Nutrition — Homi Bhabha Class 9 Biology MCQs with Solutions
Free Homi Bhabha Class 9 Biology Nutrition MCQs with step-by-step solutions (13 questions). Part of Life Processes. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Nutrition · medium · theory
Organisms that make their own food from simple substances are called:
A. parasites
B. heterotrophs
C. decomposers
D. autotrophs ✓ Correct
Solution: Autotrophs (e.g. green plants) synthesise their own food by photosynthesis.
Q2 — Nutrition · medium · theory
The raw materials required for photosynthesis are carbon dioxide and:
A. nitrogen
B. oxygen
C. water ✓ Correct
D. glucose
Solution: Plants use CO₂ and water, in the presence of sunlight and chlorophyll, to make glucose and oxygen.
Q3 — Nutrition · hard · theory
The tiny pores on the surface of leaves through which gases are exchanged are called:
A. stomata ✓ Correct
B. veins
C. lenticels
D. root hairs
Solution: Stomata allow the exchange of CO₂ and O₂ and also the loss of water vapour.
Q4 — Nutrition · medium · theory
The green pigment that traps sunlight for photosynthesis is:
A. melanin
B. chlorophyll ✓ Correct
C. haemoglobin
D. carotene
Solution: Chlorophyll in the chloroplasts absorbs light energy for photosynthesis.
Q5 — Nutrition · hard · theory
Amoeba takes in its food by surrounding it with finger-like extensions called:
A. tentacles
B. pseudopodia ✓ Correct
C. flagella
D. cilia
Solution: Amoeba engulfs food using pseudopodia in a process called phagocytosis.
Q6 — Nutrition · hard · theory
A plant like Cuscuta (Amarbel), which takes food from another living plant, shows:
A. parasitic nutrition ✓ Correct
B. saprophytic nutrition
C. holozoic nutrition
D. autotrophic nutrition
Solution: Cuscuta is a parasite that draws nutrients from a host plant.
Q7 — Nutrition · medium · theory
Fungi that obtain food from dead and decaying matter show:
A. saprophytic nutrition ✓ Correct
B. photosynthesis
C. parasitic nutrition
D. autotrophic nutrition
Solution: Saprophytes like many fungi feed on dead organic matter.
Q8 — Nutrition · hard · theory
In humans, the chemical substances that speed up the digestion of food are called:
A. minerals
B. vitamins
C. hormones
D. enzymes ✓ Correct
Solution: Digestive enzymes break down complex food molecules into simpler absorbable forms.
Q9 — Nutrition · easy · theory
Which process do green plants use to prepare their own food?
A. Respiration
B. Transpiration
C. Digestion
D. Photosynthesis ✓ Correct
Solution: Green plants are autotrophs. They use photosynthesis to make food (glucose) from carbon dioxide and water in the presence of sunlight and chlorophyll.
Q10 — Nutrition · easy · theory
The two raw materials that a leaf takes in for photosynthesis are:
A. Nitrogen and water
B. Carbon dioxide and water ✓ Correct
C. Oxygen and glucose
D. Carbon dioxide and oxygen
Solution: Photosynthesis uses carbon dioxide (from air, through stomata) and water (from soil, through roots), converting them into glucose and releasing oxygen.
Q11 — Nutrition · medium · theory
Which enzyme present in saliva begins the digestion of starch in the mouth?
A. Pepsin
B. Salivary amylase ✓ Correct
C. Lipase
D. Trypsin
Solution: Salivary amylase (ptyalin) starts breaking starch into simpler sugars in the mouth. Pepsin and trypsin act on proteins, and lipase acts on fats.
Q12 — Nutrition · medium · theory
Bile juice contains no digestive enzymes, yet it helps in the digestion of fats. This is because bile:
A. Neutralises salivary amylase
B. Chemically breaks fats into fatty acids by itself
C. Converts fats directly into glucose
D. Breaks large fat droplets into tiny droplets, increasing the surface area for lipase to act ✓ Correct
Solution: Bile emulsifies fats: it turns large fat globules into many small droplets. This increases the surface area on which the enzyme lipase can act, speeding up fat digestion.
Q13 — Nutrition · hard · theory
The pancreas of a person is damaged and secretes very little pancreatic juice. Which digestive activity in the small intestine would be MOST affected?
A. Absorption of water in the large intestine
B. Only protein digestion
C. Only starch digestion in the mouth
D. Digestion of proteins, fats and carbohydrates together in the small intestine ✓ Correct
Solution: Pancreatic juice contains trypsin (proteins), lipase (fats) and pancreatic amylase (carbohydrates). With little of it, the digestion of all three types of food in the small intestine is affected together.