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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
State whether the following is physical or chemical changes.
growing of a piglet into a pig —
True or false
Is melting of ice a reversible change?
True or false
In a physical change no net energy change is involved.
True or false
Dissolving of a solid in liquid is a physical change.
Photosynthesis cannot take place at night.
A change in which matter undergoes a change but the total mass of the substance is unaltered is a ______ change.
When ice melts to form water, change occurs in its
Match the following
| Sr. No. | A | B | C |
| 1. | Melting | Change of state from liquid to solid | Ticking of clock |
| 2. | Condensation | Change of state from liquid to gas | Formation of ice cube |
| 3. | Evaporation | Change of state from solid to liquid | Collecting flowers |
| 4. | Freezing | Change of state from gas to liquid | Ice cube to water |
| 5. | Periodic change | Occurs at irregular time intervals | Water to steam |
| 6. | Non-periodic change | Occurs at regular time intervals | Steam to water drops |
Fill in the blanks in the following statements using the words given in the box.
| rusted, colourful, substance, chemical, physical, reversible, iron oxide, object |
- Making sugar solution is a ______ change.
- A physical change is generally ______.
- Grinding of wheat grain changes its size. It is a ______ change.
- Iron benches kept in lawns and gardens get ______. It is a ______ change because a new ______ is formed.
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
