Question

Identify the stage which is formed after the fertilisation of the egg by the sperm ?

• A. Ovule
• B. Foetus
• C. Embryo
• D. Zygote

Answer 1

The correct option is D

Zygote

The correct option is D:

Explanation of the correct option :

Zygote-

1. It is the first diploid cell that is formed by the fusion of male and female gametes resulting in the formation of an embryo. The zygote stage development occurs in the first week of fertilization.
2. Zygote is the stage which is formed after the fertilization of the egg by the sperm.

Explanation of the incorrect option:

Option A:

1. It is the megasporangium in the flowering plants.
2. It contains an embryo sac, which is formed from the functional megaspore
3. . The ovule is attached to the placenta through a stalk known as a funicle.

Option B:

1. It refers to the final stage in baby development.
2. An embryo is termed as the foetus in the beginning in the 11th week of pregnancy.
3. In an embryo, when all parts of the body can be identified, it is termed a foetus.

Option C:

1. The embryo in humans starts to take form after four days of fertilization.
2. Initially, the solid ball of cells, a tiny mass forms – the zygote.

Final answer: Zygote is the stage which is formed after the fertilization of the egg by the sperm.