Question

Human egg is
A. Telocithal
B. Megalecithal
C. Alecithal
D. Centrolecithal

Answer 1

In the process of sexual reproduction, the male gamete is produced by the males and the female produces the female gamete which is known as the ovum or the egg.

Complete Solution:
In humans, during the process of sexual reproduction, the gametes produced by both the male and female are haploid units. The male sex cell or the male gamete is known as the sperm while the female gamete is known as the egg or the ovum. The male sperm cells are motile in nature due to the presence of a tail while the ovum or the egg is non-motile as it is incapable of movement. During the process of fertilization, the sperm fuses with the stationary ovum to give rise to a zygote. The zygote is the fertilised egg.

In females, the ovum grows from primitive germ cells and is fertilised inside the body. The ovum arises from the germ cells that are present in the layers of the ovaries. Each of the germ cells divide progressively to give rise to a mature ovum by formation of a blastocyst.

The ooplasm is the yolk of the ovum. The yolk or the ooplasm is present at the centre of the oocyte. The ooplasm consists of cytoplasm like any other cells but it also contains spongioplasm and hyaloplasm. The spongioplasm and hyaloplasm are together referred to as the formative yolk. The other part of the yolk is the nutrition providing part which is also known as the deutoplasm or the nutritive yolk. This part is made up of round granules of fatty acid and albuminoidal substances which are present in the cytoplasm.

The mammalian ovum or egg contains a very tiny amount of the nutritive yolk and it is called an alecithal type of egg. The nutritive yolk is very little in amount and can be used to nourish the embryo only in the early developmental stages. The egg in later stages of development attaches to the inner layer of the uterus where it develops a connection with the mother’s blood to receive nutrition required for further development.
Hence, the most correct option is C.

Note: The eggs in humans are known as ovum and are alecithal because they contain very less amount of yolk. The amount of yolk is very little and it is used up during the early developmental stages.