Meristematic tissue responsible for increase in girth of tree trunk is
Correct answer: B. Lateral meristem
- A. Intercalary meristem
- B. Lateral meristem
- C. Phellogen
- D. Apical meristem
Explanation
(b): Lateral meristems are the meristems which are present along the lateral sides of stem and roots. They divide only in radial direction. Intrastelar or vascular cambium ring formed by intrafascicular (also called fascicular) and interfascicular cambium; and cork cambium (phellogen) are examples of this type of meristem. These meristems are responsible for increase in girth of stem and roots.
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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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