Solve this crossword by using the clues that follow Across 1. Energy in the form of sunlight is absorbed by the green plants in this process

Question

Solve this crossword by using the clues that follow

(a) Across

1. Energy in the form of sunlight is absorbed by the green plants in this process.

2. The reddish-brown substance formed over iron in the presence of oxygen and moisture.

3. This change is permanent and irreversible.

4. The process in which a solid directly changes into gaseous state.

Down

1 . It is the change that takes place in case of swinging pendulum of a clock. –

1. Occurrence of this is a non-periodic change as well as a natural change.

2. It is a physical change.

(b) Make a list of different types of changes with example.

Answer 1

(a)

(b) Different types of changes are as under :

1. Reversible Change e.g. Melting of ice.

2. Irreversible Change e.g. Burning of paper.

3. Periodic Change e.g. Swinging of pendulum.

4. Non-Periodic Change e.g. Occurrence of floods.

5. Desirable Change e.g. Ripening of fruits.

6. Undesirable Change e.g. Rusting of Iron.

7. Natural Change e.g. Changing of Seasons

8. Man-Made Change e.g. Changing the direction of flow of a river by dams.

9. Slow Change e.g. Growth of a plant

10.Fast Change e.g. Occurrence of lightning during thunderstorm.

1. Physical Change e.g. transformation of ice

12.. Chemical Change e.g. curdling of milk.