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Subjects

Science

Life Processes

In this Class 10 Science topic from the chapter “World of Living,” students explore the essential processes that keep organisms alive and functioning. They learn how plants and animals obtain and use nutrition, release energy through respiration, transport substances such as water, minerals, gases and food, and remove metabolic wastes through excretion. The topic connects these ideas with photosynthesis and the roles of major human body systems, helping students understand how living organisms maintain life through coordinated biological activities.

Expert · Level 1 · 25 questions

Practice questions

01If a leaf receives enough light but its stomata remain closed for a long time, why can the rate of photosynthesis decrease?

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02How does the opening and closing of stomata help a plant balance two competing needs?

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03What is the main function of the green pigment in photosynthesis?

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04Which plant tissue transports sugars made in the leaves to the roots and other parts of the plant?

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05How do leaves help move water upward through the xylem?

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06In autotrophic nutrition, what major product is formed using carbon dioxide and water during photosynthesis?

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07Formation of pseudopodia in Amoeba is most closely related to which step of nutrition?

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08What movement pushes food forward through the human alimentary canal?

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09Starch digestion begins in the mouth. Why does the action of the salivary enzyme become limited in the stomach?

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10What balance is shown by the presence of acid and mucus in the stomach?

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11Why does bile help with fat digestion even though it is not an enzyme?

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12What is the strongest reason for considering the small intestine the main site of digestion and absorption?

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13Villi and alveoli are in different organs, yet what similar principle do they use?

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14Why is it correct to link the large intestine with water balance rather than with most digestion?

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15Why is it important to distinguish breathing from cellular respiration?

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16Why does aerobic respiration release more energy than anaerobic respiration?

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17Why can lactic acid form in muscles during heavy exercise?

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18What is the combined advantage of having many alveoli with thin walls?

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19Why can a low haemoglobin level cause tiredness and breathlessness?

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20How is the human heart’s four-chambered structure linked to the body’s high energy requirement?

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21Why is double circulation considered more effective than single circulation?

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22How do thick artery walls and valves in veins suit their functions?

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23Why are capillaries better suited than arteries for the exchange of substances between blood and tissues?

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24Why is lymph considered a supporting part of the circulatory system?

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25What is the main difference between the driving forces for human blood transport and water transport through plant xylem?

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