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Differentiation of shoot is controlled by
Etiolated seedlings are produced by germinating seeds and keeping them in total darkness. Under which of the following conditions will plants kept in the dark-begin to synthesize chlorophyll ?
The pulse of red light converts Pr to Pfr. Subsequent pulses of far-red light stimulate changes that lead to chlorophyll synthesis.
Which of the following hormones are responsible for bud break in the spring in deciduous trees ?
Gibberellins are responsible for bud break in deciduous trees.
The potent weed killer is
Cytokinins are known to :
Less of chlorophyll and degeneration of proteins are the two important symptoms of senescence. Cytokinins delay these processes and, thus the senescence is also delayed.This effect of cytokinin is known as Richmond-Lang effect.
Which of the following hormone is concerned chiefly with root initiation?
Application of IAA, indole butyric acid, 2, 4-D, etc., to cut end of the stem stimulates root initiation in propagation of cuttings.
When a plant is not reproducing most of the cytokinins are produced in its :
The ratios of cytokinins to auxins control cell differentiation in plant tissue culture. If there is more of cytokinin than auxin shoot buds develop from a callus.If there is relatively more auxin than cytokinins roots develop.
Phototropic and geotropic movements in plants have been traced to be linked with:
The curvature induced in plant organs in response to the unidirectional light is called phototropism.
Which plant hormone promotes seed, bud dormancy and causes stomatal closure ?
Auxin regulates cell growth by
Altering the plasticity allows for permanent changes in cell wall shape. The cell wall must increase in size in order for cell growth to occur.