The male gametes of a rice plant have 12 chromosomes in their nucleus. The chromosome number in the female gamete, zygote, and the cells of the seedling will be, respectively:
1.
12, 24, 12
2.
24, 12, 12
3.
12, 24, 24
4.
24, 12, 24
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 |
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 |
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 |
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 |
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 |
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 |
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. |
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
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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