7th Grade > Biology
REPRODUCTION IN ORGANISMS MCQs
Total Questions : 118
| Page 5 of 12 pages
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Each point: 0.5 marks
1. Process of reproduction which involes two parents - a male and a female - is called sexual reproduction. Flower is the sexual reproductive part of a plant.
2.A flower has a male reproductive part called stamen and a female reproductive part called pistil.
3. Stamen has anther which produces male gametes called pollen grains. Pistil carries an ovary which produces female gametes called egg cells.
4. The pollen grainsare transferred to the femalepart of a flower bythe process of pollination.
5. Once the pollen lands on a suitable stigma, it forms the pollen tube which carries male gametes to theegg cell present inside the ovule.
6. The male gametes fuse with the egg to form the zygote and this process is called fertilization.
7. Later zygote transforms into an embryo(baby plant) while the ovule develops into the seed.
8.The seed is dispersed via different agents.
9. The seeds protect the plant embryo and on the onset of favourable conditions germinate.
10. Upon germination, the seed gives rise to a seedling.
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It is a type of asexual reproduction in plants. In this method, a new plant grows from the vegetative parts of the plant like root, stem and leaf.
Answer: Option C. -> egg
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C
The female gamete formed in an ovule is also known as the egg. The two cells,egg and sperm, fuse together during fertilisation. Thisresulting cell formed after fertilisation is called zygote.
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C
The female gamete formed in an ovule is also known as the egg. The two cells,egg and sperm, fuse together during fertilisation. Thisresulting cell formed after fertilisation is called zygote.
Answer: Option A. -> True
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A
Some plants produceseeds that are covered in hooks or spines. These seedsget attached to animals fur or feathers.They are carried upto acertain distance away from their parent plant. Later, these seeds may either fall off, or are rubbed off by the animal. In this waythe seedsare dispersed to a new surrounding where they germinate.
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A
Some plants produceseeds that are covered in hooks or spines. These seedsget attached to animals fur or feathers.They are carried upto acertain distance away from their parent plant. Later, these seeds may either fall off, or are rubbed off by the animal. In this waythe seedsare dispersed to a new surrounding where they germinate.
Answer: Option B. -> different plants of the same species
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B
The transfer of pollen grains from anther to stigma of different flower of different plant of the same species is called cross pollination. Fertilisation takes place only if pollinationtakes place between plants of the same species.
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B
The transfer of pollen grains from anther to stigma of different flower of different plant of the same species is called cross pollination. Fertilisation takes place only if pollinationtakes place between plants of the same species.
Answer: Option D. -> Vegetative propagation
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D
The mode of reproduction inpotatoes, ginger and turmeric is vegetative propagation from the nodes.Vegetative propagation is a type of asexual reproduction in which new plants are produced fromthe vegetative parts like stems, roots and leaves.
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D
The mode of reproduction inpotatoes, ginger and turmeric is vegetative propagation from the nodes.Vegetative propagation is a type of asexual reproduction in which new plants are produced fromthe vegetative parts like stems, roots and leaves.
Answer: Option C. -> water
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C
Different types of seeds have different ways of dispersal depending upon their characteristics.
The seeds which have spongy or fibrous outer coat are generally dispersed by water. The spongy surface allows them to float on the water. E.g., Coconut.
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C
Different types of seeds have different ways of dispersal depending upon their characteristics.
The seeds which have spongy or fibrous outer coat are generally dispersed by water. The spongy surface allows them to float on the water. E.g., Coconut.
Answer: Option A. -> True
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A
Seeds from plants such as Swanand Cottonwood trees are light and have feathery bristles. They can be easily carried away to long distanceby the wind. On the other hand, some plantslike Kauri and Maple treeshave ‘winged’ seeds. These seeds don’t float away but flutter to the ground and is also an example of wind dispersal. Hencethe statement is correct.
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A
Seeds from plants such as Swanand Cottonwood trees are light and have feathery bristles. They can be easily carried away to long distanceby the wind. On the other hand, some plantslike Kauri and Maple treeshave ‘winged’ seeds. These seeds don’t float away but flutter to the ground and is also an example of wind dispersal. Hencethe statement is correct.
Answer: Option B. -> embryo
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B
The seed contains an embryo enclosed within a protective coat. Seeds are developed from ovules after fertlisation. The zygote within the ovule develops into an embryo. When the seeds germinate, these embryos grow out into new plantlets.
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B
The seed contains an embryo enclosed within a protective coat. Seeds are developed from ovules after fertlisation. The zygote within the ovule develops into an embryo. When the seeds germinate, these embryos grow out into new plantlets.
Answer: Option B. -> Stem
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B
Vegetative propagationis a type ofasexualreproductioninplants. A part ofplant except flower is involved in vegetative propagation, for example stem, leaves etc. The offsprings are identical to the parent plant.Unlike flowers, the buds in axil are vegetative buds andhelp in vegetative propagation.
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B
Vegetative propagationis a type ofasexualreproductioninplants. A part ofplant except flower is involved in vegetative propagation, for example stem, leaves etc. The offsprings are identical to the parent plant.Unlike flowers, the buds in axil are vegetative buds andhelp in vegetative propagation.
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