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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:
Rusting of almirah
Fill in the blank
change in which the substance can be brought back to its original state is called a ............... change.
Write short answer.
Give an example of desirable change which can also be undesirable
Tick (√) the correct alternative from the choice given for the following statement.
An example of both physical and chemical change is
Write true or false
A natural change can also be a desirable change.
Fill in the blanks with the appropriate words of the statement given below:
Heating a piece of iron is considered a __________ change while heating a piece of coal [carbon] is considered 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 |
You are given some candle wax. Can you make a candle doll from it? What kind of change is this?
Ice, water and water vapour look different and display different ______ properties but they are ______ the same.
Which of the following is not a physical change?
