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CBSE Sample Paper Class 7 Science Reproduction in Plants
Chapter 12
Reproduction in plants
Multiple choice questions: (marks:1×2)
1.) Flowers which contains either only pistil or only stamens are called:
A.) Unisexual flower
B.) Bisexual flower
C.) Asexual flower
Ans: Unisexual flower.
2.) Flower which contain both stamens and pistil are called:
A.) Unisexual flower
B.) Bisexual flower
C.) Asexual flower
Ans: Bisexual flower.
Fill in the blanks: (marks:1×7)
1.) …………….are the reproductive part of the plant.
Ans: Flowers.
2.) The slimy green patches in ponds are called……………..
Ans: algae.
3.) ………………are the male reproductive part of a flower.
Ans: Stamens.
4.) The female reproductive part of a flower is called……………..
Ans: Pistil.
5.) In sexual reproduction a male and a female gamete fuse to form a…………….
Ans: Zygote.
6.) …………….are the single celled organism.
Ans: Yeast.
7.) ……………..are asexual reproductive bodies.
Ans: Spores.
Match the column: (marks: 1×6)
A |
B |
Eye |
Algae |
Bud |
Potato |
Fusion |
Yeast |
Fragmentation |
Stamens |
Male reproductive part |
Female reproductive part |
Pistil |
Zygote |
Ans:
A |
B |
Eye |
Potato |
Bud |
Yeast |
Fusion |
Zygote |
Fragmentation |
Algae |
Male reproductive part |
Stamens |
Pistil |
Female reproductive part |
Answer the following questions: (marks:1×4)
1.) What is reproduction?
Ans: The production of new individuals from their parents is known as reproduction.
2.) What are the vegetative parts of a plant?
Ans: Most plants have roots, stems and leaves. These are called the vegetative parts of a plant.
3.) Which type of plant can produce new plants when their parts get detached from the main body?
Ans: Plants such as cacti produce new plants when their parts get detached from the main plant body.
4.) What is called fertilisation?
Ans: The process of fusion of male and female gametes is called fertilisation.
4.) What is seed dispersal?
Ans: In nature we see the same kind of plants grow at different places. This happens because seeds are dispersed to different places. This is called seed dispersal.
Answer the following questions: (marks:2×4)
1.) What is known as vegetative propagation?
Ans: Vegetative propagation is a type of asexual reproduction in which new plants are produced from roots, stems, leaves and buds. Since reproduction is through the vegetative parts of the plant, it is called vegetative reproduction.
2.) Write down the ways by which plants produce their offspring?
Ans: There are several ways by which plants produce their offspring. These are categorised into two types: a. asexual, and b. sexual reproduction. In asexual reproduction plants can give rise to new plants without seeds, whereas in sexual reproduction, new plants are obtained from seeds.
3.) What is spore?
Ans: Spores are asexual reproductive bodies. Each spore is covered by a hard protective coat to withstand un favourable conditions such as high temperature and low humidity. So they can survive for a long time. Under favourable conditions, a spore germinates and develops into a new individual. Plants such as moss and ferns also reproduce by means of spores.
4.) What is algae?
Ans: There are slimy green patches present in ponds, or in other stagnant water bodies. These are the algae. When water and nutrients are available algae grow and multiply rapidly by fragmentation. An alga breaks up into two or more fragments. These fragments or pieces grow into new individuals. This process continues and they cover a large area in a short period of time.
Answer the following questions: (marks: 3×1)
1.) What is pollination? Write down the types of it?
Ans: Pollen grains have a tough protective coat which prevents them from drying up. Since pollen grains are light, they can be carried by wind or water. Insects visit flowers and carry away pollen on their bodies. Some of the pollen lands on the stigma of a flower of the same kind. The transfer of pollen from the anther to the stigma of a flower is called pollination. There are mainly two types of pollination occurs:
A.) Self pollination: If the pollen lands on the stigma of the same flower or another flower of the same plant, it is called self-pollination.
B.) Cross pollination: When the pollen of a flower lands on the stigma of a flower of a different plant of the same kind, it is called cross-pollination.
Answer the following questions: (marks:1×5)
1.) Briefly write down the process of sexual reproduction in flowers?
Ans: The production of new individuals from their parents is known as reproduction. We know that the flowers are the reproductive parts of a plant. Stamens are the male
reproductive part and pistil is the female reproductive part. Flowers which contain either only pistil or only stamens are called unisexual flowers such as: Corn, papaya and cucumber produce unisexual flowers. Flowers which contain both stamens and pistil are called bisexual flowers. Such as: mustard, rose and petunia have bisexual flowers. The sexual reproduction of flower described below:
- Anther of a flower contains pollen grains which produce male gametes. A pistil consists of stigma, style and ovary. Ovary contains one or more ovules. The female gamete or the egg is formed in an ovule.
- Pollination: In sexual reproduction a male and a female gamete fuse to form a zygote. Pollen grains have a tough protective coat which prevents them from drying up. Since pollen grains are light, they can be carried by wind or water. Insects visit flowers and carry away pollen on their bodies. Some of the pollen lands on the stigma of a flower of the same kind. The transfer of pollen from the anther to the stigma of a flower is called pollination. If the pollen lands on the stigma of the same flower or another flower of the same plant, it is called self-pollination. When the pollen of a flower lands on the stigma of a flower of a different plant of the same kind, it is called cross pollination.
- Fertilisation: The cell which results after fusion of the gametes is called a zygote. The process of fusion of male and female gametes is called fertilisation. The zygote develops into an embryo.
Fruit and seed formation: After fertilisation, the ovary grows into a fruit and other parts of the flower fall off. The fruit is the ripened ovary. The seeds develop from the ovules. The seed contains an embryo enclosed in a protective seed coat. Some fruits are fleshy and juicy such as mango and orange. Some fruits are hard like almonds and walnuts.