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Biology: The Dynamic Science (Mind...
Biology: The Dynamic Science (Mind...
A student cuts off a leaflet from a plant and places it in a glass of water. Within a week roots appear on the base of the cutting. A month later she places the growing cutting into soil and it grows to the full size of the “parent” plant. This is an example of:
a. cell culture.
b. fragmentation.
c. grafting.
d. vegetative reproduction.
e. tissue culturepropagation.
Introduction:
Plants can reproduce or develop in different ways. These include sexual reproduction and asexual reproduction. Asexual reproduction by plants is also called vegetative reproduction.
Explanation/Justification for the correct answer:
Option (d) is vegetative reproduction. The growth of a plant from one of its vegetative parts, or by fragmentation, which is followed by regeneration, is vegetative reproduction or propagation. Vegetative reproduction in plants can be of various types, like grafting, layering, division, suckering, tissue culture, and cutting. In the given case, the leaflet of the plant acts as the vegetative part of the plant that helps in regeneration. This type of vegetative propagation, where a part of the plant is cut off and planted, results in the formation of a root system, and the new plant is cutting type of vegetative reproduction. Hence, option (d) is correct.
Explanation for the incorrect answers:
Option (a) is cell culture. It is a technique where the cells of the plant are grown under controlled conditions outside their natural environment. This technique is not used for regeneration. So, it is an incorrect option...
Chapter 36 Solutions
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