>1. Which one of the following processes in the bodies of living organisms is a digestive process?
(a) Breakdown of proteins into amino acids
(b) Breakdown of glucose into CO2 and H2O.
(c) Conversion of glucose into glycogen.
(d) Conversion of amino acids into proteins.
Ans: (a)
2. Excessive release of the pollutant carbon monoxide (CO), into the air may produce a condition in which oxygen supply in the human body decreases. What causes this condition?
(a) When inhaled into the human body, CO is converted into CO2.
(b) The inhaled CO has much higher affinity for haemoglobin as compared to oxygen.
(c) The inhaled CO destroys the chemical structure of haemoglobin.
(d) The inhaled CO adversely affects the respiratory centre in the brain.
Ans: (b)
3. Examine the following statements:
1....