Buffyyour study buddyHi! Ask me about photosynthesis, transport in plants, or why plants respire.
Buffy is an AI helper and can be wrong — always check your NCERT textbook.
A green leaf is a tiny solar-powered kitchen. Turn the sunlight up and down, take away water or air, and watch the plant start — and stop — making oxygen.
Play with it
Slide the sunlight up and the leaf makes more food and releases more oxygen. Switch off water or carbon dioxide and photosynthesis stops — every raw material is needed.
Learn
Green plants make their own food by photosynthesis. In the leaves, the green pigment chlorophyll traps sunlight and uses it to turn raw materials into food:
carbon dioxide + water — sunlight / chlorophyll → glucose + oxygen
Like all living things, plants respire — they take in oxygen and release carbon dioxide — all the time, day and night.
Worked example. A plant is kept in a dark cupboard for a week. Why do its leaves turn pale and the plant grow weak?
No light ⇒ no photosynthesis ⇒ the plant can't make food. It uses up its stores, the chlorophyll fades, and the leaves turn pale.
Where you'll meet it
Plants are the only living things that make food from sunlight. Every animal — and every meal you eat — traces back to a plant's photosynthesis.
The oxygen released by forests, grasslands and ocean plants is what fills the air we breathe. Protecting green cover protects our oxygen.
Check yourself
Modelled on the competency-based pattern — MCQ, assertion–reason and a case study, testing whether you can use the ideas, not just recall them.
Interactive built to the OpenMAIC approach (THU-MAIC, MIT). Content from the NCERT Class 7 Science textbook, Curiosity (ncert.nic.in).
Buffyyour study buddyBuffy is an AI helper and can be wrong — always check your NCERT textbook.