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Subhi, a class 6 student grouped together a few changes occurring around us as:
Group 1 : Blooming of flowers, breaking of glass, vaporisation of water, sawing of wood
Group 2 : Tides in the ocean, motion of a swing, landslides, occurrence of day and night
Group 3 : Rusting, germination of seeds, burning of fire crackers, growth of a child
Group 4 : Making a paper boat, blowing air into balloon, baking a roti, heating an iron rod
Select the odd one in each group and mention the property which makes it odd.
Group 1 | Group 2 | Group 3 | Group 4 | |
---|---|---|---|---|
A | Blooming of flowers (Physical change) |
Tides in the ocean (Periodic change) |
Rusting (Chemical change) |
Making a paper boat (Physical change) |
B | Breaking of glass (Irreversible change) |
Occurrence of day and night (Natural change) |
Germination of seeds (Irreversible change) |
Blowing air into balloon (Reversible change) |
C | Sawing of wood (Physical change) |
Motion of a swing (Periodic change) |
Growth of a child (Irreversible change) |
Heating an iron rod (Chemical change) |
D | Vaporisation of water (Reversible change) |
Landslides (Nonperiodic change) |
Burning of fire crackers (Fast change) |
Baking a roti (Chemical change) |
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Option which correctly identifies true (T) and false (F) ones.
(i) The seasonal movement of the complete population of animals from one area to another is termed migration.
(ii) Heavy and solid bones help penguins to swim through water at a speed up to 15 miles per hour.
(iii) Toucans have four clawed toes in each leg, two in front and two at the back.
(iv) Most rainforests lie between the Tropic of Cancer and the Tropic of Capricorn, that is why they are often called as tropical rainforests.
(i) | (ii) | (iii) | (iv) | |
---|---|---|---|---|
A | F | T | T | T |
B | T | T | F | T |
C | T | F | T | T |
D | F | F | F | T |