Choose the correct answer from each of the four options given below:

Choose the correct answer from each of the four options given below:

(i) The number of Spinal nerves in a human being are:

1. 31 pairs
2. 10 pairs
3. 21 pairs
4. 30 pairs

(ii) Which one of the following is non-biodegradable?

1. DDT
2. Vegetable peel
3. Cardboard
4. Bark of trees

(iii) Aqueous humour is present between the:

1. Lens and Retina
2. Iris and Lens
3. Cornea and Iris
4. Cornea and Lens

(iv) A strong chemical substance which is used on objects and surfaces in our surroundings to kill germs:

1. Cresol
2. Carbolic acid
3. Iodine
4. Mercurochrome

(v) Which one of the following is a Greenhouse gas?