1. Which component of blood carries oxygen?
a) White blood cells
b) Platelets
c) Plasma
d) Red blood cells [Correct: d]
2. Which part of the nephron filters blood?
a) Glomerulus [Correct]
b) Tubule
c) Bowman's capsule
d) Loop of Henle
3. What is the main function of hemoglobin?
a) Digestion
b) Transport of oxygen [Correct]
c) Excretion
d) Nerve transmission
4. Which process occurs in mitochondria?
a) Photosynthesis
b) Respiration [Correct]
c) Digestion
d) Filtration
5. Anaerobic respiration in muscles produces:
a) Carbon dioxide
b) Alcohol
c) Lactic acid [Correct]
d) Oxygen
6. Which organ is not part of the human digestive system?
a) Liver
b) Pancreas
c) Kidney [Correct]
d) Small intestine
7. Which structure prevents food from entering the windpipe?
a) Epiglottis [Correct]
b) Larynx
c) Trachea
d) Pharynx
8. Which of these is an example of heterotrophic nutrition?
a) Algae
b) Moss
c) Fungi [Correct]
d) Grass
9. In humans, urea is excreted by the:
a) Lungs
b) Skin
c) Kidneys [Correct]
d) Liver
10. Transpiration in plants helps in:
a) Photosynthesis
b) Water absorption
c) Water loss
d) Transport of minerals [Correct]
11. The site of gaseous exchange in human lungs is:
a) Trachea
b) Bronchi
c) Alveoli [Correct]
d) Larynx
12. Which process uses solar energy to synthesize food?
a) Respiration
b) Transpiration
c) Photosynthesis [Correct]
d) Digestion
13. Which part of the heart receives oxygenated blood from lungs?
a) Right atrium
b) Left atrium [Correct]
c) Right ventricle
d) Left ventricle
14. Blood vessels that carry blood away from the heart are:
a) Veins
b) Arteries [Correct]
c) Capillaries
d) Lymph vessels
15. Which waste product is removed through the skin?
a) Urea
b) Carbon dioxide
c) Salts and water [Correct]
d) Glucose
16. Which gas is removed during exhalation?
a) Oxygen
b) Nitrogen
c) Carbon dioxide [Correct]
d) Hydrogen
17. Which of these organs produces insulin?
a) Liver
b) Pancreas [Correct]
c) Kidney
d) Spleen
18. The inner lining of the stomach secretes:
a) Bile
b) Pancreatic juice
c) Gastric juice [Correct]
d) Saliva
19. The basic functional unit of kidney is:
a) Neuron
b) Nephron [Correct]
c) Alveoli
d) Glomerulus
20. The main function of platelets is:
a) Transport oxygen
b) Fight infection
c) Help in clotting [Correct]
d) Carry hormones
21. Which blood vessel carries deoxygenated blood from heart to lungs?
a) Pulmonary artery [Correct]
b) Pulmonary vein
c) Aorta
d) Vena cava
22. Which structure in plants helps in gaseous exchange?
a) Xylem
b) Phloem
c) Stomata [Correct]
d) Root hairs
23. Which enzyme is secreted by the pancreas?
a) Pepsin
b) Trypsin [Correct]
c) Amylase
d) Maltase
24. The excretory system removes:
a) Glucose
b) Carbon dioxide
c) Undigested food
d) Metabolic wastes [Correct]
25. Which gas is essential for aerobic respiration?
a) Nitrogen
b) Oxygen [Correct]
c) Carbon dioxide
d) Hydrogen
26. The organ that stores bile is:
a) Liver
b) Gall bladder [Correct]
c) Pancreas
d) Small intestine
27. The large intestine absorbs:
a) Proteins
b) Fats
c) Water [Correct]
d) Carbohydrates
28. In amoeba, food is digested in:
a) Mouth
b) Gullet
c) Food vacuole [Correct]
d) Stomach
29. The diaphragm helps in:
a) Digestion
b) Breathing [Correct]
c) Circulation
d) Excretion
30. Correct pathway for urine flow is:
a) Kidney → Ureter → Bladder → Urethra [Correct]
b) Bladder → Kidney → Ureter → Urethra
c) Urethra → Kidney → Bladder → Ureter
d) Kidney → Bladder → Ureter → Urethra
31. Which organism has a single opening for ingestion and egestion?
a) Earthworm
b) Hydra [Correct]
c) Frog
d) Cockroach
32. The main site of absorption of nutrients is:
a) Stomach
b) Large intestine
c) Small intestine [Correct]
d) Rectum
33. In plants, food is transported by:
a) Xylem
b) Phloem [Correct]
c) Stomata
d) Chloroplast
34. Blood circulation was discovered by:
a) Robert Hooke
b) William Harvey [Correct]
c) Newton
d) Einstein
35. Pepsin acts on:
a) Fats
b) Carbohydrates
c) Proteins [Correct]
d) Vitamins
36. Part of the brain that controls breathing:
a) Cerebellum
b) Cerebrum
c) Medulla [Correct]
d) Pons
37. Anaerobic respiration produces:
a) More energy
b) Alcohol or lactic acid [Correct]
c) Oxygen
d) Starch
38. Which structure connects mouth and stomach?
a) Trachea
b) Esophagus [Correct]
c) Larynx
d) Diaphragm
39. Which blood cell fights infection?
a) RBC
b) WBC [Correct]
c) Platelets
d) Plasma
40. Urine is stored in the:
a) Kidney
b) Ureter
c) Bladder [Correct]
d) Urethra
41. Site of absorption of glucose is:
a) Liver
b) Stomach
c) Small intestine [Correct]
d) Large intestine
42. Inhalation involves:
a) Relaxation of diaphragm
b) Diaphragm moving upward
c) Diaphragm flattening [Correct]
d) Lungs contracting
43. Food pipe is also called:
a) Larynx
b) Pharynx
c) Esophagus [Correct]
d) Trachea
44. Bile helps in digestion of:
a) Carbohydrates
b) Proteins
c) Fats [Correct]
d) Vitamins
45. The enzyme amylase breaks down:
a) Fats
b) Proteins
c) Carbohydrates [Correct]
d) Vitamins
46. Which part of nephron collects the filtered urine?
a) Glomerulus
b) Bowman's capsule
c) Tubule [Correct]
d) Ureter
47. Oxygen enters the blood through:
a) Trachea
b) Bronchi
c) Alveoli [Correct]
d) Lungs
48. Excretion in amoeba occurs through:
a) Food vacuole
b) Contractile vacuole [Correct]
c) Pseudopodia
d) Cytoplasm
49. Which part of the plant transports water?
a) Phloem
b) Xylem [Correct]
c) Chloroplast
d) Epidermis
50. Which blood vessel brings blood to kidneys?
a) Renal artery [Correct]
b) Renal vein
c) Hepatic vein
d) Aorta
