Which of the following meristems is responsible for extra-stelar secondary growth in the dicotyledonous stem?
Correct answer: C. Phellogen
- A. Interfascicular cambium
- B. Intercalary meristem
- C. Phellogen
- D. Intrafascicular cambium
Explanation
Extrastelar secondary growth means growth in the cortical region, external to stele. For extrastelar secondary growth, the cork cambium or phellogen develops in the region outside the vascular tissue. This gives rise to cork or phellem and secondary cortex or phelloderm. All three layers (i.e., cork, cork cambium, and secondary cortex) together constitute periderm. Fascicular and interfascicular cambuim occurs in the stelar regions.
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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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