GROWTH DEVELOPMENT CHILD
GROWTH AND DEVELOPMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Gibberelins
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Etiolation
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Tropism
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Cytokins
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Detailed explanation-1: -Based on several lines of evidence, including the rapid growth response during gravitropism and phototropism, auxin is also a major factor controlling internode elongation (Cleland, 2010).
Detailed explanation-2: -Plants of the Tall stock overproduce the plant growth regulator gibberellic acid, resulting in the elongation of the hypocotyl and stem internodes (lengths between leaf bracts). This phenotype is first apparent 2-3 days after germination when the seedling hypocotyl continues to extend beyond the standard.
Detailed explanation-3: -GAs act as regulators (hormones) of developmental processes such as stem elongation, fruit and seed development, seed germination and dormancy. The most studied role of GAs is the control of internode elongation in stems.
Detailed explanation-4: -Gibberellins stimulate cell elongation by altering the rheological properties of the cell wall; as a consequence, the water potential of the cell is lowered allowing for water uptake and therefore an increase in cell volume.