Q1. How do we usually identify living beings like a dog or a man?
A. By their size ❌
B. By their movement ✅
C. By their colour ❌
D. By their weight ❌
Why correct: Living beings show movement, which is a major sign of life.
Why others wrong: Size, colour and weight do not indicate life.
Q2. Even when a person is asleep, how do we know he is alive?
A. Heartbeat ❌
B. Breathing and growth ✅
C. Talking ❌
D. Walking ❌
Why correct: Breathing and internal life processes continue even during sleep.
Why others wrong: Talking and walking stop during sleep; heartbeat alone is not complete evidence.
Q3. Why are plants considered living?
A. They move fast ❌
B. They grow over time ✅
C. They change colour ❌
D. They shine ❌
Why correct: Growth is a basic characteristic of life.
Why others wrong: Fast movement, colour change and shining are not signs of life.
Q4. Is visible movement a sufficient sign of life?
A. Yes ❌
B. No ✅
C. Sometimes ❌
D. Rarely ❌
Why correct: Some living processes are not visible like respiration inside cells.
Why others wrong: Visible movement alone does not confirm life.
Q5. What type of movement cannot be seen by naked eyes?
A. Body movement ❌
B. Molecular movement ✅
C. Muscle movement ❌
D. Leaf movement ❌
Why correct: Molecular movements happen inside cells and are invisible.
Why others wrong: All other movements can be observed.
Q6. Which movement is essential for life?
A. Muscle movement ❌
B. Blood movement ❌
C. Molecular movement ✅
D. Body movement ❌
Why correct: All life processes depend on molecular movements.
Why others wrong: External movements are not necessary for survival.
Q7. Why are viruses considered controversial as living beings?
A. They grow ❌
B. They breathe ❌
C. They show no molecular movement ✅
D. They eat food ❌
Why correct: Viruses do not show life processes on their own.
Why others wrong: Viruses neither grow nor breathe nor eat.
Q8. Living organisms maintain order in their structure by:
A. Sleeping ❌
B. Repairing themselves ✅
C. Walking ❌
D. Growing tall ❌
Why correct: Repair maintains internal organization.
Why others wrong: Sleeping, walking and height do not maintain order.
Q9. What happens if order breaks down in organisms?
A. They grow faster ❌
B. They become alive ❌
C. They may die ✅
D. They change shape ❌
Why correct: Loss of organization leads to death.
Why others wrong: Growth or shape change do not mean survival.
Q10. Life processes mainly include:
A. Movement only ❌
B. Maintenance functions ✅
C. Colour change ❌
D. Reproduction only ❌
Why correct: Life processes maintain the body.
Why others wrong: Colour and reproduction are not daily survival processes.
Q11. Life processes continue even when we are:
A. Playing ❌
B. Running ❌
C. Sleeping ✅
D. Studying ❌
Why correct: Breathing, digestion and circulation continue during sleep.
Why others wrong: These activities are not constant.
Q12. Why is energy needed for life processes?
A. For fun ❌
B. For repairing and maintenance ✅
C. For movement only ❌
D. For size ❌
Why correct: Energy runs repair, growth and survival functions.
Why others wrong: Energy is not for fun or size alone.
Q13. Source of energy for organisms comes from:
A. Air ❌
B. Food ✅
C. Water ❌
D. Sun only ❌
Why correct: Food supplies chemical energy.
Why others wrong: Air and water don’t provide direct energy.
Q14. Nutrition is the process of:
A. Removing waste ❌
B. Taking food inside the body ✅
C. Breathing ❌
D. Movement ❌
Why correct: Nutrition means intake of food.
Why others wrong: These are different life processes.
Q15. Raw materials needed for growth come from:
A. Inside body ❌
B. Outside environment ✅
C. Air only ❌
D. Water only ❌
Why correct: Nutrients are obtained from surroundings.
Why others wrong: Body does not produce raw materials.
Q16. Most food sources are carbon-based because:
A. Life is carbon-based ✅
B. Water has carbon ❌
C. Oxygen requires it ❌
D. Nitrogen uses it ❌
Why correct: All living molecules are carbon compounds.
Why others wrong: These statements are incorrect.
Q17. Energy from food is finally converted into:
A. Carbon dioxide ❌
B. Uniform usable energy ✅
C. Oxygen ❌
D. Heat only ❌
Why correct: Food energy becomes ATP.
Why others wrong: These are wastes or by-products.
Q18. Common chemical reactions used in body are:
A. Neutralization ❌
B. Oxidation-reduction ✅
C. Precipitation ❌
D. Decomposition ❌
Why correct: Respiration uses redox reactions.
Why others wrong: These reactions are not biological.
Q19. Respiration involves:
A. Digestion ❌
B. Oxygen using food ✅
C. Taking water ❌
D. Removing waste ❌
Why correct: Respiration releases energy from food.
Why others wrong: These are different processes.
Q20. In unicellular organisms, exchange occurs through:
A. Lungs ❌
B. Skin ❌
C. Entire body surface ✅
D. Roots ❌
Why correct: Single cells absorb directly.
Why others wrong: They lack organs.
Q21. Why is diffusion insufficient in multicellular organisms?
A. Cells are smaller ❌
B. Cells are not in contact with environment ✅
C. Body is soft ❌
D. Organs are strong ❌
Why correct: Internal cells need transport system.
Why others wrong: These are irrelevant.
Q22. What develops in multicellular organisms for efficiency?
A. Muscles ❌
B. Specialized tissues ✅
C. Bones ❌
D. Hair ❌
Why correct: Special tissues perform functions.
Why others wrong: These don’t improve efficiency.
Q23. Transport system is needed to move:
A. Bones ❌
B. Food and oxygen ✅
C. Skin ❌
D. Hormones only ❌
Why correct: Transport delivers necessities.
Why others wrong: These are incomplete.
Q24. Harmful by-products are removed through:
A. Nutrition ❌
B. Respiration ❌
C. Excretion ✅
D. Circulation ❌
Why correct: Waste removal is excretion.
Why others wrong: These perform other functions.
Q25. Excretory tissue removes:
A. Oxygen ❌
B. Food ❌
C. Waste ✅
D. Energy ❌
Why correct: Excretion removes wastes.
Why others wrong: Incorrect.
Q26. Maintenance functions are done by:
A. Life processes ✅
B. Muscles ❌
C. Nerves ❌
D. Blood ❌
Why correct: Life processes sustain body.
Why others wrong: They assist only.
Q27. Autotrophs prepare their own food using:
A. Oxygen ❌
B. Chlorophyll, sunlight, CO₂ ✅
C. Nitrogen ❌
D. Protein ❌
Why correct: Photosynthesis needs chlorophyll, sunlight and carbon dioxide.
Why others wrong: Oxygen, nitrogen and proteins do not produce food.
Q28. Organisms which cannot make food are called:
A. Autotrophs ❌
B. Producers ❌
C. Heterotrophs ✅
D. Decomposers only ❌
Why correct: Heterotrophs depend on others for food.
Why others wrong: Autotrophs make food; decomposers are a group of heterotrophs, not all.
Q29. Photosynthesis forms:
A. Water ❌
B. Oxygen only ❌
C. Carbohydrates ✅
D. Proteins ❌
Why correct: Glucose (a carbohydrate) is the main product.
Why others wrong: Oxygen is by-product; proteins need nitrogen.
Q30. Stored food in plants is in the form of:
A. Sugar ❌
B. Protein ❌
C. Starch ✅
D. Oil ❌
Why correct: Plants store glucose as starch.
Why others wrong: Sugar is transported, not stored.
Q31. In humans, stored energy is as:
A. Fat only ❌
B. Glycogen ✅
C. Protein ❌
D. Glucose ❌
Why correct: Excess glucose is stored as glycogen.
Why others wrong: Fat is not immediate stored energy.
Q32. Chlorophyll is found inside:
A. Nucleus ❌
B. Ribosome ❌
C. Chloroplast ✅
D. Vacuole ❌
Why correct: Photosynthesis happens in chloroplasts.
Why others wrong: Other parts have no role in photosynthesis.
Q33. First step of photosynthesis is:
A. Oxygen release ❌
B. Absorption of light ✅
C. Carbon reduction ❌
D. Food transport ❌
Why correct: Light energy activates chlorophyll.
Why others wrong: They occur later.
Q34. Water is split into:
A. Carbon and oxygen ❌
B. Hydrogen and oxygen ✅
C. Nitrogen and oxygen ❌
D. Energy ❌
Why correct: Water breaks into hydrogen and oxygen.
Why others wrong: Incorrect elements.
Q35. Reduction of CO₂ forms:
A. Oxygen ❌
B. Proteins ❌
C. Carbohydrates ✅
D. Nitrogen ❌
Why correct: CO₂ is converted into glucose.
Why others wrong: Incorrect products.
Q36. Desert plants take CO₂ mainly during:
A. Day ❌
B. Night ✅
C. Evening ❌
D. Afternoon ❌
Why correct: To reduce water loss, stomata open at night.
Why others wrong: Daytime causes more transpiration.
Q37. Gas exchange in plants happens through:
A. Roots ❌
B. Flowers ❌
C. Stomata ✅
D. Aerial roots ❌
Why correct: Stomata control gas flow.
Why others wrong: They are not exchange organs.
Q38. Guard cells control:
A. Leaf size ❌
B. Flower shape ❌
C. Opening of stomata ✅
D. Colour ❌
Why correct: Guard cells regulate stomatal openings.
Why others wrong: No relation.
Q39. Stomata close to prevent:
A. Oxygen loss ❌
B. Water loss ✅
C. Sunlight ❌
D. Nitrogen intake ❌
Why correct: Closing prevents transpiration.
Why others wrong: Incorrect.
Q40. Nitrogen is required for:
A. Making starch ❌
B. Protein synthesis ✅
C. Oxygen release ❌
D. Colour change ❌
Why correct: Proteins contain nitrogen.
Why others wrong: Starch and gases don’t.
Q41. Nitrogen is taken mainly as:
A. Oxygen ❌
B. Nitrates and nitrites ✅
C. Sugar ❌
D. Fat ❌
Why correct: Plants absorb nitrogen in soluble form.
Why others wrong: These don’t contain nitrogen.
Q42. Fungi perform nutrition by:
A. Photosynthesis ❌
B. External digestion ✅
C. Breathing ❌
D. Drinking ❌
Why correct: Fungi digest outside & absorb food.
Why others wrong: They lack chlorophyll.
Q43. Amoeba eats using:
A. Mouth ❌
B. Tentacles ❌
C. Pseudopodia ✅
D. Teeth ❌
Why correct: It surrounds food with pseudopodia.
Why others wrong: Amoeba has no organs.
Q44. Food in amoeba is digested in:
A. Nucleus ❌
B. Food vacuole ✅
C. Cell wall ❌
D. Ribosome ❌
Why correct: Digestion happens in food vacuole.
Why others wrong: These structures are unrelated.
Q45. Parasitic organisms take food:
A. From soil ❌
B. From dead matter ❌
C. From other living organisms ✅
D. From air ❌
Why correct: Parasites depend on host.
Why others wrong: Incorrect source.
Q46. Example of parasite is:
A. Lion ❌
B. Cow ❌
C. Cuscuta ✅
D. Frog ❌
Why correct: Cuscuta sucks food from host plant.
Why others wrong: They feed independently.
Q47. Nutrition varies because:
A. Size is large ❌
B. Environment differs ✅
C. Body is weak ❌
D. Colour changes ❌
Why correct: Habitat decides nutrition type.
Why others wrong: Not relevant.
Q48. Enzymes are:
A. Hormones ❌
B. Bio-catalysts ✅
C. Energy units ❌
D. Vitamins ❌
Why correct: Enzymes speed up reactions.
Why others wrong: They have different functions.
Q49. Single-celled organisms use for nutrition:
A. Special organs ❌
B. Transport system ❌
C. Whole surface ✅
D. Heart ❌
Why correct: Absorption occurs through membrane.
Why others wrong: They lack organs.
Q50. Life processes are essential to:
A. Improve appearance ❌
B. Prevent breakdown ✅
C. Increase colour ❌
D. Produce sound ❌
Why correct: Life processes maintain the body.
Why others wrong: These are not survival functions.