Choose the correct answer from the options given below:

Choose the correct answer from the options given below:

(i) Cretinism and Myxoedema are due to

1. Hypersecretion of thyroxin
2. Hypersecretion of growth hormone
3. Hyposecretion of thyroxin
4. Hyposecretion of growth hormone

(ii) Which of the following is not a natural reflex action?

1. Knee-jerk
2. Blinking of eyes due to strong light
3. Salivation at the sight of food
4. Sneezing when any irritant enters the nose

(iii) After mitotic cell division, a female human cell will have

1. 44 + xx chromosomes
2. 44 + xy chromosomes
3. 22 + x chromosomes
4. 22 + y chromosomes

(iv) The antibiotic penicillin is obtained from

1. Protozoan
2. Bacteria
3. Virus
4. Fungus

(v) The site of maturation of human sperms is the