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Subject :NSO    Class : Class 4

A scientist observed a sudden increase in the number of algae in a lake over a few days. The reason behind it could be that ____________.

AWater cycle in the area got unbalanced
BElectronic wastes were being dumped in a nearby area
CA factory with heavy smoke discharge has been established nearby
DHeavy amount of chemical fertilisers were being used in a nearby field


Option d As heavy amount of chemicals fertilizers were being used in a nearby fiel

Ans 1: (Master Answer)

Class : Class 1

D


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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 9
C is the answer

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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 2

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Subject :NSO    Class : Class 7

Refer to the given Venn diagram and select the correct statements regarding animals X, Y and Z.

(i) Y can close its nostrils and remain underwater for long duration.
(ii) X possess glands under the eyes that help the body to get rid of excess salt.
(iii) Blubber is present under the skin of X and Z which protects them from cold.
(iv) X and Y are adapted to live in extremely cold climate of polar regions.
(v) Y live in groups and huddle together to keep themselves warm.
(vi) Z camouflage with the surrounding to avoid predators.

A (i), (ii), (iv) and (vi) only
B (i), (iii), (iv), (v) and (vi) only
C (ii), (iii), (iv) and (v) only
D (i), (ii), (iii) (iv), (v) and (vi)


Ans 1:

Class : Class 8

Ans 2:

Class : Class 7

Ans 3:

Class : Class 8

Ans 4:

Class : Class 8

Ans 5:

Class : Class 7

Ans 6:

Class : Class 8

Ans 7:

Class : Class 8

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 4
ccccc

Ans 2:

Class : Class 4
c

Ans 3: (Master Answer)

Class : Class 1

C

S could be insects, so they can possess six legs. R can be birds, they possess only two legs. So, this statement is incorrect.


Ans 4:

Class : Class 4
C

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Subject :NSO    Class : Class 9

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 6
ANS IS 154

Ans 2:

Class : Class 5

Ans 3:

Class : Class 5

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Subject :NSO    Class : Class 9

Different substances are classified as :
I. Pure substance
II. Homogeneous mixture
III. Heterogeneous mixture
A few common substances are listed below.
(i) Air, (ii) Graphite, (iii) Gasoline, (iv) Diamond, (v) Tap water, (vi) Iron, (vii) Sodium chloride, (viii) Iodised salt, (ix) Brass, (x) Oil and water

Which of the following represents the correct classification of the given substances?
A I - (ii), (vi), (ix); II - (i), (v), (vii); III - (iii), (iv), (viii), (x)
B I - (ii), (iv), (vi), (vii); II - (i), (iii), (v), (viii), (ix); III - (x)
C I - (i), (iv), (vii), (ix); II - (ii), (v), (viii); III - (iii), (vi), (x)
D None of these represents the correct match.


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