Natural Processes and Biogeochemical Cycles — Flashcards
ICSE · Class 9 · Environmental Science
52 flashcards for Natural Processes and Biogeochemical Cycles (ICSE Class 9 Environmental Science) to test yourself on key terms and facts.
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Why do green plants need sunlight for photosynthesis?
Answer
Sunlight provides the light energy needed to start photosynthesis. Chlorophyll in chloroplasts absorbs this light energy and uses it to make food in the form of glucose.
What is photosynthesis?
Answer
Photosynthesis is the biological process by which green plants use carbon dioxide and water in the presence of sunlight to prepare their food in the form of glucose, releasing oxygen as a by-product.
Where does photosynthesis take place in a plant cell?
Answer
Photosynthesis takes place in chloroplasts, which contain chlorophyll. Chlorophyll is a green pigment that absorbs sunlight.
What are the three main stages of photosynthesis?
Answer
The three main stages are: 1) absorption of light energy, 2) conversion of light energy into chemical energy, and 3) reduction of carbon dioxide to form glucose.
What happens during photolysis in photosynthesis?
Answer
During photolysis, water molecules split into hydrogen and oxygen. The oxygen is released, and the hydrogen is used in the next stage to help form glucose.
Why does oxygen come out of leaves during photosynthesis?
Answer
Oxygen released during photosynthesis exits through the stomata, which are tiny openings on the leaf surface.
What happens to extra glucose made by plants?
Answer
Excess glucose from photosynthesis is stored as starch in plants.
How does light intensity affect photosynthesis?
Answer
Higher light intensity increases the rate of photosynthesis up to a certain limit. After that, another factor may become limiting.
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