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प्रश्न
The height of a plant is regulated by ______.
विकल्प
DNA is directly influenced by growth hormones.
Genes which regulate the proteins directly.
Growth hormones are under the influence of the enzymes coded by a gene.
Growth hormones are directly under the influence of a gene.
उत्तर
The height of a plant is regulated by Growth hormones under the influence of the enzymes coded by a gene.
Explanation:
Under the control of the enzymes that the gene codes for, growth hormones control the plant's height. The amount of growth hormones a plant produces is dependent on the effectiveness of the relevant enzyme. Effective enzymes generate more of the hormone, which causes the plant to grow taller. However, if the enzymes are less effective, less hormone is released, which causes the plant to become stunted.
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संबंधित प्रश्न
What is a tendril?
Define chemotropism.
Give one example of a plant part which is positively hydrotropic as well as positively geotropic.
The growth of a pollen tube towards the ovule caused by a sugary substance as stimulus is an example of :
(a) phototropism
(b) chlorotropism
(c) gravitropism
(d) chemotropism
One of the following is not caused by the growth related movement of the concerned plant part. This is:
The bending of the root of a plant away from a source of light is caused by a plant hormone called :
(a) cytokinin
(b) gibberellin
(c) abscisic acid
(d) auxin
Differentiate between:
Phototropism and chemotropism
How is movement in plants different from that in animals?
Give the scientific term for the following:
Growth-dependent movement in plants.
Give an example of negative hydrotropism.
