CBSE Class 10 Science Chapter 6 Life Processes Unsolved MCQ

Q.31. If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will be affected?
(a) Proteins breaking down into amino acids
(b) Starch breaking down into sugars
(c) Fats breaking down into fatty acids and glycerol
(d) Absorption of vitamins

Q.32. The inner lining of stomach is protected by one of the following from hydrochloric acid. Choose the correct one
(a) Pepsin
(b) Mucus
(c) Salivary amylase
(d) Bile

Q.33. Which part of alimentary canal receives bile from the liver?
(a) Stomach
(b) Small intestine
(c) Large intestine
(d) Oesophagus

Q.34. A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains
(a) complex proteins
(b) simple proteins
(c) fats
(d) starch

Q.35. In which part of the alimentary canal food is finally digested?
(a) Stomach
(b) Mouth cavity
(c) Large intestine
(d) Small intestine

Q.36. Choose the function of the pancreatic juice from the following
(a) trypsin digests proteins and lipase carbohydrates
(b) trypsin digests emulsified fats and lipase proteins
(c) trypsin and lipase digest fats
(d) trypsin digests proteins and lipase emulsified fats

Q.37. When air is blown from mouth into a test-tube containing lime water, the lime water turned milky due to the presence of
(a) oxygen
(b) carbon dioxide
(c) nitrogen
(d) water vapour

Q.38. The correct sequence of anaerobic reactions in yeast is
(a) Glucose →cytoplasm →Pyruvate →mitochondria →Ethanol + Carbondioxide
(b) Glucose →cytoplasm →Pyruvate →cytoplasm →Lactic acid
(c) Glucose →cytoplasm →Pyruvate →mitochondria →Lactic acid
(d) Glucose →cytoplasm →Pyruvate →cytoplasm →Ethanol + Carbondioxide

Q.39. Which of the following is most appropriate for aerobic respiration?
(a) Glucose →mitochondria →Pyruvate →cytoplasm →CO2+H2O + Energy
(b) Glucose →cytoplasm →Pyruvate →mitochondria →CO2+H2O + Energy
(c) Glucose →cytoplasm →Pyruvate + Energy →mitochondria →CO2+H2O
(d) Glucose →cytoplasm →Pyruvate + Energy →mitochondria →CO2+H2O+ Energy

Q.40. Which of the following statement(s) is (are) true about respiration?
(i) During inhalation, ribs move inward and diaphragm is raised
(ii) In the alveoli, exchange of gases takes place i.e., oxygen from alveolar air diffuses into blood and carbon dioxide from blood into alveolar air
(iii) Haemoglobin has greater affinity for carbon dioxide than oxygen
(iv) Alveoli increase surface area for exchange of gases
(a) (i) and (iv) (b) (ii) and (iii)
(c) (i) and (iii) (d) (ii) and (iv)

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