A newly married couple are expecting their first child. What is the probability of them having a daughter?

1. 10%
2. 50%
3. 75%
4. 100%

Assertion (A): Veins starting from the intestines do not open directly into the inferior vena cava.

Reason (R): They unite and enter the liver as hepatic portal vein.

1. (A) is true and (R) is false.
2. (A) is false and (R) is true.
3. Both (A) and (R) are true.
4. Both (A) and (R) are false.

The number of chromosomes in the somatic cells of a human body before mitosis and after mitosis is:

1. 23, 23
2. 26, 46
3. 23, 46
4. 46, 46

The inorganic constituent of urine is:

1. Ammonia
2. Urea
3. Creatinine
4. Uric acid