Q1. What would be the likely consequence if a person's lymphatic system were severely impaired?A Increased oxygen transport to tissues. B Enhanced digestion and absorption of fats. C Reduced blood pressure due to lower blood volume. D Accumulation of tissue fluid (edema) and impaired immune response. View full solution →
Q2. A student performs an experiment to study photosynthesis. They keep a potted plant with variegated leaves (some parts green, some non-green) in a dark room for 48 hours and then expose it to sunlight for 6 hours. After performing the iodine test, which part of the leaf would show the presence of starch and why?A Neither part, as the plant was kept in the dark for too long. B Only the non-green parts, because they store starch more efficiently. C Only the green parts, because they contain chlorophyll necessary for photosynthesis. D Both green and non-green parts, as starch is transported throughout the leaf. View full solution →
Q3. What would be the effect on digestion if the pancreas failed to secrete its digestive enzymes?A The digestion of carbohydrates, proteins, and fats would be severely impaired. B Only protein digestion would be affected. C Bile production would cease, affecting fat digestion. D Only carbohydrate digestion would be affected. View full solution →
Q4. Which of the following processes in plants requires energy (ATP) for the movement of substances?A Diffusion of gases through stomata. B Translocation of food in phloem. C Transpiration pull of water in xylem. D Osmosis of water into root cells. View full solution →
Q5. How do terrestrial plants exchange gases for respiration?A Only through specialized respiratory organs similar to gills. B Through stomata in leaves, and lenticels in woody stems. C Through the entire surface area of roots, stems, and leaves. D Through lenticels only. View full solution →
Q6. Assertion (A): Human beings have a double circulatory system. Reason (R): In a double circulatory system, blood goes through the heart twice during each cycle, once for pulmonary circulation and once for systemic circulation.A Both A and R are true, but R is not the correct explanation of A. B Both A and R are true, and R is the correct explanation of A. C A is true, but R is false. D A is false, but R is true. View full solution →
Q7. Assertion (A): Anaerobic respiration releases less energy than aerobic respiration. Reason (R): In anaerobic respiration, glucose is not completely broken down in the absence of oxygen.A A is true, but R is false. B A is false, but R is true. C Both A and R are true, but R is not the correct explanation of A. D Both A and R are true, and R is the correct explanation of A. View full solution →
Q8. A person suffers from a condition where their blood is unable to clot effectively after an injury. Which component of the blood is most likely deficient or malfunctioning?A Red blood cells B Plasma C Platelets D White blood cells View full solution →
Q9. Which of the following is an example of an endothermic organism?A Snake B Human C Frog D Fish View full solution →
Q10. Why is it essential for plants to have stomata?A To exchange gases (CO2 and O2) and regulate water loss. B To absorb sunlight for photosynthesis. C To transport water and minerals from roots to leaves. D To release excess water in liquid form (guttation). View full solution →
Q11. Why is the left ventricle of the human heart thicker and more muscular than the right ventricle?A To pump oxygenated blood to the entire body against high resistance. B To prevent the backflow of blood into the atria. C To accommodate a larger volume of blood. D To pump blood to the lungs with less pressure. View full solution →
Q12. What happens to excess amino acids in the human body?A They are used to synthesize new proteins immediately. B They are converted into urea and excreted by the kidneys. C They are stored in the liver for future use. D They are converted into glucose and used for energy. View full solution →
Q13. Name the substance that prevents blood clotting inside the human body.A Heparin B Fibrinogen C Prothrombin D Thrombin View full solution →
Q14. Why do aquatic organisms breathe much faster than terrestrial organisms?A The concentration of dissolved oxygen in water is much lower than in air. B Aquatic organisms have a higher metabolic rate. C Their gills are less efficient than lungs in extracting oxygen. D They need to expel more carbon dioxide from their bodies. View full solution →
Q15. A student observes a plant kept in a sealed transparent container. After some time, droplets of water appear on the inner surface of the container. What biological process is demonstrated here?A Transpiration B Respiration C Photosynthesis D Absorption View full solution →
Q16. What would happen if the epiglottis failed to function properly during swallowing?A Food would enter the trachea (windpipe). B Digestion in the mouth would be impaired. C Air would enter the esophagus. D Food would enter the stomach too quickly. View full solution →
Q17. What is the consequence of consuming alcohol on the functioning of the liver?A Improved regulation of blood sugar levels. B Damage to liver cells, potentially leading to fatty liver, cirrhosis, or hepatitis. C Enhanced protein synthesis and detoxification. D Increased production of digestive enzymes. View full solution →
Q18. Which of the following statements correctly describes the role of bile in the digestion of food?A Bile absorbs nutrients directly from the small intestine into the bloodstream. B Bile emulsifies fats in the small intestine, increasing their surface area for enzyme action. C Bile contains enzymes that digest proteins in the stomach. D Bile neutralizes the acidic chyme coming from the stomach in the large intestine. View full solution →
Q19. Which of the following is the correct sequence of parts through which urine passes in the human excretory system?A Kidney -> Ureter -> Bladder -> Urethra B Kidney -> Bladder -> Ureter -> Urethra C Urethra -> Bladder -> Ureter -> Kidney D Bladder -> Ureter -> Kidney -> Urethra View full solution →
Q20. Which component of blood is responsible for defending the body against infections?A Plasma B White blood cells C Red blood cells D Platelets View full solution →