CBSE Class 10 Science Chapter 6 Life Processes Unsolved MCQ

CBSE Class 10 Science Chapter 6 Life Processes Unsolved MCQ

Q.1. Tick the correct statement.
(a) Arteries carry blood away from the heart while veins carry blood towards heart.
(b) Veins carry blood away from the heart while arteries carry blood towards heart.
(c) Both of them carry blood in the same direction.
(d) Either of them can carry blood away from the blood.

Q.2. Artificial removal of nitrogenous wastes from the human body in the event of kidney failure is
(a) Plasmolysis
(b) Dialysis
(c) Diffusion
(d) Osmosis

Q.3. The function of salivary amylase is to convert
(a) Fats into fatty acids.
(b) Proteins into amino acids.
(c) Starch into sugar.
(d) Sugar into starch

Q.4. The parts shown as A and B in the given diagram are
The parts shown as A and B in the given diagram are
a) A is epidermal cell, B is stomatal pore
b) A is guard cell, B is stomatal pore
c) A is epidermal cell, B is guard cell
d) A is guard cells, B is epidermal cell

Q.5. The kidneys in human beings are a part of the system for
(a) nutrition.
(b) respiration.
(c) excretion.
(d) transportation.

Q.6. The xylem in plants are responsible for
(a) transport of water.
(b) transport of food.
(c) transport of amino acids.
(d) transport of oxygen.

Q.7. The autotrophic mode of nutrition requires
(a) carbon dioxide and water.
(b) chlorophyll.
(c) sunlight.
(d) all of the above.

Q.8. The breakdown of pyruvate to give carbon dioxide, water and energy takes place in
(a) cytoplasm.
(b) mitochondria.
(c) chloroplast.
(d) nucleus.

Q.9. Movement of food through oesophagus is due to
(a) Lubrication by saliva
(b) Peristalsis
(c) Gravitational Pull
(d) All of the above

Q.10. Where is bile produced?
(a) Gall bladder (b) Blood
(c) Liver (d) Spleen

Q.11. In normal expiration, the diaphragm is
(a) Arched (b) Flattened
(c) Perforated (d) None of these

Q.12. The correct pathway of blood in circulatory system is
(a) atria → ventricles → arteries → veins
(b) ventricles → atria → veins → arteries
(c) ventricles → veins → arteries → atria
(d) veins → ventricles → atria → arteries

Q.13. Respiration is a process in which
(a) Energy is stored in the form of ADP
(b) Energy is released and stored in the form of ATP
(c) Energy is used up
(d) Energy is not released at all.

Q.14. In Photosynthetic process, atmospheric carbondioxide is __________ to carbohydrates.
a) oxidised
b) Reduced
c) Neutralised
d) Burnt

Q.15. When water enters the guard cells the stomata
a) Opens
b) Closes
c) Open or closes
d) No effect

Q.16. Wastes concentrated in the tubules of Bowman’s capsule are called __.
(a) salts.
(b) juices
(c) urine
(d) amino acids

Q.17. On seeing good food our mouth waters. This fluid is actually
a) Water
b) Hormone
c) Enzyme
d) None of the above

Q.18. The enzyme Pepsin is inactive in stomach without the presence of
a) Nitric Acid
b) Hydrochloric acid
c) Acetic acid
d) Butyric acid

Q.19. Villi present on the inner lining of the intestinal wall
a) Secretes enzymes for digestion
b) Secretes hormones
c) Decreases the surface area for absorption
d) Increases the surface area for absorption

Q.20. During cellular respiration one molecule of glucose is first broken down into two molecules of
a) Acetic acid
b) Pyruvic acid
c) Lactic acid
d) None of the above

Q.21. Rajib was absent in the class because of muscle pain which he claims to be due to excess physical exercise he had done yesterday. This pain is due to
a) Formation of lactic acid
b) Formation of acetic acid
c) Formation of Pyruvic acid
d) Formation of Hydrochloric acid

Q.22. Right part of the human heart contains
a) Oxygenated blood
b) Mixed blood
c) Deoxygenated blood
d) No blood

Q.23. The transport of soluble products of photosynthesis is called translocation and it occurs in the part of the vascular tissue called
a) Xylem
b) Sclerenchyma
c) Phloem
d) Collenchyma

Q.24. In human each kidney has large numbers of filtration units called _
a) Neutrons
b) Neurons
c) Neptune
d) Nephrons

Q.25. Haemoglobin is a type of
(a) Carbohydrate
(b) Skin Pigment
(c) Vitamin
(d) Respiratory Pigment

Q.26. If kidney fails to reabsorb water, the tissues would
(a) remain unaffected
(b) shrink to shrivel
(c) absorb water from blood
(d) take more oxygen from blood

Q.27. 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

Q.28. 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

Q.29. 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

Q.30. 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

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)

Q.41. 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 →alveoli

Q.42. During respiration exchange of gases take place in
(a) trachea and larynx (b) alveoli of lungs
(c) alveoli and throat (d) throat and larynx

Q.43. 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)

Q.44. 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

Q.45. 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

Q.46. 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

Q.47. 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.

Q.48. The filtration units of kidneys are called
(a) ureter
(b) urethra
(c) neurons
(d) nephrons

Q.49. Oxygen liberated during photosynthesis comes from
(a) water
(b) chlorophyll
(c) carbon dioxide
(d) glucose

Q.50. The blood leaving the tissues becomes richer in
(a) carbon dioxide (b) water
(c) heamoglobin (d) oxygen

Q.51. 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

Q.52. The internal (cellular) energy reserve in autotrophs is
(a) glycogen (b) protein
(c) starch (d) fatty acid

Q.53. Which of the following equations is the summary of photosynthesis?
(a) 6CO2 + 12H2O → C6H12O6 + 6O2+ 6H2O
(b) 6CO2 + H2O + Sunlight→ C6H12O6 + O2+ 6 H2O
(c) 6 CO2 + 12 H2O + Chlorophyll + Sunlight→ C6H12O6 + 6O2+ 6H2O
(d) 6 CO2 + 12 H2O + Chlorophyll + Sunlight→ C6H12O6 + 6 CO2+ 6 H2O

Q.54. 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

Q.55. 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

Q.56. 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)

Q.57. Which is the first enzyme to mix with food in the digestive tract?
(a) Pepsin (b) Cellulase (c) Amylase (d) Trypsin

Q.58. 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)

Q.59. 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

Q.60. 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

Q.61. 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

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