The marginal cells of blastoderm lie unseparated from the yolk and form the zone of junction with central region:
Correct answer: A. Area - opaca
- A. Area - opaca
- B. Area pellucida
- C. Area - phellogen
- D. Both A and B
- E. None of these
Explanation
Peripheral part of the blastoderm where the cells lie unseparated from the yolk is termed as area opaca.
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About Growth and Development
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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