Life Processes
Meghalaya Board · Class 10 · Science
Flashcards for Life Processes — Meghalaya Board Class 10 Science. Quick Q&A cards covering key concepts, definitions, and formulas.
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Get startedWhy do we breathe faster during exercise compared to when we're resting?
Answer
During exercise, muscles need more energy and produce more ATP. This requires increased oxygen intake and faster removal of carbon dioxide. The breathing rate increases to meet these higher oxygen dem…
What is photosynthesis and why is it essential for life on Earth?
Answer
Photosynthesis is the process by which plants convert carbon dioxide and water into glucose using sunlight and chlorophyll. Chemical equation: 6CO₂ + 12H₂O → C₆H₁₂O₆ + 6O₂ + 6H₂O. It's essential becau…
How does the digestive system break down a chapati you eat into usable nutrients?
Answer
1. Mouth: Salivary amylase breaks starch into simple sugars 2. Stomach: Pepsin begins protein digestion in acidic environment 3. Small intestine: Pancreatic enzymes complete breakdown - carbohydrates …
Why do fish die when taken out of water while they can survive in water with dissolved oxygen?
Answer
Fish have gills adapted to extract dissolved oxygen from water. Their gill filaments have large surface area and thin walls for efficient gas exchange. In air, gills collapse and stick together, preve…
What happens to the rate of photosynthesis if you cover half the leaves of a plant with black paper?
Answer
The rate of photosynthesis decreases significantly. The covered leaves cannot receive sunlight, so they cannot perform photosynthesis. Only the uncovered leaves can photosynthesize, reducing the overa…
How does the heart ensure that oxygenated and deoxygenated blood don't mix?
Answer
The heart has four chambers: two atria (upper) and two ventricles (lower). The right side handles deoxygenated blood (to lungs), left side handles oxygenated blood (to body). Valves prevent backflow, …
Why do tall trees need a transportation system while small plants can survive by simple diffusion?
Answer
In tall trees, the distance between roots (water/mineral absorption) and leaves (food production) is very large. Simple diffusion is too slow for long distances. Xylem and phloem provide efficient tra…
What is the difference between aerobic and anaerobic respiration?
Answer
Aerobic respiration uses oxygen, occurs in mitochondria, produces 38 ATP molecules, and creates CO₂ + H₂O as waste. Anaerobic respiration occurs without oxygen, in cytoplasm, produces only 2 ATP molec…
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