Question

57. Blastodisc is found in the
(A) Centrolecithal eggs
(B) Mesolecithal eggs
(C) Telolecithal eggs
(D) Discoidal eggs​

Answer 1

Answer:

This type of cleavage occurs in polylecithal and centrolecithal eggs, where there is a clear patch of yolk free cytoplasm. This patch is called the blastodisc. The first two or three cleavage furrows cut the blastodisc vertically but they do not reach the bottom of the blastodisc. The blastodisc is found at the top of the yolk mass. E.g. Reptiles and Birds. According to the presence/absence of shell Cleidoic (box-like): These eggs are laid on dry land, self contained, fully laden with yolk and surrounded by albumin and a waterproof shell. E.g Reptiles and Birds.

Explanation:

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Answer 2

Option D is the correct answer.

• An egg that retains an enormous percentage of yolk, where the yolk is unevenly conveyed all through the cytoplasm is concerned to as a telolecithal egg. The yolk in this assortment of eggs is centralized following the vegetal pole. Animals that lay telolecithal eggs are birds and reptiles.
• The eggs that retain their yolk directed in the centre of the shell belong to centrolecithal eggs. They acquire a tiny sheet of cytoplasm garnishing the yolk. Arthropoda creatures plop centrolecithal eggs.
• Mesolecithal eggs possess comparatively excess yolk than microlecithal eggs.
• In a discoidal egg, the abundance of the yolk is enormous and seizes the critical fraction except for a small disc-shaped area of cytoplasm nominated as the Blastodisc. The blastodisc is organized at the primary of the yolk mass.

Hence, option D is the correct answer.

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