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Subject :NSO    Class : Class 7

The polar bear has some adaptive features to live in extremely cold climate of polar regions.
Some are given in the box.

Select the correct adaptation values of the features P, Q and R from the following:
(i) Helps in catching the prey
(ii) Helps in high speed running
(iii) Insulates the body
(iv) Makes it a good swimmer
(v) Reduces heat loss
(vi) Makes it walk on snow easily
(vii) Sensitive hearing

A P → (v), Q → (vii), R → (ii)
B P → (iv), Q → (iii), R → (i)
C P → (iii), Q → (v), R → (vi)
D P → (iii), Q → (i), R → (ii)


I have a question, how can small ears help in reducing heat loss?

Ans 1:

Class : Class 7
P-(iii),Q-(v),R-(vi)

Ans 2:

Class : Class 7
Small ears have less blood vessels. Blood vessels help radiate heat from the body. So less blood vessels in the small ears help reduce heat loss.

Ans 3:

Class : Class 8
Big ears will have a comparatively more blood supply. So it will have more heat loss also.

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8
A OPTION

Ans 2:

Class : Class 7
The answer is option A, I think

Ans 3:

Class : Class 7
Option A is the correct option.

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Subject :NSO    Class : Class 3

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7

Ans 2:

Class : Class 7

Ans 3:

Class : Class 8
Answer is B

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 6

Mark the incorrect statement.

A Melting of wax is a physical change while burning of wax in a candle is a chemical change.
B Metals expand on heating while contract on cooling. Both are physical changes.
C Composition of matter changes during a chemical change while it remains same during a physical change.
D High and low tides in sea are the examples of non-periodic changes while growth of a tree is a periodic change.


Ans 1:

Class : Class 6
Option d is correct right can anyone explain the correct answer given

Ans 2:

Class : Class 6
Option d is correct

Ans 3:

Class : Class 7
Option D is incorrect

Ans 4:

Class : Class 6
D is the correct answer because the revolution of moon around the earth causes high tides and low tides and tree doesn't grow everyday.

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8
Option C

Ans 2:

Class : Class 8
Option C

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