lower groups |
| iii. | Asexual reproduction is common in higher groups of organisms |
| iv. | The high incidence of sexual reproduction in angiosperms and vertebrates |
| 1. | i, ii, and iii | 2. | i, iii, and iv |
| 3. | i, ii, and iv | 4. | ii, iii, and iv |
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Offspring formed by sexual reproduction exhibit more variation than those formed by Asexual reproduction because:
| 1. | Sexual reproduction is a lengthy process |
| 2. | Gametes of parents have a qualitatively different genetic composition |
| 3. | Genetic material comes from parents of two different species |
| 4. | Greater amount of DNA is involved in sexual reproduction |
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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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There are various types of reproduction. The type of reproduction adopted by an organism depends on:
| 1. | The habitat and morphology of the organism |
| 2. | Morphology of the organism |
| 3. | Morphology and physiology of the organism |
| 4. | The organism’s habitat, physiology, and genetic makeup |
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Identify the incorrect statement :
| 1. | In asexual reproduction, the offspring produced are morphologically and genetically identical to the parent |
| 2. | Zoospores are sexual reproductive structures |
| 3. | In asexual reproduction, a single parent produces offspring with or without the formation of gametes |
| 4. | Conidia are asexual structures in Penicillium |
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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 product of sexual reproduction generally generates:
1. Large biomass
2. Longer viability of seeds
3. Prolonged dormancy
4. New genetic combinations leading to variations
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