✅ 1. Which of the following is not a life process? (CBSE 2015)
A. Respiration
B. Reproduction
C. Excretion
D. Growth
✔️ Answer: B. Reproduction
📌 Reproduction is not essential for the survival of an individual.
✅ 2. Which is the correct sequence of the path of food in the human alimentary canal? (CBSE 2014)
A. Mouth → Stomach → Small intestine → Oesophagus → Large intestine
B. Mouth → Oesophagus → Stomach → Small intestine → Large intestine
C. Mouth → Oesophagus → Small intestine → Stomach → Large intestine
D. Mouth → Stomach → Oesophagus → Small intestine → Large intestine
✔️ Answer: B
📌 It follows the correct order anatomically.
✅ 3. Which is the enzyme present in saliva? (CBSE 2016)
A. Pepsin
B. Trypsin
C. Amylase
D. Lipase
✔️ Answer: C. Amylase
📌 It breaks down starch into sugars.
✅ 4. Which part of nephron reabsorbs water and nutrients? (CBSE 2020)
A. Glomerulus
B. Bowman’s capsule
C. Tubule
D. Collecting duct
✔️ Answer: C. Tubule
📌 Tubule reabsorbs useful substances back into the blood.
✅ 5. In which form is food absorbed in the small intestine? (CBSE 2012)
A. Proteins
B. Amino acids
C. Starch
D. Fats
✔️ Answer: B. Amino acids
📌 Proteins are digested into amino acids for absorption.
✅ 6. Which of the following organisms does not have a circulatory system? (CBSE 2013)
A. Amoeba
B. Earthworm
C. Fish
D. Frog
✔️ Answer: A. Amoeba
📌 Amoeba relies on diffusion.
✅ 7. The breakdown of pyruvate to give carbon dioxide, water and energy takes place in – (CBSE 2017)
A. Cytoplasm
B. Mitochondria
C. Chloroplast
D. Nucleus
✔️ Answer: B. Mitochondria
📌 This is aerobic respiration.
✅ 8. What will happen if mucus is not secreted by the gastric glands? (CBSE 2011)
A. Stomach will not digest food
B. HCl will not be secreted
C. Lining of stomach will be damaged
D. Enzymes won’t act
✔️ Answer: C. Lining of stomach will be damaged
📌 Mucus protects stomach lining from acid.
✅ 9. In which part of the plant does photosynthesis occur? (CBSE 2018)
A. Root
B. Leaf
C. Stem
D. Flower
✔️ Answer: B. Leaf
📌 Chloroplasts in leaf cells do photosynthesis.
✅ 10. Which pigment is responsible for trapping sunlight during photosynthesis? (CBSE 2019)
A. Xanthophyll
B. Chlorophyll
C. Carotene
D. Anthocyanin
✔️ Answer: B. Chlorophyll
📌 Essential for converting light energy into chemical energy.
CBSE Class 10 Science: Life Processes – Multiple Choice Questions (MCQs) (Based on NCERT Syllabus 2024-25, Reflecting Past Board Patterns)
Instructions: Choose the correct option for each question.
Nutrition
- Which of the following events in the mouth cavity will be affected if salivary amylase is lacking in the saliva?
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
Answer: b) Starch breaking down into sugars - 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
Answer: c) 6CO2+12H2O+Chlorophyll+Sunlight→C6H12O6+6O2+6H2O - 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
Answer: b) Yeast, mushroom, bread mould - The bile juice is secreted by the:
a) Stomach
b) Pancreas
c) Small intestine
d) Liver
Answer: d) Liver - The final product after digestion of carbohydrates in human beings is:
a) Glucose
b) Amino acids
c) Fatty acids
d) Glycerol
Answer: a) Glucose
Respiration
- The breakdown of pyruvate to give carbon dioxide, water, and energy takes place in:
a) Cytoplasm
b) Mitochondria
c) Chloroplast
d) Nucleus
Answer: b) Mitochondria - Which of the following statements about respiration is true?
a) During inhalation, ribs move inward and diaphragm is raised.
b) In the alveoli, exchange of gases takes place.
c) Haemoglobin has a greater affinity for carbon dioxide than oxygen.
d) All of the above.
Answer: b) In the alveoli, exchange of gases takes place. - What are the products obtained by anaerobic respiration in plants?
a) Lactic acid + energy
b) Carbon dioxide + water + energy
c) Ethanol + carbon dioxide + energy
d) Pyruvate
Answer: c) Ethanol + carbon dioxide + energy - The respiratory pigment in human beings is:
a) Chlorophyll
b) Haemoglobin
c) Myoglobin
d) Carotene
Answer: b) Haemoglobin - The diaphragm flattens and ribs are lifted up when we:
a) Breathe out
b) Breathe in
c) Hold our breath
d) Exhale forcefully
Answer: b) Breathe in
Transportation
- Which of the following is the correct sequence of blood flow in the human heart?
a) Left atrium → Left ventricle → Lungs → Right atrium → Right ventricle
b) Right atrium → Right ventricle → Lungs → Left atrium → Left ventricle
c) Left atrium → Right atrium → Left ventricle → Right ventricle → Lungs
d) Right ventricle → Right atrium → Lungs → Left ventricle → Left atrium
Answer: b) Right atrium → Right ventricle → Lungs → Left atrium → Left ventricle - Arteries are characterized by:
a) Thin, elastic walls and valves
b) Thick, elastic walls and no valves
c) Thin, non-elastic walls and valves
d) Thick, non-elastic walls and no valves
Answer: b) Thick, elastic walls and no valves - The process of transport of food from the leaves to other parts of the plant is called:
a) Transpiration
b) Respiration
c) Translocation
d) Absorption
Answer: c) Translocation - Which component of blood helps in clotting?
a) Red blood cells
b) White blood cells
c) Platelets
d) Plasma
Answer: c) Platelets - Xylem in plants is responsible for the transport of:
a) Food
b) Water
c) Amino acids
d) Oxygen
Answer: b) Water
Excretion
- The filtering units present in the human kidneys are called:
a) Neurons
b) Nephrons
c) Alveoli
d) Bronchioles
Answer: b) Nephrons - Which of the following is NOT a part of the excretory system in humans?
a) Kidneys
b) Ureters
c) Urethra
d) Liver
Answer: d) Liver
(Liver has excretory functions, but is not considered a primary organ of the urinary excretory system) - The main waste product removed by kidneys from the blood is:
a) Ammonia
b) Uric acid
c) Urea
d) Creatinine
Answer: c) Urea - The function of glomerulus in the nephron is:
a) Reabsorption of water
b) Selective reabsorption of useful substances
c) Filtration of blood
d) Secretion of excess salts
Answer: c) Filtration of blood - How do plants get rid of solid waste products?
a) By shedding leaves
b) By dropping fruits
c) By secreting gums and resins
d) All of the above
Answer: d) All of the above
General/Mixed Concepts
- Which of the following is NOT a life process?
a) Nutrition
b) Respiration
c) Reproduction
d) Communication
Answer: d) Communication - The characteristic processes observed in anaerobic respiration are:
i) Presence of oxygen
ii) Release of carbon dioxide
iii) Release of energy
iv) Release of lactic acid
a) i), ii) only
b) i), ii), iii) only
c) ii), iii), iv) only
d) iv) only
Answer: c) ii), iii), iv) only - Which one of the following is a saprophyte?
a) Green plant
b) Mushroom
c) Cuscuta
d) Amoeba
Answer: b) Mushroom - The function of valves in the heart is to:
a) Regulate blood pressure
b) Prevent the backflow of blood
c) Separate oxygenated and deoxygenated blood
d) Pump blood to the lungs
Answer: b) Prevent the backflow of blood - The process of taking in food and utilizing it for growth and energy is called:
a) Respiration
b) Excretion
c) Nutrition
d) Transpiration
Answer: c) Nutrition
