Class 10 Science · Chapter 5

Life Processes

266 Class 10 Science questions on Life Processes from the NCERT textbook, NCERT Exemplar and CBSE board papers 2024–2026, each with its answer and a step-by-step solution.

CBSE Class 10 Science previous year papers, with answers →

Questions · page 3 of 14

1. Q41 Exemplar · Multiple Choice Questions
   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 →
2. Q42 Exemplar · Multiple Choice Questions
   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 →
3. Q43 Exemplar · Multiple Choice Questions
   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 →
4. Q44 Exemplar · Multiple Choice Questions
   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 →
5. Q45 Exemplar · Multiple Choice Questions
   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 →
6. Q46 Exemplar · Multiple Choice Questions
   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 →
7. Q47 Exemplar · Multiple Choice Questions
   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 →
8. Q48 Exemplar · Multiple Choice Questions
   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 →
9. Q49 Exemplar · Multiple Choice Questions
   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 →
10. Q50 Exemplar · Multiple Choice Questions
    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 →
11. Q51 Exemplar · Multiple Choice Questions
    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 →
12. Q52 Exemplar · Multiple Choice Questions
    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 →
13. Q53 Exemplar · Multiple Choice Questions
    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 →
14. Q54 Exemplar · Multiple Choice Questions
    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 →
15. Q55 Exemplar · Multiple Choice Questions
    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 →
16. Q56 Exemplar · Multiple Choice Questions
    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 →
17. Q57 Exemplar · Multiple Choice Questions
    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 →
18. Q58 Exemplar · Multiple Choice Questions
    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 →
19. Q59 Exemplar · Multiple Choice Questions
    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 →
20. Q60 Exemplar · Multiple Choice Questions
    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 →