Page 1 : Class 10 Science Chapter 6 Life Processes MCQs with Answers, , Q.1, During respiration exchange of gases take place in, (a) trachea and larynx, , (b) alveok of lungs, , (c) alveoh and throat, , (d) throat and larynx, , Answer, , , , Q.2. Blood from superior vena cava flows into, (a) right atrium, , (b) right ventncle, , (c) left atrium, , (¢) left ventricle, , Answer, , , , (Q.3. The green colour of plants is due to the presence of, (a) chlorophyll, , (b) carotene, , (c) xanthophyll, , (@) starch, , Answer, , , , Q.4. The correct sequence of anaerobic reactions in yeast 5 [NCERT' Exemplar], (a) Ghicose PE Pyruvate Mtochondm, Fehanol + Carbon dioxide, (6) Glucose <n Pyruvate ee > Lactic acid, (c) Glucose SS . Pyruvate Mitochondria, actic acid, (d) Glucose ee Pyruvate — > Ethanol + Carbon dioxide, , Answer, , , , (Q.5. Lipase acts on, {a) ammo acids, , (b) fats, , (c) carbohydrates, (d) all of these

Page 2 : Answer, , , , Q.6. Blood consist of what fluid medium?, (2) Lymph, , (b) Platelets, , (c) Plasma, , (@) Allof these, , Answer, , , , Q.7. In which of the following vertebrate group /groups, heart does not pump oxygenated blood to, different parts of the body? [NCERT Exemplar], , (a) Pisces and amphibians, , (b) Amphibians and reptiles, , (c) Amphibians only, , (d) Pisces only, , AnswerAnswer: (d), , , , Q.8. A student sets up an experiment to study the role of enzymes in digestion of food., , = —, Egg white Egg white, + pepsin + pepsin + HCI, A 8, , In which test tube, the digestion of protein will occur?, , (a) ‘Test cubes A as pepsin will breakdown protem into simple molecules., , (b) Test tube B as HCI will breakdown protein into simple molecules., , (c) Test tube A as pepsin will breakdown into simple molecules., , (@) Test tube B as HCI will activate pepsin for breakdown of protein into simple molecules., , Answer, , , , Q.9. In which part of the alimentary canal food is finally digested? [NCERT Fxemplar], (a) Stomach, (b) Mouth cavity

Page 3 : (c) Large intestine, (@) Small intestine, , Answer, , , , Q.10. When air is blown from mouth into a test-tube containing lime water, the lime water turned, milky due to the presence of [NCERT Exemplar], , (a) oxygen, , (b) carbon dioxide, , (c) nitrogen, , (@) water vapour, , Answer, , , , (Q.11. Choose the correct path of urine in our body. INCERT Exemphr|, (a) Kidney sureter urethra surinary bladder, (b) Kidney ~unnary bladder urethra ~ureter, (c) Kidney ureter sunnary bladder urethra, (d) Urinary bladder >kidney >ureter surethra, , Answer, , , , (Q.12. The internal (cellular) energy reserve in autotrophs is [NCERT Exemplar|, (a) glycogen, , (b) protein, , (c) starch, , (@) fatty acid, , Answer, , , , (Q.13. Which is the correct sequence of parts in human alimentary canal? [NCER'T Exemplar}, (a) Mouth >stomach small intestine oesophagus large intestine, (b) Mouth oesophagus >stomach large intestine +small intestine, (c) Mouth ~stomach ~oesophagus small intestine ~large intestine, (d) Mouth oesophagus stomach —small intestine large intestine, , Answer, , , , Q.14. If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity, will be affected? [(NCERT Exemplar]

Page 4 : (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, , Answer, , , , (Q.15. Which is the first enzyme to mix with food in the dipestive tract? [NCERT Exemphr|, (a) Pepsin, , (6) Cellulase, , (c) Amylase, , (d) ‘Trypsin, , Answer, , , , , , Q.16, The image shows the bread moulds on a bread. How these fungi obtam nutrition?, (a) By using nutrients from the bread to prepare their own food., , (b) By allowing other organisms to grow on the bread and then consuming them., , (c) By breaking down the nutrients of bread and then absorbing them., , (d) By eating the bread on which it is growing., , , , , , Q.17. A student sets up an expenment to study human respiration using lime water, test tube and a, straw. Lime water 1s colourless in the absence of CO2 and ts milky im its presence, The student fills a, freshly prepared himewater m a test tube and blows air through straw into the limewater. It was, observed that the solution turns cloudy as shown. What can be evaluated from this observation?

Page 5 : Lime Test tube, containing, lime water, , A B, (a) Oxygen is exhaled during respiration., (b) Water vapours are produced during respiration., , (c) Carbon dioxide is exhaled during respiration., (d) Glucose is produced during respiration., , Answer, , , , Q.18. A student performs an experiment using a Balsam plant with intact stem, leaves, roots and, flowers. The plant was kept in a test tube containing cosin solution (a pink colour dye). The test tube, mouth was covered using cotton plug as shown., , Cotton plug