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Question
Tick the most appropriate answer.
Photosynthesis requires
Options
heat energy
wind energy
sunlight
sound energy
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Solution
sunlight.
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RELATED QUESTIONS
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
State the various conditions that favour the process of evaporation.
What role does energy play in initiating a chemical change ?
Tick the most appropriate answer.
Rising and setting of the sun at a given place is a
Write true or false
Decomposition of leaves is a fast change.
Which of the following are physical changes ?
- melting of iron metal
- rusting of iron metal
- bending of an iron rod
- drawing a wire of iron metal
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible 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 |
What is the difference between dissolution of sugar and burning of sugar ?
A physical change is generally____________.
