In one of the industrial processes used for manufacture of sodium hydroxide, a gas ‘X’ is formed as a by-product. The gas ‘X’ reacts with lime water to give a compound ‘Y’ which is used as a bleaching agent in the chemical industry. Identify ‘X’ and ‘Y.

• A.) X is chlorine; Y is baking soda
• B.) X is chlorine; Y is bleaching powder
• C.) X is hydrogen; Y is potash
• D.) X is hydrogen; Y is plaster of Paris

Which of the following is a micronutrient?

• A) Mg
• B) Zn/Cu
• C) Ca
• D) P

Which one of the following is non-biodegradable?

• a. DDT
• b. Vegetable peel
• c. Cardboard
• d. Bark of trees.

With the help of labelled diagrams explain the human male reproductive system.

Which of the following actions are reflex actions?

• I. Movement of the diaphragm during respiration
• II. Coughing
• III. Yawning
• IV. Sneezing
• V. Removal of hand on being touched by hot object

A. II and V only

B. III, IV and V only

C. IV and V only

D. I, II, III, IV and V

Which day is observed as the World environment day?

• A. 21 May
• B. 5 June
• C. 25 September
• D. 13 December