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Home/CLASS 10/science/life processes
Curated PYQ Collection

Top 50 Most Repeated LIFE PROCESSES PYQs | CLASS 10

A curated collection of the most important questions from LIFE PROCESSES, fully solved with step-by-step concepts to prepare for CLASS 10.

Question #1

Practice Question

A.Aerobic respiration uses the electron transport chain, which produces most ATP, while anaerobic respiration lacks this stage.
B.Anaerobic respiration occurs in the mitochondria, which have fewer enzymes than the cytoplasm.
C.Aerobic respiration occurs only in plants, which have chloroplasts that generate extra ATP.
D.Anaerobic respiration uses oxygen as the final electron acceptor, limiting ATP production.

Concept Applied

In aerobic respiration, after glycolysis and the Krebs cycle, electrons are transferred to the electron transport chain where oxidative phosphorylatio...

Read Full Step-by-Step Solution →

Question #2

Practice Question

A.Ethanol & $CO_2$
B.Lactic acid
C.Glucose & $O_2$
D.Water

Concept Applied

Yeast converts glucose to ethanol and carbon dioxide anaerobically....

Read Full Step-by-Step Solution →

Question #3

Practice Question

A.In alveoli, oxygen diffuses from air to blood; in gills, oxygen diffuses from water to blood.
B.In alveoli, oxygen diffuses from blood to air; in gills, oxygen diffuses from blood to water.
C.Both alveoli and gills exchange gases by diffusion of carbon dioxide from blood to the external medium.
D.Alveoli use active transport for oxygen uptake, whereas gills rely on diffusion.

Concept Applied

In human lungs, the alveolar surface is exposed to air, so Oâ‚‚ moves from the air into the blood. Fish gills are bathed by water, so Oâ‚‚ moves from wate...

Read Full Step-by-Step Solution →

Question #4

Practice Question

A.Mitochondria
B.Nucleus
C.Cytoplasm
D.Chloroplast

Concept Applied

Anaerobic respiration in yeast occurs in cytoplasm, producing ethanol and COâ‚‚ without oxygen....

Read Full Step-by-Step Solution →

Question #5

Practice Question

A.Autotrophic organisms synthesize their own organic food using light energy, while heterotrophic organisms obtain food by consuming other organisms.
B.Autotrophic organisms obtain food by consuming other organisms, while heterotrophic organisms synthesize their own organic food using light energy.
C.Both autotrophic and heterotrophic organisms rely on external sources of organic carbon, but only autotrophs use inorganic nitrogen.
D.Autotrophic organisms store food in the form of starch, whereas heterotrophic organisms store food as glycogen.

Concept Applied

Autotrophs (e.g., green plants) use photosynthesis to convert COâ‚‚ and water into glucose using sunlight. Heterotrophs cannot make their own food and m...

Read Full Step-by-Step Solution →

Question #6

Practice Question

A.They actively uptake salts through gill cells to compensate for loss.
B.Their kidneys reabsorb water to prevent dehydration.
C.They excrete excess water to avoid swelling due to hypotonic environment.
D.They produce concentrated urine to conserve water.

Concept Applied

Freshwater is hypotonic relative to fish blood, causing water to enter by osmosis. To prevent swelling, fish excrete large volumes of dilute urine. Ac...

Read Full Step-by-Step Solution →

Question #7

Practice Question

A.Phloem
B.Xylem
C.Stomata
D.Cambium

Concept Applied

Xylem conducts water and minerals from roots to shoots; phloem transports food....

Read Full Step-by-Step Solution →

Question #8

Practice Question

A.Arteries
B.Veins
C.Capillaries
D.Lymphatic vessels

Concept Applied

Arteries carry blood away from the heart. In systemic circulation they transport oxygen‑rich blood to body tissues, whereas veins return deoxygenated ...

Read Full Step-by-Step Solution →

Question #9

Practice Question

A.Aerobic respiration yields 2 ATP, while anaerobic fermentation yields 36 ATP
B.Aerobic respiration yields 36 ATP, while anaerobic fermentation yields 2 ATP
C.Both aerobic respiration and anaerobic fermentation yield 2 ATP
D.Both aerobic respiration and anaerobic fermentation yield 36 ATP

Concept Applied

In aerobic respiration each glucose molecule gives about 36 ATP (2 from glycolysis, 2 from Krebs cycle, ~32 from oxidative phosphorylation). Anaerobic...

Read Full Step-by-Step Solution →

Question #10

Practice Question

A.Oxygen
B.Chlorophyll
C.Glucose
D.Carbon dioxide

Concept Applied

Chlorophyll absorbs light to drive light reactions; others are inputs/outputs....

Read Full Step-by-Step Solution →

Question #11

Practice Question

A.Glomerulus
B.Proximal convoluted tubule
C.Loop of Henle
D.Collecting duct

Concept Applied

The glomerulus contains a network of capillaries where blood plasma is filtered into Bowman's capsule. This is the first step in urine formation. The ...

Read Full Step-by-Step Solution →

Question #12

Practice Question

A.Aerobic respiration uses the electron transport chain, which produces most ATP, while anaerobic respiration lacks this stage.
B.Anaerobic respiration occurs in the mitochondria, which have fewer enzymes than the cytoplasm.
C.Aerobic respiration occurs only in plants, which have chloroplasts that generate extra ATP.
D.Anaerobic respiration uses oxygen as the final electron acceptor, limiting ATP production.

Concept Applied

In aerobic respiration, after glycolysis and the Krebs cycle, electrons are transferred to the electron transport chain where oxidative phosphorylatio...

Read Full Step-by-Step Solution →

Question #13

Practice Question

A.Ethanol & $CO_2$
B.Lactic acid
C.Glucose & $O_2$
D.Water

Concept Applied

Yeast converts glucose to ethanol and carbon dioxide anaerobically....

Read Full Step-by-Step Solution →

Question #14

Practice Question

A.In alveoli, oxygen diffuses from air to blood; in gills, oxygen diffuses from water to blood.
B.In alveoli, oxygen diffuses from blood to air; in gills, oxygen diffuses from blood to water.
C.Both alveoli and gills exchange gases by diffusion of carbon dioxide from blood to the external medium.
D.Alveoli use active transport for oxygen uptake, whereas gills rely on diffusion.

Concept Applied

In human lungs, the alveolar surface is exposed to air, so Oâ‚‚ moves from the air into the blood. Fish gills are bathed by water, so Oâ‚‚ moves from wate...

Read Full Step-by-Step Solution →

Question #15

Practice Question

A.Mitochondria
B.Nucleus
C.Cytoplasm
D.Chloroplast

Concept Applied

Anaerobic respiration in yeast occurs in cytoplasm, producing ethanol and COâ‚‚ without oxygen....

Read Full Step-by-Step Solution →

Question #16

Practice Question

A.Autotrophic organisms synthesize their own organic food using light energy, while heterotrophic organisms obtain food by consuming other organisms.
B.Autotrophic organisms obtain food by consuming other organisms, while heterotrophic organisms synthesize their own organic food using light energy.
C.Both autotrophic and heterotrophic organisms rely on external sources of organic carbon, but only autotrophs use inorganic nitrogen.
D.Autotrophic organisms store food in the form of starch, whereas heterotrophic organisms store food as glycogen.

Concept Applied

Autotrophs (e.g., green plants) use photosynthesis to convert COâ‚‚ and water into glucose using sunlight. Heterotrophs cannot make their own food and m...

Read Full Step-by-Step Solution →

Question #17

Practice Question

A.They actively uptake salts through gill cells to compensate for loss.
B.Their kidneys reabsorb water to prevent dehydration.
C.They excrete excess water to avoid swelling due to hypotonic environment.
D.They produce concentrated urine to conserve water.

Concept Applied

Freshwater is hypotonic relative to fish blood, causing water to enter by osmosis. To prevent swelling, fish excrete large volumes of dilute urine. Ac...

Read Full Step-by-Step Solution →

Question #18

Practice Question

A.Phloem
B.Xylem
C.Stomata
D.Cambium

Concept Applied

Xylem conducts water and minerals from roots to shoots; phloem transports food....

Read Full Step-by-Step Solution →

Question #19

Practice Question

A.Arteries
B.Veins
C.Capillaries
D.Lymphatic vessels

Concept Applied

Arteries carry blood away from the heart. In systemic circulation they transport oxygen‑rich blood to body tissues, whereas veins return deoxygenated ...

Read Full Step-by-Step Solution →

Question #20

Practice Question

A.Aerobic respiration yields 2 ATP, while anaerobic fermentation yields 36 ATP
B.Aerobic respiration yields 36 ATP, while anaerobic fermentation yields 2 ATP
C.Both aerobic respiration and anaerobic fermentation yield 2 ATP
D.Both aerobic respiration and anaerobic fermentation yield 36 ATP

Concept Applied

In aerobic respiration each glucose molecule gives about 36 ATP (2 from glycolysis, 2 from Krebs cycle, ~32 from oxidative phosphorylation). Anaerobic...

Read Full Step-by-Step Solution →

Question #21

Practice Question

A.Oxygen
B.Chlorophyll
C.Glucose
D.Carbon dioxide

Concept Applied

Chlorophyll absorbs light to drive light reactions; others are inputs/outputs....

Read Full Step-by-Step Solution →

Question #22

Practice Question

A.Glomerulus
B.Proximal convoluted tubule
C.Loop of Henle
D.Collecting duct

Concept Applied

The glomerulus contains a network of capillaries where blood plasma is filtered into Bowman's capsule. This is the first step in urine formation. The ...

Read Full Step-by-Step Solution →

Question #23

Practice Question

A.Aerobic respiration uses the electron transport chain, which produces most ATP, while anaerobic respiration lacks this stage.
B.Anaerobic respiration occurs in the mitochondria, which have fewer enzymes than the cytoplasm.
C.Aerobic respiration occurs only in plants, which have chloroplasts that generate extra ATP.
D.Anaerobic respiration uses oxygen as the final electron acceptor, limiting ATP production.

Concept Applied

In aerobic respiration, after glycolysis and the Krebs cycle, electrons are transferred to the electron transport chain where oxidative phosphorylatio...

Read Full Step-by-Step Solution →

Question #24

Practice Question

A.Ethanol & $CO_2$
B.Lactic acid
C.Glucose & $O_2$
D.Water

Concept Applied

Yeast converts glucose to ethanol and carbon dioxide anaerobically....

Read Full Step-by-Step Solution →

Question #25

Practice Question

A.In alveoli, oxygen diffuses from air to blood; in gills, oxygen diffuses from water to blood.
B.In alveoli, oxygen diffuses from blood to air; in gills, oxygen diffuses from blood to water.
C.Both alveoli and gills exchange gases by diffusion of carbon dioxide from blood to the external medium.
D.Alveoli use active transport for oxygen uptake, whereas gills rely on diffusion.

Concept Applied

In human lungs, the alveolar surface is exposed to air, so Oâ‚‚ moves from the air into the blood. Fish gills are bathed by water, so Oâ‚‚ moves from wate...

Read Full Step-by-Step Solution →

Question #26

Practice Question

A.Mitochondria
B.Nucleus
C.Cytoplasm
D.Chloroplast

Concept Applied

Anaerobic respiration in yeast occurs in cytoplasm, producing ethanol and COâ‚‚ without oxygen....

Read Full Step-by-Step Solution →

Question #27

Practice Question

A.Autotrophic organisms synthesize their own organic food using light energy, while heterotrophic organisms obtain food by consuming other organisms.
B.Autotrophic organisms obtain food by consuming other organisms, while heterotrophic organisms synthesize their own organic food using light energy.
C.Both autotrophic and heterotrophic organisms rely on external sources of organic carbon, but only autotrophs use inorganic nitrogen.
D.Autotrophic organisms store food in the form of starch, whereas heterotrophic organisms store food as glycogen.

Concept Applied

Autotrophs (e.g., green plants) use photosynthesis to convert COâ‚‚ and water into glucose using sunlight. Heterotrophs cannot make their own food and m...

Read Full Step-by-Step Solution →

Question #28

Practice Question

A.They actively uptake salts through gill cells to compensate for loss.
B.Their kidneys reabsorb water to prevent dehydration.
C.They excrete excess water to avoid swelling due to hypotonic environment.
D.They produce concentrated urine to conserve water.

Concept Applied

Freshwater is hypotonic relative to fish blood, causing water to enter by osmosis. To prevent swelling, fish excrete large volumes of dilute urine. Ac...

Read Full Step-by-Step Solution →

Question #29

Practice Question

A.Phloem
B.Xylem
C.Stomata
D.Cambium

Concept Applied

Xylem conducts water and minerals from roots to shoots; phloem transports food....

Read Full Step-by-Step Solution →

Question #30

Practice Question

A.Arteries
B.Veins
C.Capillaries
D.Lymphatic vessels

Concept Applied

Arteries carry blood away from the heart. In systemic circulation they transport oxygen‑rich blood to body tissues, whereas veins return deoxygenated ...

Read Full Step-by-Step Solution →

Question #31

Practice Question

A.Aerobic respiration yields 2 ATP, while anaerobic fermentation yields 36 ATP
B.Aerobic respiration yields 36 ATP, while anaerobic fermentation yields 2 ATP
C.Both aerobic respiration and anaerobic fermentation yield 2 ATP
D.Both aerobic respiration and anaerobic fermentation yield 36 ATP

Concept Applied

In aerobic respiration each glucose molecule gives about 36 ATP (2 from glycolysis, 2 from Krebs cycle, ~32 from oxidative phosphorylation). Anaerobic...

Read Full Step-by-Step Solution →

Question #32

Practice Question

A.Oxygen
B.Chlorophyll
C.Glucose
D.Carbon dioxide

Concept Applied

Chlorophyll absorbs light to drive light reactions; others are inputs/outputs....

Read Full Step-by-Step Solution →

Question #33

Practice Question

A.Glomerulus
B.Proximal convoluted tubule
C.Loop of Henle
D.Collecting duct

Concept Applied

The glomerulus contains a network of capillaries where blood plasma is filtered into Bowman's capsule. This is the first step in urine formation. The ...

Read Full Step-by-Step Solution →
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