The X gene of the sex-chromosome can never pass from the

1. father to daughter
2. father to son
3. mother to daughter
4. mother to son

Most widely used plant growth hormone in agriculture is

1. auxin
2. ethylene
3. cytokinins
4. abscisic acid

During the mechanism of opening and closing of stomata, the important factor is

1. the protein content of the cells
2. the turgid and flaccid state of the guard cell
3. the starch content of the cells
4. the presence of chloroplast in the guard cell

In auricles, systole and diastole respectively last for

1. 0.3 sec and 0.5 sec
2. 0.1 sec and 0.7 sec
3. 0.2 sec and 0.6 sec
4. 0.5 sec and 0.3 sec