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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:
Burning of paper and wood
Ripening of fruits is a desirable change.
Write short answer.
Give two examples of periodic changes
Write short answer.
Sublimation is classified as a physical change. Why ?
Which of the following are physical changes and which are chemical changes?
Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper.
Give four difference between physical and chemical changes.
State whether the following statement is true or false. If false write the correct statement.
Melting of ice is an exothermic, irreversible chemical change.
Select the correct answer from the choice given below to complete the sentence
A change in which a substance retains its identity is a
______ change.
Match the examples of changes in List I with the correct type of change in List II.
| List I | List II |
| 1. Burning of paper | A: Physical change |
| 2. The ringing of an electric bell | B: Chemical change |
| 3. Curdling of milk | |
| 4. Electric light is switched on | |
| 5. Melting of butter |
Give two examples for the following case:
Physical changes which are reversible
