Track quiz
Twelve quick questions. Use the table if you get stuck.
| Lesson | The rule |
|---|---|
| Makes its own food | A plant makes its own food from carbon dioxide, water and sunlight. |
| Four needs | A leaf needs sunlight, carbon dioxide, water and chlorophyll to make food. |
| Leaf parts | Chlorophyll catches sunlight. Stomata let gases in and out. |
| Starch test | Iodine turns blue-black where there is starch. |
| Roots | Roots take in water. Minerals dissolved in it come too. |
| Two tubes | Xylem carries water and minerals up. Phloem carries food to every part. |
| Food stores | The leaf makes the food. Phloem carries it to the store. |
| Respiration | Photosynthesis makes food. Respiration releases the energy in it. |
| Growth | A plant needs sunlight and water to grow well. Without water it wilts. In the dark it turns pale and weak. |
| Carbon dioxide | Caustic soda takes in carbon dioxide from the air. A leaf with no carbon dioxide makes no starch. So the leaf needs carbon dioxide. |
| What comes out | A leaf in sunlight gives out oxygen. It also makes glucose, a sugar for quick energy. Extra glucose is stored as starch. |
| Coloured leaves | Many red and purple leaves have chlorophyll too. Other pigments hide the green. A leaf with chlorophyll can make food in light. |
Which gas does a leaf take in to make food?
A green leaf sits in sunlight. It has no carbon dioxide. What does it make?
Which part of a leaf catches sunlight?
Iodine is added to a leaf that made starch. What colour appears?
What do roots take in?
Which tubes carry water up from the roots?
You test a slice of potato with iodine. It turns blue-black. Which part of the plant made the food?
What does respiration do with glucose?
A young plant in sun gets no water for two weeks. What does it do?
Box X holds caustic soda. Box Y holds plain water. Both plants stand in sunlight. Why does the plant in box X make no starch?
A water plant sits in sunlight. Tiny bubbles rise from its leaves. Which gas is in them?
A plant has purple leaves. Can it make food?
Chapter 10 of your NCERT book is Life Processes in Plants. Read it this week.
Next: Light: Shadows and Reflections.