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

Answer: Option C. -> Both reversible and irreversible
:
C
A paper boat can be made from a paper and then by unfolding it, it can be converted back to the same paper. Thus this isa reversible change. Whereas when a plane drawn on a paper is cut out, then it cannot be put back at the same position, this change is permanent. Hence this change is irreversible.

Answer: Option A. -> reversible
:
A
Melting of an ice cream is a reversible change. The moltenice cream can be frozen back to get cold delicious ice cream.

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 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.

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Statement: 1 Mark
Type ofchange: 2Marks
No, Once the wood is burned, it changes toash,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.

:
Each change : 1 Mark
Any three -
1. Shedding of leaves
2. Ripening of fruits
3. Growth of the body
4. Blooming of flowers

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Process : 1 Mark
Type of change : 1 Mark
Reason :1 Mark
When vinegar is mixed with bicarbonate of soda, the release of carbon dioxide gas is seen in the form of bubbles. We cannot get back our original substances since it is an irreversible change.