Biology · Class 10 CBSE
Riya eats a balanced meal before going for a long cycling trip. During the ride, her muscles require more energy than usual. Which life process directly provides this extra energy?
A plant is placed in sunlight but all its stomata are sealed with petroleum jelly. Which observation is most likely after a few hours?
A patient has damage to the alveoli in both lungs. Which activity will become most difficult?
A person has fewer red blood cells than normal. Which effect is most likely during physical activity?
A student compares arteries and veins. Which statement correctly explains why arteries have thicker walls?
If bile is not released into the small intestine, which nutrient will be affected the most during digestion?
During an experiment, one leaf is covered with black paper while another remains exposed to sunlight. After testing with iodine solution, what is the most likely observation?
A person drinks very little water for two days. How do the kidneys help maintain the body\'s water balance?
Which situation best demonstrates the importance of the circulatory system?
A runner\'s breathing rate remains high for a few minutes even after finishing a race. What is the best explanation?
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A student says, \"Plants do not respire because they prepare their own food.\" Do you agree? Give two reasons to justify your answer.
2 marksA patient has a blockage in one coronary artery. Explain how this may affect the functioning of the heart.
2 marksWhy are villi present in the small intestine instead of the stomach? Explain with reference to their function.
2 marksTwo students perform the starch test on a leaf. Student A keeps the plant in sunlight. Student B keeps the plant in darkness. Predict the result and explain the reason.
2 marksWhy is the transport system necessary in multicellular organisms but not in Amoeba?
2 marksDuring a health check-up, doctors find that a person has unhealthy lungs due to years of smoking. Explain: - How gas exchange normally takes place in alveoli. - How smoking damages this process. - Why the person experiences breathlessness during exercise.
5 marksFood passes through several organs before nutrients finally reach body cells. Describe the journey of food from the mouth to the small intestine. Explain the role of each organ involved in digestion and absorption.
5 marksCase study: Rahul participates in a school marathon. During the race, his heartbeat and breathing rate increase significantly. After drinking water and resting for some time, both gradually return to normal. Answer the following: (a) Why does Rahul\'s breathing rate increase during the race?
1 markCase study: Rahul participates in a school marathon. During the race, his heartbeat and breathing rate increase significantly. After drinking water and resting for some time, both gradually return to normal. Answer the following: (b) Which body system transports oxygen to his muscles?
1 markCase study: Rahul participates in a school marathon. During the race, his heartbeat and breathing rate increase significantly. After drinking water and resting for some time, both gradually return to normal. Answer the following: (c) Why do muscle cells require more oxygen during running?
1 markCase study: Rahul participates in a school marathon. During the race, his heartbeat and breathing rate increase significantly. After drinking water and resting for some time, both gradually return to normal. Answer the following: (d) Explain why Rahul\'s heartbeat gradually returns to normal after resting.
1 mark