Life Processes — Flashcards
Gujarat Board · Class 10 · Science
28 flashcards for Life Processes (Gujarat Board Class 10 Science) to test yourself on key terms and facts. Sample: "Define life processes and explain why.
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Define life processes and explain why they are necessary for living organisms.
Answer
Life processes are the maintenance functions that living organisms must continuously perform to stay alive and healthy. They are necessary because the organized structures of living organisms constant…
What is the difference between autotrophic and heterotrophic nutrition?
Answer
Autotrophic nutrition: Organisms make their own food using simple inorganic materials (CO₂ and water) and sunlight. Examples: green plants, algae, photosynthetic bacteria. Products: glucose and oxygen…
A potted plant with variegated leaves is kept in darkness for 3 days, then in sunlight for 6 hours. After treating the leaf with iodine solution, blue-black color appears only in the green areas. What
Answer
This experiment (Activity 5.1) demonstrates that chlorophyll is essential for photosynthesis: 1. Darkness removes all starch from the plant (it gets used up) 2. In sunlight, only the green areas (con…
Write the equation for aerobic respiration and identify where each stage occurs in the cell.
Answer
Aerobic Respiration Equation: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy (ATP) Stages and locations: 1. Glycolysis: Cytoplasm - Glucose (6C) broken down to Pyruvate (3C) 2. Krebs Cycle (Citric Acid Cycle):…
A student blows air through lime water and observes it turns milky in 15 seconds. The same air is passed through using a syringe and takes 3 minutes to turn milky. What can you conclude?
Answer
Observation Analysis (Activity 5.4): Lime water turns milky due to CO₂ + Ca(OH)₂ → CaCO₃ (white precipitate) Conclusion: Exhaled breath contains much more CO₂ than atmospheric air. Reason: - Exhal…
Why do muscle cells produce lactic acid during intense physical activity, and what are the consequences?
Answer
During intense exercise: Problem: Oxygen supply cannot keep up with high energy demand in muscles Response: Muscles switch to anaerobic respiration: Glucose → Pyruvate → Lactic Acid (instead of CO₂ …
Describe the structure of the human alimentary canal and name the functions of each major region.
Answer
Human Alimentary Canal Structure (mouth → anus): 1. Mouth: Mechanical digestion (chewing), chemical digestion begins (salivary amylase breaks starch), saliva lubricates food 2. Esophagus: Transports…
A student adds saliva to starch solution and after 30 minutes adds iodine. No blue-black color appears. In a control tube without saliva, blue-black color appears immediately. What does this prove?
Answer
Experimental Analysis (Activity 5.3): Observation: - Saliva tube: NO blue-black color (iodine-starch test negative) - Control tube: Blue-black color (starch present) Proof: Salivary amylase enzyme c…
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