Question

Reserve food in amphibians microlecithal or macrolecithal

Answer 1

Eggs Present in the Ovum: Microlecithal, Mesolecithal and Macrolecithal Eggs

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Three Types of Egg present in the Ovum are as follows:

According to the proportion of the yolk to the cytoplasm of the ovum there are three types of egg:

[I] Microlecithal egg:

In microlecithal eggs the amount of yolk is much less than the amount of cytoplasm. These eggs are very small in size.

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Some embryologists described microlecithal eggs as alecithal eggs or oligolecithal eggs or miolecithal (i.e. little yolk) eggs.

The eggs of Amphioxus, marsupials and eutherian mammals are of this type. The mammalian eggs contain so little yolk that they are sometimes called alecithal (without yolk) eggs.


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[II] Mesolecithal eggs:

Here yolk is moderate in amount and such eggs are called mesolecithal or medialecithal (i.e. median yolk). The distribution of yolk is distinctly unequal. The eggs of sharks, ganoid fishes, dipnoi and many amphibians are of this type.

[III] Macrolecithal or polylecithal eggs:

Enormous amount of yolk is present in macrolecithal eggs and here yolk is several times greater than cytoplasm. These eggs may be small or big. The eggs of teleost fishes, gymnophiona (legless amphibians), reptiles, birds and monotremates (egg laying mammals)
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