Tag: growth and development
Questions Related to growth and development
Decapitation i.e. removal of shoot tips in a plant usually results in
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inactivation of lateral buds
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growth of lateral buds
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cessation of plant growth
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yellowing of leaves.
Growth hormone responsible for apical dominance is
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Auxin
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Cytokinin
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Gibberellin
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Ethylene
Apical dominance is a phenomenon in which central stem is dominant and lateral stems are suppressed. It is due to plant hormones produced in the tip of the shoot. Auxin hormone is responsible for apical dominance and cytokinin hormone is responsible for breaking the apical dominance.
Substances which originate at the tip of stem and control growth elsewhere are
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Enzymes
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Hormones
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Vitamins
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None of the above
A chemical substance produced in one part of body and regulates the activity of other parts is called as hormones. Plant hormones are produced in the stem, bud and root tips and control the plant growth, formation of flowers, stems, leaves, development, and ripening of fruit, etc. Auxins are specialized hormones which acts on the tip.
Apical dominance means
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Suppression of growth of apical bud by axillary buds
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Suppression of growth of axillary buds by the presence of apical buds
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Stimulation of growth of axillary buds by removal of apical buds
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Inhibition of growth of axillary buds by removal of apical buds
Auxins are generally produced by the growing apices of the stems and roots, from where they migrate to the regions of their action. In most higher plants, the growing apical bud inhibits the growth of the lateral (axillary) buds, a phenomenon called as apical dominance.
Vernalization can remove Kernel wrinkles in:
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Wheat
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Petkus rye
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Maize
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Rice
- Vernalisation is defined as the qualitative or quantitative dependence of plants on exposure to a low temperature to flower. Temperature affects flowering, metabolic activities, and germination of seeds in plants. Plants that grow in mild weather germinate at low temperatures whereas those that grow in hot regions germinate at high temperatures.
- Some plants need exposure to a low temperature to germinate. Furthermore, a plant can be induced to flower in a growing season by exposing it to low temperature. Therefore, it shortens the vegetative phase and hastens flowering in plants.
Vernalization is subjected to plants growing in
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Tropical areas
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Sub tropical
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Temperate areas
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Hot areas/Arctic region
Which of the following is not true regarding vernalisation
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Its a temperature dependent phenomenon
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Its a light dependent phenomenon
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It prevents precocious reproductive development
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Its an aerobic process
The process of induction of flowering in plants, by exposing seeds at low temperature for prolonged periods is called Vernalisation. It is an aerobic, temperature dependent phenomena, prevents precocious reproductive development. It does not depend on light.
So, the correct answer to the question is ‘vernalisation is not a light dependent phenomena’.
Vernalization is a phenomenon which concerns
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Low temperature requirement for flowering in plants
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Migration of birds from their winter homes to summer habitats
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Immunization of infants against the common infectious diseases
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Entering of cold blooded animals into an inactive state in winter
Vernalization is the acquisition of a plant's ability to flower in the spring by exposure to the prolonged cold of winter, or by an artificial equivalent. Many plants grown in temperate climates require vernalization and must experience a period of low winter temperature to initiate or accelerate the flowering process. This ensures that reproductive development and seed production occurs in spring and summer, rather than in autumn.
Chemical agent that has important role in flowering is
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Fluorocarbon
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GA${ _3}$
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Florigen
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Auxins
What is vernalisation?
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Growth curve in response to light
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Recurrence of day and night
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Effect of day length on plant growth
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Acceleration of the ability to flower by low temperature treatment
Vernalization is the process of induction of flower by prolonged exposure to cold temperature. It is an adaptation shown by plants which are exposed to harsh winter followed by relatively short growing seasons. Vernalization is practiced artificially too.