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Biology, Chapter 16- Reproduction, Asexual Reproduction, Asexual…
Biology, Chapter 16- Reproduction, Asexual Reproduction
Asexual reproduction:
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In more complex organisms, a part of the organism may grow into a whole new individual. For example, a stem planted in the soil may develop roots and leaves and become a whole new plant.
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Bryophyllum:
Bryophyllum produces plantlets from and on the leaf margins. When they fall on the soil below, they grow into new independent plants.
Stolons:
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Once the main shoot has flowered, the lateral buds produce horizontal shoots which are called stolons or runners.
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At each node, there is a bud which can produce a shoot and roots as well.
For a while, the parent plant supplies the daughter plant with nutrients through the stolon. It eventually dries up, and new daughter plants are formed around the parent plant.
Rhizomes
Couch grass has an underground rhizome, which are horizontal stems.
Buds develop, which may produce shoots above the ground.
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Bulbs:
Bulbs like those of daffodil and lily are very short shoots. Leaves develop around the stem are thick and fleshy with stored food.
In spring, the stored food is rapidly used up by the terminal bud. It produces a flowering stalk and some leaves.
During the growth season, food made in the leaves is sent to the leaf base and stored.
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Some food is also sent to the lateral bud inside the parent bulb, which grows to produce an independent plant.
Corms:
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These rhizomes swell up with starch and form tubers. Since these tubers are stems, they have buds.
If these tubers are left underground, they will produce shoots using the food stored. In this way, the plant reproduces asexually.
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