Class 7 Reproduction in Plants
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POINTS TO REMEMBER.
• The production of new individuals from parents is called reproduction.
• In asexual reproduction, the new individuals are produced by a single parent, e.g., yeast, cane sugar, hydra etc.
• In sexual reproduction, two parents are needed to produce new individuals e.g., humans, dogs, frog etc.
• Asexual reproduction of organisms can take place by the following means: fission, budding, fragmentation, spore formation.
• In vegetative propagation, a portion of the plant body is detached and developed into an independent individual. Vegetative propagation can take place by roots, stems and leaves.
• Flowers are sexual reproductive structures of higher plants.
• Pollination is a transfer of pollen grains from the anther to a stigma of a plant of the same species.
• Pollination is of two types: self-pollination and cross-pollination.
• Pollination occurs with the help of three methods: 1. insect pollination; 2. wind pollination; 3. water pollination.
• The embryo of a seed has tiny root (radicle), small shoot (plumule) and one or two embryonic leaves (cotyledons). In many seeds, cotyledons have food stored in them.
• Wall of the ovary (or fertilised egg) forms food.
Reproduction in Plants
Match the following:
Column I Column II
- Bud (a) Maple
- Eyes (b) Spirogyra
- Fragmentation (c) Yeast
- Wings (d) Bread Mould
- Cutting (e) Potato
- Spores (f) Rose
1.— (c), 2 — (e), 3— (b), 4 — (a), 5 — (f), 6 — (d).
Very Short Answer Question
- Name one plant which can be reproduced through stem cuttings.
- Name one organism which reproduces by budding.
- Which asexual reproduction takes place in yeast?
- Which asexual mode of reproduction takes place in bread mould?
- Name the male part of a flower?
- Name the female part of a flower?
- Name two plants having hairy seeds or fruits which are dispersed by the wind.
- Which part of a flower contains:
(a) pollen, and (b) ovules?
9. Which part of a flower forms the fruit?
- By spores
- Stamen is the male reproductive organ of the flower.
- The pistil is the female reproductive organ of the flower.
- Seeds of madder and sunflower have hair.
- (a) Stamen and (b) Pistil
- The stigma and the style