Cell elongation in internodal regions of the green plants takes place due to :
Correct answer: C. Gibberellins
- A. Indole acetic acid
- B. Cytokinins
- C. Gibberellins
- D. Ethylene
Explanation
(c) : Gibberellins play a role in the elongation of internodes in 'rosette' plants. Before reproductive stage there is too much elongation of internodes but there is less leaf formation. An elongated internode without leaves in called a "bolt" like structure and the process is called "bolting" flowering takes place after bolting. Gibberellins induce cell division and cell elongation, when bolting takes place.
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Embryonic development covers fertilization, cleavage, formation of the blastula and gastrula, germ layers, organ formation and differentiation. Regeneration describes the replacement of lost tissues or body parts, whereas ageing involves gradual cellular and physiological changes linked to reduced repair, altered metabolism and declining organ function.
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