Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of
Assertion (A).
(c) Assertion (A) is true but Reason (R) is false.
(d) Assertion (A) is false but Reason (R) is true
Q.1. Assertion (A) : Plants lack excretory organs.
Reason (R) : Plants usually absorb essential nutrients.
Answer(b)
Q.2. Assertion (A) : In anaerobic respiration, one of the end product is alcohol.
Reason (R) : There is an incomplete breakdown of glucose.
Answer(a)
Q.3. Assertion (A) : In plants there is no need of specialised respiratory organs.
Reason (R) : Plants do not have great demands of gaseous exchange.
Answer(a)
Q.4. Assertion (A) : Bile is essential for digestion of lipids.
Reason (R) : Bile juice contains enzymes.
Answer(c)
Q.5. Assertion (A) : Carbohydrate digestion mainly takes place in small intestine.
Reason (R) : Pancreatic juice contains the enzyme lactase.
Answer(c)
Q.6. Assertion (A) : Aerobic respiration requires less energy as compared to anaerobic respiration.
Reason (R) : Mitochondria is the powerhouse of the cell.
Answer(d)
Q.7. Assertion (A): Arteries are thick-walled and elastic in nature.
Reason (R) : Arteries have to transport blood away from the heart.
Answer(b)
Q.8. Assertion (A) : Human heart is four-chambered.
Reason (R) : Vena cava is the only artery that supplies deoxygenated blood to the heart.
Answer(c)
Q.9. Assertion (A): Energy is required to carry out different life processes.
Reason (R) : Energy is obtained in the form of ATP in the mitochondria.
Answer(a)
Q.10. Assertion (A): Rings of cartilage are present in the throat,
Reason (R) : These ensure that the air-passage does not collapse
Answer(a)
Q.11. Assertion (A): Pyruvate is a six-carbon molecule
Reason (R) : It is prepared in the cytoplasm as the first step to cellular respiration
Answer(d)
Q.12. Assertion (A): Molecular movements are needed for life.
Reason (R): Body structures made up of these molecules need continuous repair and maintenance
Answer(a)
Q.13. Assertion (A): Diffusion does not meet high energy requirements of multi-cellular organisms
Reason (R) : Diffusion is a fast process but occurs at the surface of the body.
Answer(c)
Q.14. Assertion (A): The opening and closing of the pore is a function of the guard cells.
Reason (R) : Stomatal pores are the site for exchange of gases by diffusion.
Answer(b)
Q.15. Assertion (A): The purpose of making urine is to filter out undigested food from intestine
Reason (R): Kidneys filter the waste and produce urine,
Answer(d)
Q.16. Assertion (A): The inner lining of the small intestine has numerous finger-like projections called villi.
Reason (R) : The villi increase the surface area for absorption.
Answer(a)
Q.17. Assertion (A): In human beings, the respiratory pigment is haemoglobin
Reason (R) : It is a type of protein which has high-affinity carbon dioxide.
Answer(c)
Q.18. Assertion : The plants store some of the waste products in their body parts.
Reason: Raphides are the solid waste products of plants.
Answer(b)
Q.19. Assertion : The movement of water and dissolved salts in xylem is always upwards.
Reason: ‘The upward movement of water is due to low pressure created by transpiration.
Answer(a)
Q.20. Assertion : Photosynthesis takes place in green parts of the plants.
Reason: Photosynthesis always takes place in leaves.
Answer(c)
Q.21. Assertion: The average number of heart beat of a person at rest is about 80 per minute.
Reason: One contraction and relaxation of the heart constitutes a complete heart beat.
Answer(d)
Q.22. Assertion : Ureters are the tubes which carry urine from kidneys to the bladder.
Reason: Urine is stored in the urethra.
Answer(c)
Q.23. Assertion : Ventricles have thicker walls than auricles.
Reason: Ventricles have to pump blood into various organs with great pressure
Answer(a)
Q.24. Assertion : Capillaries are the thinnest blood vessels.
Reason: Capillaries connect the branches of arteries and veins.
Answer(b)
Q.25. Assertion : Blood takes up oxygen from the alveolar air and release CO2 during exchange.
Reason: ‘The concentration of O, is more in alveolar air.
Answer(b)
Q.26. Assertion: The large intestine is the largest part of the alimentary canal.
Reason: Tiger has a shorter small intestine, than herbivores.
Answer(d)
Q.27. Assertion : Most of the living organisms carry out aerobic respiration.
Reason: Mitochondria is the site of aerobic respiration in the cell.
Answer(b)
Q.28. Assertion : The Bowman’s capsule and the tubule together make a nephron.
Reason : The function of tubule is to allow the selective reabsorption of substances like glucose, amino
acids, urea, salts and water into the blood capillaries.
Answer(c)
Q.29. Assertion : Pancreatic juice digests starch, proteins and fats.
Reason: Pancreatic juice contains digestive enzymes like pancreatic amylase, trypsin and lipase.
Answer (a)
Q.30. Assertion: The accumulation of lactic acid in the muscles causes muscle cramps.
Reason: During vigorous physical exercise leg muscles respire anaerobically.
Answer(a)
Q.31. Assertion : Phloem helps in translocation of food from the leaves.
Reason: Phloem provides mechanical support to plant.
Answer(c)
Q.32. Assertion : Trachea does not collapse, when there is no air in it.
Reason : Trachea is supported by cartilage.
Answer(a)
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