Q. No.A multicellular, filamentous alga exhibits a type of sexual life cycle in which the meiotic division occurs after the formation of zygote. The adult filament of this alga has
1. haploid vegetative cells and diploid gametangia
2. diploid vegetative cells and diploid gametangia
3. diploid vegetative cells and haploid gametangia
4. haploid vegetative cells and haploid gametangia
The male gametes of 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 fertilisation.
| 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 fertilisation. |
| IV. | Offspring formed as a result of external fertilisation have better chances of survival than those formed inside an organism. |
Choose the correct statements.
1. lll and lV
2. l and lll
3. ll and lV
4. l and lV
Which of the following situations correctly describe the similarity between an angiospermic egg and a human egg?
| I. | Eggs of both are formed only once in a lifetime. |
| II. | Both the angiosperm egg and human egg are stationary. |
| III. | Both the angiosperm egg and human egg are motile transported. |
| IV. | Syngamy in both results in the formation of zygote. |
Choose the correct answer from the options given below.
1. ll and lV
2. only lV
3. lll and lV
4. l and lV
Q.10 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
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 amongst 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 invertebrates.
There is no natural death in single-celled organisms like Amoeba and bacteria because
1. they can't 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
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 produces offspring with or without the formation of gametes.
4. Conidia are asexual structures in Penicillium.
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