Concerning fertilization in hen, which statement is not correct?
Correct answer: B. Outside the albumen there is one shell membrane and hard proteinaceous calcareous membrane is present.
- A. Fertilization is internal in hen.
- B. Outside the albumen there is one shell membrane and hard proteinaceous calcareous membrane is present.
- C. The egg is laid 24 hours after the fertilization.
- D. Cleavage in hen is of discoidal type.
- E. Embryo which resembles a mulberry and becomes a rounded mass of closely packed blastomeres is MORULA.
Explanation
To clarify, there are two shell membranes outside the egg white, and the hard, calcareous shell surrounds these membranes and the rest of the egg's contents. This multi-layered structure helps protect the developing embryo and the egg's nutritional components. The hard, proteinaceous, and calcareous shell itself is the outermost layer of the egg. It provides structural support and protection for the inner contents of the egg, and it is primarily composed of calcium carbonate. In the anatomy of a chicken egg, there are two shell membranes outside the albumen (egg white), not just one. These two shell membranes serve to protect the contents of the egg and help prevent the entry of harmful microorganisms.
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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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