Life Processes — Flashcards
Karnataka Board · Class 10 · Science
20 flashcards for Life Processes (Karnataka Board Class 10 Science) to test yourself on key terms and facts. Sample: "A plant kept in a dark room for 3.
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A plant kept in a dark room for 3 days shows no starch when tested with iodine. The same plant kept in sunlight for 6 hours shows starch presence. What does this demonstrate?
Answer
This demonstrates that photosynthesis requires light energy. In darkness, the plant uses up stored starch for respiration. In sunlight, photosynthesis occurs, producing glucose which is converted to s…
Why do we breathe faster during exercise than at rest?
Answer
During exercise, muscle cells need more energy, requiring increased oxygen for aerobic respiration. Carbon dioxide production also increases. Faster breathing ensures adequate oxygen supply and effici…
What happens when you blow air into lime water, and why does it turn milky faster with exhaled air than with atmospheric air?
Answer
Exhaled air contains more CO₂ (4%) than atmospheric air (0.03%). CO₂ reacts with lime water: Ca(OH)₂ + CO₂ → CaCO₃ + H₂O. The white precipitate (CaCO₃) forms faster with exhaled air due to higher CO₂ …
Define photosynthesis and write its balanced chemical equation.
Answer
Photosynthesis is the process by which green plants use sunlight, chlorophyll, carbon dioxide, and water to produce glucose and oxygen. 6CO₂ + 12H₂O + sunlight + chlorophyll → C₆H₁₂O₆ + 6O₂ + 6H₂O Th…
A fish opens and closes its mouth 60 times per minute while a human breathes 18 times per minute. Why this difference?
Answer
Dissolved oxygen in water is much lower than oxygen in air. Fish need faster breathing to extract sufficient oxygen from water through gills. The lower oxygen concentration requires higher water flow …
How do guard cells control the opening and closing of stomata?
Answer
Guard cells swell when water enters them, making stomata open for gas exchange during photosynthesis. When guard cells lose water and shrink, stomata close to prevent water loss. This mechanism allows…
Why does muscle pain occur during vigorous exercise?
Answer
During intense exercise, oxygen supply becomes insufficient for aerobic respiration. Muscles switch to anaerobic respiration, producing lactic acid instead of CO₂ and water. Lactic acid accumulation i…
What is the role of ATP in cellular processes?
Answer
ATP (Adenosine Triphosphate) is the energy currency of cells. Energy from respiration converts ADP + Pi to ATP. When cells need energy, ATP breaks down to ADP + Pi, releasing 30.5 kJ/mol. This energy …
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Sources & Official References
- Karnataka SSLC — kseeb.kar.nic.in
- Dept of Pre-University Education, Karnataka
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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