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Life Processes : NCERT Exemplar

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Multiple Choice Questions : -

Q.1 Which of the following statements about the autotrophs is incorrect?

(a) They synthesise carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll

(b) They store carbohydrates in the form of starch

(c) They convert carbon dioxide and water into carbohydrates in the absence of sunlight

(d) They constitute the first trophic level in food chains

Sol. (c)

Q.2 In which of the following groups of organisms, food material is broken down outside the body and absorbed?

(a) Mushroom, green plants, Amoeba

(b) Yeast, mushroom, bread mould

(c) Paramecium, Amoeba, Cuscuta

(d) Cuscuta, lice, tapeworm

Sol. (d)

Q.3 Select the correct statement

(a) Heterotrophs do not synthesise their own food

(b) Heterotrophs utilise solar energy for photosynthesis

(c) Heterotrophs synthesise their own food

(d) Heterotrophs are capable of converting carbon dioxide and water into carbohydrates

Sol. (a)

Q.4 Which is the correct sequence of parts in human alimentary canal?

(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

Sol. (d)

Q.5 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

Sol. (b)

Q.6 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

Sol. (b)

Q.7 Which part of alimentary canal receives bile from the liver?

(a) Stomach

(b) Small intestine

(c) Large intestine

(d) Oesophagus

Sol. (b)

Q.8 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

Sol. (d)

Q.9 In which part of the alimentary canal food is finally digested?

(a) Stomach

(b) Mouth cavity

(c) Large intestine

(d) Small intestine

Sol. (d)

Q.10 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

Sol. (d)

Q.11 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

Sol. (b)

Q.12 The correct sequence of anaerobic reactions in yeast is

Sol. (d)

Q.13 Which of the following is most appropriate for aerobic respiration?

Sol. (d)

Q.14 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)

Sol. (d)

Q.15 Which is the correct sequence of air passage during inhalation?

(a) Nostrils → larynx → pharynx → trachea → lungs

(b) Nasal passage → trachea → pharynx → larynx → alveoli

(c) larynx → nostrils → pharynx → lungs

(d) Nostrils → pharynx → larynx → trachea → alveol

Sol. (d)

Q.16 During respiration exchange of gases take place in

(a) Trachea and larynx

(b) Alveoli of lungs

(c) Alveoli and throat

(d) Throat and larynx

Sol. (b)

Q.17 Which of the following statement (s) is (are) true about heart?

(i) Left atrium receives oxygenated blood from different parts of body while right atrium receives deoxygenated blood from lungs

(ii) Left ventricle pumps oxygenated blood to different body parts while right ventricle pumps deoxygenated blood to lungs

(iii) Left atrium transfers oxygenated blood to right ventricle which sends it to different body parts

(iv) Right atrium receives deoxygenated blood from different parts of the body while left ventricle pumps oxygenated blood to different parts of the body

(a) (i)

(b) (ii)

(c) (ii) and (iv)

(d) (i) and (iii)

Sol. (c)

Q.18 What prevents  backflow  of  blood  inside  the  heart  during contraction?

(a) Valves in heart

(b) Thick muscular walls of ventricles

(c) Thin walls of atria

(d) All of the above

Sol. (a)

Q.19 Single circulation i.e., blood flows through the heart only once during one cycle of passage through the body, is exhibited by

(a) Labeo, Chameleon, Salamander

(b) Hippocampus, Exocoetus, Anabas

(c) Hyla, Rana, Draco

(d) Whale, Dolphin, Turtle

Sol. (b)

Q.20 In which of the following vertebrate group/groups, heart does not pump oxygenated blood to different parts of the body?

(a) Pisces and amphibians

(b) Amphibians and reptiles

(c) Amphibians only

(d) Pisces only

Sol. (d)

Q.21 Choose the correct statement that describes arteries.

(a) They have thick elastic walls, blood flows under high pressure; collect blood from different organs and bring it back to the heart

(b) They have thin walls with valves inside, blood flows under low pressure and carry blood away from the heart to various organs of the body

(c) They have thick elastic walls, blood flows under low pressure; carry blood from the heart to various organs of the body

(d) They have thick elastic walls without valves inside, blood flows under high pressure and carry blood away from the heart to different parts of the body.

Sol. (d)

Q.22 The filtration units of kidneys are called

(a) Ureter

(b) Urethra

(c) Neurons

(d) Nephrons

Sol. (d)

Q.23 Oxygen liberated during photosynthesis comes from

(a) Water

(b) Chlorophyll

(c) Carbon dioxide

(d) Glucose

Sol. (a)

Q.24 The blood leaving the tissues becomes richer in

(a) Carbon dioxide

(b) Water

(c) Haemoglobin

(d) Oxygen

Sol. (a)

Q.25 Which of the following is an incorrect statement?

(a) Organisms grow with time

(b) Organisms must repair and maintain their structure

(c) Movement of molecules does not take place among cells

(d) Energy is essential for life processes

Sol. (c)

Q.26 The internal (cellular) energy reserve in autotrophs is

(a) glycogen

(b) protein

(c) starch

(d) fatty acid

Sol. (c)

Q.27 Which of  the  following  equations  is  the  summary  of photosynthesis?

(a) 6CO2 + 12H2O  → C6H12O6 + 6O2+ 6H2O

(b) 6CO2 + H2O  + Sunlight→ C6H12O6 + O2+ 6H2O

(c) 6CO2 + 12H2O + Chlorophyll + Sunlight→ C6H12O6 + 6O2 + 6H2O

(d) 6CO2 + 12H2O  + Chlorophyll + Sunlight→ C6H12O6 + 6CO2+ 6H2O

Sol. (c)

Q.28 Choose the event that does not occur in photosynthesis

(a) Absorption of light energy by chlorophyll

(b) Reduction of carbon dioxide to carbohydrates

(c) Oxidation of carbon to carbon dioxide

(d) Conversion of light energy to chemical energy

Sol. (c)

Q.29 The opening and closing of the stomatal pore depends upon

(a) oxygen

(b) temperature

(c) water in guard cells

(d) concentration of CO2 in stomata

Sol. (c)

Q.30 Choose the forms in which most plants absorb nitrogen

(i) Proteins

(ii) Nitrates and Nitrites

(iii) Urea

(iv) Atmospheric nitrogen

(a) (i) and (ii)

(b) (ii) and (iii)

(c) (iii) and (iv)

(d) (i) and (iv)

Sol. (b)

Q.31 Which is the first enzyme to mix with food in the digestive tract?

(a) Pepsin

(b) Cellulase

(c) Amylase

(d) Trypsin

Sol. (c)

Q.32 Which of the following statement(s) is (are) correct?

(i) Pyruvate can be converted into ethanol and carbon dioxide by yeast

(ii) Fermentation takes place in aerobic bacteria

(iii) Fermentation takes place in mitochondria

(iv) Fermentation is a form of anaerobic respiration

(a) (i)  and (iii)

(b) (ii) and (iv)

(c) (i) and (iv)

(d) (ii) and (iii)

Sol. (c)

Q.33 Lack of oxygen in muscles often leads to cramps among cricketers.

This results due to

(a) conversion of pyruvate to ethanol

(b) conversion of pyruvate to glucose

(c) non conversion of glucose to pyruvate

(d) conversion of pyruvate to lactic acid

Sol. (d)

Q.34 Choose the correct path of urine in our body

(a) kidney → ureter → urethra  → urinary bladder

(b) kidney → urinary bladder → urethra  → ureter

(c) kidney → ureters → urinary bladder  → urethra

(d) urinary bladder → kidney → ureter → urethra

Sol. (c)

Q.35 During deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid in the

(a) Cytoplasm

(b) Chloroplast

(c) Mitochondria

(d) Golgi body

Sol. (a)


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