Question

Which of the following is the first cell of human life?

• A. Oosphere
• B. 1st polar body
• C. Oospore
• D. Synkaryon

Hint:

The first cell of human life forms only after the fusion of both parental nuclei.

Answer 1

The Correct Option is D

Step 1: Understanding fertilization.
In human reproduction, fertilization involves the fusion of the male and female pronuclei. This fused nucleus is called the synkaryon and represents the first cell of human life.
Step 2: Analyzing the options.
(A) Oosphere: Incorrect. It refers to the egg cell in plants.
(B) 1st polar body: Incorrect. It is a by-product of oogenesis and does not develop into an individual.
(C) Oospore: Incorrect. Oospore is formed in plants and algae.
(D) Synkaryon: Correct. It is formed after fusion of male and female pronuclei and is the first cell of human life.
Step 3: Conclusion.
The correct answer is (D) Synkaryon.