Question

Human egg is

• A. Megalecithal
• B. Telolecithal
• C. Alecithal
• D. Centrolecithal

Answer 1

The correct option is C

Alecithal

The correct option is C.

Explanation of the correct option:

Option C:

1. Alecithal eggs are eggs with very little to no yolk at all.
2. Hence, the human egg is very small in size as it does not contain any yolk.
3. Yolk provides necessary nutrition for the growth of the developing embryo.

Explanations of incorrect options:

Option A:

1. Megalecithal eggs are eggs which have a large amount of yolk.
2. The yolk of the egg is greater than the cytoplasm of the cell.
3. Examples of megalecithal eggs are reptiles and mammals, etc.

Option B:

1. Telolecithal eggs are eggs with their yolk located at the one end of a vegetative pole.
2. The telolecithal eggs can form a meroblastic cleavage, meaning the cytoplasmic divisions of the cell may get confined to a particular pole, hence leading to a disc of cells getting restricted at the pole or top of the yolk.
3. Examples of telolecithal eggs are amphibians birds, fishes, etc.

Option D:

1. Centrolecithal eggs are the eggs that have the yolk at the center of the cytoplasm.
2. The egg yolk has too much volume and it is elongated.
3. Examples of centrolecithal eggs are arthropods, some coelenterates, insects, etc.

Final answer: Human egg is Alecithal.