Which of the following is a plant hormone?
(a) Insulin (b) Thyroxin (c) Oestrogen (d) Cytokinin.
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Grapes hanging on the plant do not ferment but after being plucked from the plant can be fermented.
Grapes when attached to the plants are living and therefore their own immune system prevents fermentation. The microbes can grow in the plucked grapes and under anaerobic conditions these can...
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Leaves of a healthy potted plant were coated with vaseline. Will this plant remain healthy for long? Give reasons for your answer.
The plant will not remain healthy for long and it will die. Vaseline is thick and it will block the stomata so there will be no intake of carbon dioxide. It will...
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Give an example of a plant hormone that promotes growth.
Examples of plants growth hormones: Gibberellins help in the growth of the stem. Auxins help in the growth of the stem. Cytokinins promote cell division.
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A cross between a tall plant (TT) and short pea plant (tt) resulted in progeny that were all tall plants because
(a) tallness is the dominant trait
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Which kind of plastid is more common in (a) roots of the plant (b) leaves of the plant (c) flowers and fruits
Hint—(a) Leucoplast (b) Chloroplast (c) Chromoplast
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How is a mature, functional insulin hormone different from its pro-hormone form?
Mature functional insulin is obtained by processing of pro-hormone which contains extra peptide called C-peptide. This C-peptide is removed during maturation of proinsulin to insulin.
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Name the human male reproductive organ that produces sperms and also secretes a hormone. Write the functions of the secreted hormone.
(a) Testes produce sperms and secrete a hormone called testosterone. The function of testosterone is to control the development of male sex organs and secondary sexual features. (b) (i) Oviduct or fallopian tubes...
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Name a plant hormone that promotes growth. How do these hormones bring about phototropism in the shoot of a plant ?
Auxins promote growth of plants. When light falls on one side of the plant, auxins diffuse towards shady side of the shoot. This concentration of auxin stimulates the cells to grow...
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A gland secretes a particular hormone. The deficiency of this hormone in the body causes
(i) Pancreas is the name of the gland and the hormone secreted is insulin. (ii) Insulin helps in regulating blood sugar levels. (iii) Deficiency of insulin cause diabetes.
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Name a hormone secreted by : (i) Pancreas (ii) Pituitary (iii) Thyroid State one function of each of the hormone.
(i) Pancreas secretes hormone insulin. It helps in regulating the sugar level in blood. (ii) Pituitary secretes growth hormone. It regulates growth and development of the body. (iii) Thyroid secretes thyroxine hormone....
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