Chapter 6 · Life Processes

NCERT Exemplar Class 10 Science Chapter 6 Multiple Choice Questions

All 35 questions of NCERT Exemplar Class 10 Science Chapter 6 Multiple Choice Questions (Life Processes), in the book's order, each with its answer and a step-by-step solution.

1. Q1
   Which of ​the ​following ​statements about ​the ​autotrophs ​is incorrect?

   1. (a)They synthesise carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll
   2. (b)They store carbohydrates in the form of starch
   3. (c)They convert carbon dioxide and water into carbohydrates in the absence of sunlight
   4. (d)They constitute the first trophic level in food chains
   Show answer

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

   Step-by-step solution →
2. Q2
   In ​which of the ​following groups of ​organisms, food ​material ​is broken down outside the ​body and absorbed?

   1. (a)Mushroom, green plants, Amoeba
   2. (b)Yeast, mushroom, bread mould
   3. (c)Paramecium, Amoeba, Cuscuta
   4. (d)Cuscuta, lice, tapeworm
   Show answer

   (b) Yeast, mushroom, bread mould

   Step-by-step solution →
3. Q3
   Select the correct statement

   1. (a)Heterotrophs do not synthesise their own food
   2. (b)Heterotrophs utilise solar energy for photosynthesis
   3. (c)Heterotrophs synthesise their own food
   4. (d)Heterotrophs are capable of converting carbon dioxide and water into carbohydrates
   Show answer

   (a) Heterotrophs do not synthesise their own food

   Step-by-step solution →
4. Q4
   Which ​is ​the ​correct sequence ​of ​parts in human alimentary canal?

   1. (a)$\text{Mouth}\to \text{stomach}\to \text{small intestine}\to \text{oesophagus}\to \text{large intestine}$
   2. (b)$\text{Mouth}\to \text{oesophagus}\to \text{stomach}\to \text{large intestine}\to \text{small intestine}$
   3. (c)$\text{Mouth}\to \text{stomach}\to \text{oesophagus}\to \text{small intestine}\to \text{large intestine}$
   4. (d)$\text{Mouth}\to \text{oesophagus}\to \text{stomach}\to \text{small intestine}\to \text{large intestine}$
   Show answer

   (d) $\text{Mouth}\to \text{oesophagus}\to \text{stomach}\to \text{small intestine}\to \text{large intestine}$

   Step-by-step solution →
5. Q5
   If ​salivary amylase ​is lacking in the saliva, ​which of the following events ​in ​the mouth ​cavity ​will be affected?

   1. (a)Proteins breaking down into amino acids
   2. (b)Starch breaking down into sugars
   3. (c)Fats breaking down into fatty acids and glycerol
   4. (d)Absorption of vitamins
   Show answer

   (b) Starch breaking down into sugars

   Step-by-step solution →
6. Q6
   The inner lining of stomach ​is ​protected by ​one of ​the following from hydrochloric acid. ​Choose the correct ​one

   1. (a)Pepsin
   2. (b)Mucus
   3. (c)Salivary amylase
   4. (d)Bile
   Show answer

   (b) Mucus

   Step-by-step solution →
7. Q7
   Which ​part ​of alimentary ​canal ​receives bile from ​the ​liver?

   1. (a)Stomach
   2. (b)Small intestine
   3. (c)Large intestine
   4. (d)Oesophagus
   Show answer

   (b) Small intestine

   Step-by-step solution →
8. Q8
   A few ​drops ​of iodine solution ​were added to rice water. The solution ​turned blue-black in colour. ​This indicates that rice water ​contains

   1. (a)complex proteins
   2. (b)simple proteins
   3. (c)fats
   4. (d)starch
   Show answer

   (d) starch

   Step-by-step solution →
9. Q9
   In ​which ​part of ​the ​alimentary ​canal food ​is finally ​digested?

   1. (a)Stomach
   2. (b)Mouth cavity
   3. (c)Large intestine
   4. (d)Small intestine
   Show answer

   (d) Small intestine

   Step-by-step solution →
10. Q10
    Choose the function ​of ​the ​pancreatic ​juice ​from the ​following

    1. (a)trypsin digests proteins and lipase carbohydrates
    2. (b)trypsin digests emulsified fats and lipase proteins
    3. (c)trypsin and lipase digest fats
    4. (d)trypsin digests proteins and lipase emulsified fats
    Show answer

    (d) trypsin digests proteins and lipase emulsified fats

    Step-by-step solution →
11. Q11
    When air is blown ​from mouth into ​a test-tube containing ​lime ​water, ​the lime water ​turned ​milky due to the presence of

    1. (a)oxygen
    2. (b)carbon dioxide
    3. (c)nitrogen
    4. (d)water vapour
    Show answer

    (b) carbon dioxide

    Step-by-step solution →
12. Q12
    The ​correct sequence of ​anaerobic ​reactions in ​yeast ​is

    1. (a)$\text{Glucose}\stackrel{\text{cytoplasm}}{\to }\text{Pyruvate}\stackrel{\text{mitochondria}}{\to }\text{Ethanol}+\text{Carbondioxide}$
    2. (b)$\text{Glucose}\stackrel{\text{cytoplasm}}{\to }\text{Pyruvate}\stackrel{\text{cytoplasm}}{\to }\text{Lactic acid}$
    3. (c)$\text{Glucose}\stackrel{\text{cytoplasm}}{\to }\text{Pyruvate}\stackrel{\text{mitochondria}}{\to }\text{Lactic acid}$
    4. (d)$\text{Glucose}\stackrel{\text{cytoplasm}}{\to }\text{Pyruvate}\stackrel{\text{cytoplasm}}{\to }\text{Ethanol}+\text{Carbondioxide}$
    Show answer

    (d) $\text{Glucose}\stackrel{\text{cytoplasm}}{\to }\text{Pyruvate}\stackrel{\text{cytoplasm}}{\to }\text{Ethanol}+\text{Carbondioxide}$

    Step-by-step solution →
13. Q13
    Which of ​the ​following ​is ​most appropriate for ​aerobic respiration?

    1. (a)$\text{Glucose}\stackrel{\text{mitochondria}}{\to }\text{Pyruvate}\stackrel{\text{cytoplasm}}{\to }{\text{CO}}_2+{\text{H}}_2\text{O}+\text{Energy}$
    2. (b)$\text{Glucose}\stackrel{\text{cytoplasm}}{\to }\text{Pyruvate}\stackrel{\text{mitochondria}}{\to }{\text{CO}}_2+{\text{H}}_2\text{O}+\text{Energy}$
    3. (c)$\text{Glucose}\stackrel{\text{cytoplasm}}{\to }\text{Pyruvate}+\text{Energy}\stackrel{\text{mitochondria}}{\to }{\text{CO}}_2+{\text{H}}_2\text{O}$
    4. (d)$\text{Glucose}\stackrel{\text{cytoplasm}}{\to }\text{Pyruvate}+\text{Energy}\stackrel{\text{mitochondria}}{\to }{\text{CO}}_2+{\text{H}}_2\text{O}+\text{Energy}$
    Show answer

    (d) $\text{Glucose}\stackrel{\text{cytoplasm}}{\to }\text{Pyruvate}+\text{Energy}\stackrel{\text{mitochondria}}{\to }{\text{CO}}_2+{\text{H}}_2\text{O}+\text{Energy}$

    Step-by-step solution →
14. Q14
    Which of the following ​statement(s) is ​(are) true ​about respiration?

    1. (i)During inhalation, ribs move inward and diaphragm is raised
    2. (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
    3. (iii)Haemoglobin ​has greater affinity for ​carbon dioxide than oxygen
    4. (iv)Alveoli increase surface area for exchange of gases

    1. (a)(i) and (iv)
    2. (b)(ii) and (iii)
    3. (c)(i) and (iii)
    4. (d)(ii) and (iv)
    Show answer

    (d) (ii) and (iv)

    Step-by-step solution →
15. Q15
    Which is ​the correct ​sequence of air passage ​during ​inhalation?

    1. (a)$\text{Nostrils}\to \text{larynx}\to \text{pharynx}\to \text{trachea}\to \text{lungs}$
    2. (b)$\text{Nasal passage}\to \text{trachea}\to \text{pharynx}\to \text{larynx}\to \text{alveoli}$
    3. (c)$\text{larynx}\to \text{nostrils}\to \text{pharynx}\to \text{lungs}$
    4. (d)$\text{Nostrils}\to \text{pharynx}\to \text{larynx}\to \text{trachea}\to \text{alveoli}$
    Show answer

    (d) $\text{Nostrils}\to \text{pharynx}\to \text{larynx}\to \text{trachea}\to \text{alveoli}$

    Step-by-step solution →
16. Q16
    During respiration ​exchange ​of gases ​take ​place ​in

    1. (a)trachea and larynx
    2. (b)alveoli of lungs
    3. (c)alveoli and throat
    4. (d)throat and larynx
    Show answer

    (b) alveoli of lungs

    Step-by-step solution →
17. Q17
    Which of the following statement (s) is (are) true ​about heart?

    1. (i)Left atrium ​receives oxygenated blood ​from different parts of ​body while right atrium receives deoxygenated blood from lungs
    2. (ii)Left ventricle pumps oxygenated blood to different body parts while right ventricle pumps deoxygenated blood to lungs
    3. (iii)Left atrium transfers oxygenated blood ​to right ventricle which sends it to different body parts
    4. (iv)Right atrium receives deoxygenated blood from different parts of the body ​while left ventricle pumps oxygenated ​blood to different ​parts of the body

    1. (a)(i)
    2. (b)(ii)
    3. (c)(ii) and (iv)
    4. (d)(i) and (iii)
    Show answer

    (c) (ii) and (iv)

    Step-by-step solution →
18. Q18
    What ​prevents ​backflow ​of ​blood inside the ​heart during contraction?

    1. (a)Valves in heart
    2. (b)Thick muscular walls of ventricles
    3. (c)Thin walls of atria
    4. (d)All of the above
    Show answer

    (a) Valves in heart

    Step-by-step solution →
19. Q19
    Single ​circulation ​i.e., ​blood flows through the ​heart only once during ​one cycle of passage through the body, is exhibited by

    1. (a)Labeo, Chameleon, Salamander
    2. (b)Hippocampus, Exocoetus, Anabas
    3. (c)Hyla, Rana, Draco
    4. (d)Whale, Dolphin, Turtle
    Show answer

    (b) Hippocampus, Exocoetus, Anabas

    Step-by-step solution →
20. Q20
    In ​which of the ​following vertebrate group/groups, ​heart does not ​pump oxygenated blood ​to ​different parts ​of the body?

    1. (a)Pisces and amphibians
    2. (b)Amphibians and reptiles
    3. (c)Amphibians only
    4. (d)Pisces only
    Show answer

    (d) Pisces only

    Step-by-step solution →
21. Q21
    Choose ​the ​correct ​statement ​that describes arteries.

    1. (a)They have thick elastic walls, blood flows under high pressure; collect blood from different organs and bring it back to the heart
    2. (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
    3. (c)They have thick elastic walls, blood flows under low pressure; carry blood from the heart to various organs of the body
    4. (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.
    Show answer

    (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.

    Step-by-step solution →
22. Q22
    The filtration ​units ​of ​kidneys ​are called

    1. (a)ureter
    2. (b)urethra
    3. (c)neurons
    4. (d)nephrons
    Show answer

    (d) nephrons

    Step-by-step solution →
23. Q23
    Oxygen ​liberated ​during ​photosynthesis comes from

    1. (a)water
    2. (b)chlorophyll
    3. (c)carbon dioxide
    4. (d)glucose
    Show answer

    (a) water

    Step-by-step solution →
24. Q24
    The blood ​leaving ​the tissues becomes ​richer ​in

    1. (a)carbon dioxide
    2. (b)water
    3. (c)heamoglobin
    4. (d)oxygen
    Show answer

    (a) carbon dioxide

    Step-by-step solution →
25. Q25
    Which ​of the ​following ​is ​an ​incorrect statement?

    1. (a)Organisms grow with time
    2. (b)Organisms must repair and maintain their structure
    3. (c)Movement of molecules does not take place among cells
    4. (d)Energy is essential for life processes
    Show answer

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

    Step-by-step solution →
26. Q26
    The ​internal (cellular) ​energy ​reserve ​in autotrophs ​is

    1. (a)glycogen
    2. (b)protein
    3. (c)starch
    4. (d)fatty acid
    Show answer

    (c) starch

    Step-by-step solution →
27. Q27
    Which of ​the ​following ​equations ​is ​the ​summary of photosynthesis?

    1. (a)$6{\text{CO}}_2+12{\text{H}}_2\text{O}\to {\text{C}}_6{\text{H}}_{12}{\text{O}}_6+6{\text{O}}_2+6{\text{H}}_2\text{O}$
    2. (b)$6{\text{CO}}_2+{\text{H}}_2\text{O}+\text{Sunlight}\to {\text{C}}_6{\text{H}}_{12}{\text{O}}_6+{\text{O}}_2+6{\text{H}}_2\text{O}$
    3. (c)$6{\text{CO}}_2+12{\text{H}}_2\text{O}+\text{Chlorophyll}+\text{Sunlight}\to {\text{C}}_6{\text{H}}_{12}{\text{O}}_6+6{\text{O}}_2+6{\text{H}}_2\text{O}$
    4. (d)$6{\text{CO}}_2+12{\text{H}}_2\text{O}+\text{Chlorophyll}+\text{Sunlight}\to {\text{C}}_6{\text{H}}_{12}{\text{O}}_6+6{\text{CO}}_2+6{\text{H}}_2\text{O}$
    Show answer

    (c) $6{\text{CO}}_2+12{\text{H}}_2\text{O}+\text{Chlorophyll}+\text{Sunlight}\to {\text{C}}_6{\text{H}}_{12}{\text{O}}_6+6{\text{O}}_2+6{\text{H}}_2\text{O}$

    Step-by-step solution →
28. Q28
    Choose ​the ​event ​that does ​not ​occur ​in photosynthesis

    1. (a)Absorption of light energy by chlorophyll
    2. (b)Reduction of carbon dioxide to carbohydrates
    3. (c)Oxidation of carbon to carbon dioxide
    4. (d)Conversion of light energy to chemical energy
    Show answer

    (c) Oxidation of carbon to carbon dioxide

    Step-by-step solution →
29. Q29
    The ​opening and closing of ​the ​stomatal pore ​depends ​upon

    1. (a)oxygen
    2. (b)temperature
    3. (c)water in guard cells
    4. (d)concentration of ${\text{CO}}_2$ in stomata
    Show answer

    (c) water in guard cells

    Step-by-step solution →
30. Q30
    Choose the ​forms ​in which ​most plants absorb nitrogen

    1. (i)Proteins
    2. (ii)​Nitrates ​and ​Nitrites
    3. (iii)Urea
    4. (iv)Atmospheric nitrogen

    1. (a)(i) and (ii)
    2. (b)(ii) and (iii)
    3. (c)(iii) and (iv)
    4. (d)(i) and (iv)
    Show answer

    (b) (ii) and (iii)

    Step-by-step solution →
31. Q31
    Which ​is the first ​enzyme to ​mix ​with food ​in the ​digestive tract?

    1. (a)Pepsin
    2. (b)Cellulase
    3. (c)Amylase
    4. (d)Trypsin
    Show answer

    (c) Amylase

    Step-by-step solution →
32. Q32
    Which of the following statement(s) is (are) correct?

    1. (i)Pyruvate can be converted into ethanol and ​carbon dioxide ​by ​yeast
    2. (ii)Fermentation ​takes place ​in ​aerobic bacteria
    3. (iii)Fermentation takes place in ​mitochondria
    4. (iv)Fermentation ​is a form of anaerobic respiration

    1. (a)(i) and (iii)
    2. (b)(ii) and (iv)
    3. (c)(i) and (iv)
    4. (d)(ii) and (iii)
    Show answer

    (c) (i) and (iv)

    Step-by-step solution →
33. Q33
    Lack ​of oxygen in ​muscles often leads to cramps ​among cricketers. ​This ​results due to

    1. (a)conversion of pyruvate to ethanol
    2. (b)conversion of pyruvate to glucose
    3. (c)non conversion of glucose to pyruvate
    4. (d)conversion of pyruvate to lactic acid
    Show answer

    (d) conversion of pyruvate to lactic acid

    Step-by-step solution →
34. Q34
    Choose ​the ​correct ​path ​of urine in our body

    1. (a)kidney $\to$ ureter $\to$ urethra $\to$ urinary bladder
    2. (b)kidney $\to$ urinary bladder $\to$ urethra $\to$ ureter
    3. (c)kidney $\to$ ureters $\to$ urinary bladder $\to$ urethra
    4. (d)urinary bladder $\to$ kidney $\to$ ureter $\to$ urethra
    Show answer

    (c) kidney $\to$ ureters $\to$ urinary bladder $\to$ urethra

    Step-by-step solution →
35. Q35
    During deficiency ​of ​oxygen in tissues ​of human ​beings, pyruvic ​acid ​is converted into lactic acid in ​the

    1. (a)cytoplasm
    2. (b)chloroplast
    3. (c)mitochondria
    4. (d)golgi body
    Show answer

    (a) cytoplasm

    Step-by-step solution →