The heart sound 'Dup' is produced when:

1. Semilunar valves open
2. Atrio ventricular valves close
3. Semilunar valves close
4. Atrio ventricular valves open

Deplasmolysis occurs when a plasmolysed cell is placed in:

1. Concentrated salt solution
2. Tap water
3. Concentrated sugar solution
4. Hypertonic salt solution

Haploid number of chromosomes are found in:

1. Nephrons
2. Neurons
3. Skin cells
4. Sperms

The life span of an RBC is:

1. 120 days
2. 220 days
3. 20 days
4. 2 weeks