Answer: Option A. -> Reversible change
:
A

A reversible change is a change which can be undone. Always ask yourself, "Will the reverse happen?"

It's always fun to make a paper boat out of paper. If you take a sheet of paper and fold it to make a boat, you have changed the shape of the paper. So, will the reverse happen? Yes, uou can easily unfold the boat to get the sheet of paper back. This is a reversible change. 

Answer: Option C. -> Cutting of trees
:
C
Changes which can't be reversed or undone are called irreversible changes.
Structures made from sand can be broken down and we can obtain sand. 
Paper planes can be unfolded and we can get back the paper in its initial state.
Ice can also change its form to water and can be converted back to ice on cooling. So they are reversible changes. 
But after cutting a tree it can't be put back in its previous state. So it is an irreversible change.

Answer: Option A. -> baked bread cannot be converted back to flour
:
A

Once baked, the bread cannot be converted back to flour by the addition of water or by cooling it. Hence, it is an irreversible change. 

Answer: Option A. -> reversible
:
A

From the figure, it is clear that water on freezing becomes ice and ice on melting becomes water.
So, both the states can be achieved by heating and cooling.
Hence, the given figure shows a reversible change.

Answer: Option B. -> False
:
B

Reversible changes are changes which can be undone. When we burn a piece of paper it turns into ash. We cannot get the paper back from the ash. Hence, it is an irreversible change.

Answer: Option A. -> It is an irreversible change.
:
A
Changes which can't be reversed are called irreversible changes.
After curd is formed, it cannot be converted back to milk, because its chemical composition is changed during the process. So, this change is an irreversible change.

Answer: Option B. -> False
:
B
Once sugarcane is processed to make sugarcane juice, it is not possible to get back the raw sugarcane in its original form. Hence, this is an irreversible change.

Answer: Option A. -> reversible
:
A

Melting of an  ice cream is a  reversible change. The molten ice cream can be frozen back to get cold delicious ice cream.

Answer: Option A. -> reversible
:

Anything that may undergo different look, composition, colour, position, size or shape due to some factor internal or external is called change. Changes may be permanent or temporary.

Answer: Option A. -> reversible
:

Statement: 1 Mark
Type of change: 2 Marks
No, Once the wood is burned, it changes to ash, and we cannot get back the wood again.This is because burning wood is an irreversible change, and irreversible changes cannot be undone since they are permanent.