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प्रश्न
Photosynthesis cannot take place at night.
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उत्तर
Photosynthesis requires sunlight which is not available at night time. Therefore the process stops at night.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Dissolving common salt in water.
Fill in the blank.
Heat is .................... by a gas during the process of condensation.
Write true or false for the statement
Decomposition of leaves is a fast change.
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
State the various conditions that favour the process of evaporation.
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
Classify the following as a physical or a chemical change.
Manufacture of salt from sea water
Differentiate between a physical change and a chemical change with reference to – Energy change taking place during the respective change.
Match the examples of changes in List I with the correct.
| List I | List II |
| 1. Expansion of a steel rod on heating | A: Physical change |
| 2. Rotting of eggs | B: Chemical change |
| 3. Milk turning sour | |
| 4. Tarnishing of copper | |
| 5. Separation of naphthalene from a mixture of naphthalene and sodium chloride. |
Digestion of food is a physical change.
