Life Processes
Punjab Board · Class 10 · Science
Flashcards for Life Processes — Punjab Board Class 10 Science. Quick Q&A cards covering key concepts, definitions, and formulas.
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Get startedWhat is the main difference between how we can identify living and non-living things?
Answer
Living things show molecular movements and carry out life processes (nutrition, respiration, transportation, excretion) to maintain their organized structure. Non-living things lack these organized pr…
Why must living organisms constantly move molecules around their bodies?
Answer
Living organisms are highly organized structures. Environmental effects constantly try to break down this organization. Molecular movements are needed to repair and maintain these organized structures…
Define autotrophic nutrition and give two examples of autotrophic organisms.
Answer
Autotrophic nutrition is the process by which organisms make their own food from simple inorganic materials (carbon dioxide and water) using an external energy source, usually sunlight. Examples: Gree…
What is heterotrophic nutrition? Name three types of heterotrophs.
Answer
Heterotrophic nutrition is when organisms obtain food by consuming complex organic materials made by other organisms. They cannot make their own food. Three types: (1) Herbivores - eat plants (e.g., c…
Write the balanced equation for photosynthesis and explain what each component does.
Answer
6CO₂ + 12H₂O + light energy (Chlorophyll) → C₆H₁₂O₆ + 6O₂ + 6H₂O Components: CO₂ = carbon source from atmosphere, H₂O = hydrogen source from soil, Chlorophyll = light energy absorber, Sunlight = ener…
A variegated leaf (with green and white areas) was kept in darkness for 3 days, then in sunlight for 6 hours. After starch testing with iodine, only the green areas turned blue-black. What does this p
Answer
This proves that chlorophyll is essential for photosynthesis. Only the green areas containing chlorophyll could perform photosynthesis and produce starch (which turns blue-black with iodine). The whit…
How do stomata help plants and what controls their opening and closing?
Answer
Stomata are tiny pores on leaf surfaces that allow massive gas exchange (CO₂ in, O₂ out) needed for photosynthesis. Guard cells surrounding each stoma control opening and closing. When water flows int…
Two identical plants were kept in sealed containers in sunlight. One container had potassium hydroxide (which absorbs CO₂), the other didn't. The plant without KOH had more starch. Explain this result
Answer
This proves that carbon dioxide is essential for photosynthesis. The plant in the container with KOH couldn't access CO₂ (it was absorbed), so it couldn't perform photosynthesis and produced minimal s…
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