Learn › Class 10 CBSE · Science › Life Processes
Life Processes — Class 10 CBSE Science MCQs with Solutions
Free Class 10 CBSE Science Life Processes MCQs with step-by-step solutions. Practise online on Prepizo — no login needed.
▶ Practise Life Processes online (free)
Sample questions with solutions
Q1 — easy
Enzyme present in human saliva that breaks down starch into simple sugars is:
A. Pepsin
B. Salivary Amylase (Ptyalin) ✓ Correct
C. Trypsin
D. Lipase
Solution: Salivary amylase digests starch in the mouth.
Q2 — easy
Inner lining of stomach is protected from action of hydrochloric acid by:
A. Pepsin
B. Mucus ✓ Correct
C. Bile
D. Gastric lipase
Solution: Mucus shields stomach wall from gastric acid corrosion.
Q3 — easy
Bile juice is produced by liver and stored in gall bladder. Its function is to:
A. Digest proteins
B. Emulsify large fat globules and make medium alkaline ✓ Correct
C. Digest starch
D. Absorb water
Solution: Bile emulsifies lipids and neutralizes acidic chyme.
Q4 — easy
Complete digestion of carbohydrates, proteins, and fats takes place in:
A. Stomach
B. Small intestine ✓ Correct
C. Large intestine
D. Mouth
Solution: The small intestine is the site of complete digestion.
Q5 — easy
First step in cellular breakdown of glucose (6-carbon) into pyruvate (3-carbon) occurs in cytoplasm and is called:
A. Krebs cycle
B. Glycolysis ✓ Correct
C. Fermentation
D. Electron transport
Solution: Glycolysis splits glucose into pyruvate in the cytoplasm.
Q6 — easy
Anaerobic respiration in human muscle cells during vigorous exercise produces energy along with:
A. Ethanol and CO₂
B. Lactic acid (3-carbon) ✓ Correct
C. Water and CO₂
D. Acetic acid
Solution: Oxygen debt leads to lactic acid accumulation in muscle tissues.
Q7 — easy
In human heart, oxygenated blood from lungs enters into which chamber first via pulmonary veins?
A. Right atrium
B. Left atrium ✓ Correct
C. Left ventricle
D. Right ventricle
Solution: Pulmonary veins return oxygenated blood to the left atrium.
Q8 — easy
Contraction phase of human heart chambers pumping blood out is termed:
A. Diastole
B. Systole ✓ Correct
C. Pulse
D. Circulation
Solution: Systole refers to heart chamber contraction.
Q9 — easy
Plant vascular tissue that transports synthesized food from leaves to other parts (translocation) is:
A. Xylem
B. Phloem ✓ Correct
C. Parenchyma
D. Cambium
Solution: Phloem conducts organic nutrients bidirectionally.
Q10 — easy
Functional filtration units of human kidneys that form urine are called:
A. Neurons
B. Nephrons ✓ Correct
C. Alveoli
D. Villi
Solution: Nephrons filter blood and concentrate urine.
Q11 — easy
Loss of water in vapor form from aerial parts of plants (stomata) is called:
A. Translocation
B. Transpiration ✓ Correct
C. Excretion
D. Guttation
Solution: Transpiration drives the ascent of sap through xylem vessels.
Q12 — easy
Movement of food through human alimentary canal by rhythmic contraction of canal muscular wall is:
A. Translocation
B. Peristalsis ✓ Correct
C. Circulation
D. Diffusion
Solution: Peristaltic waves propel food down the digestive tract.
Q13 — easy
Respiratory pigment in human red blood cells having high affinity for oxygen is:
A. Chlorophyll
B. Hemoglobin ✓ Correct
C. Melanin
D. Globulin
Solution: Hemoglobin binds and transports oxygen.
Q14 — easy
Nitrogenous waste product eliminated from blood by human kidneys is mainly:
A. Uric acid
B. Urea ✓ Correct
C. Ammonia
D. Amino acid
Solution: Urea is the primary nitrogenous waste in human urine.
Q15 — easy
During daytime, major driving force in movement of water in xylem is:
A. Root pressure
B. Transpiration pull ✓ Correct
C. Osmotic pressure
D. Diffusion
Solution: Stomatal transpiration generates suction pull during daylight hours.