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Subject :NSO    Class : Class 8

Refer to the given figures of bacteria X, Y and Z and read the statements (i), (ii), (iii) and (iv) regarding them.

(i) Bacterium X can be causal organism of typhoid.
(ii) Bacterium Y can cause a disease which disrupts proper exchange of gases.
(iii) Bacterium Z can convert lactose sugar of milk into lactic acid.
(iv) Bacterium X can be the causal organism of cholera.
Which of these statements are incorrect?

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


Ans 1:

Class : Class 8
a

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 9

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Subject :NSO    Class : Class 7

Read the following statements and select the correct option.

Statement 1: Coniferous trees have needle-shaped leaves.
Statement 2: This helps them to cope with shortage of water when the ground is frozen in water.

ABoth statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
BBoth statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
CStatement 1 is true but statement 2 is false.
DBoth statements 1 and 2 are false.


I thought that the needle-shaped leaves are present so that the snow which fell on the leaves can slide off

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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
cholera , anthrax , tuberculosis , typhoid

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Subject :NSO    Class : Class 2

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Subject :NSO    Class : Class 7

The lizard is well-adapted to live in human dwellings. Which function of its adaptations is incorrectly described?


  Adaptation Function
A Long, sticky tongue To catch fastmoving prey
B Long, narrow and flat body To crawl between narrow crevices and spaces easily
C Sticky pads on the underside of the feet To walk on walls and ceilings without falling
D Tail that can drop off and wriggles for a while. To attract mates for reproduction


Lizards, if get captured by the tail, shed (drop off) the tail and are able to flee. The detached tail continues to wriggle for some time creating a deceptive sense of continued struggle and distracting the predator’s attention from the fleeing prey animal. The lizard can partially regenerate its tail over a period of weeks. Thus, it is a self-defense mechanism to elude a predator’s grasp and not to attract mates for reproduction.

Ans 1:

Class : Class 3
Lizards, if get captured by the tail, shed (drop off) the tail and are able to flee. The detached tail continues to wriggle for some time creating a deceptive sense of continued struggle and distracting the predator’s attention from the fleeing prey animal. The lizard can partially regenerate its tail over a period of weeks. Thus, it is a self-defense mechanism to elude a predator’s grasp and not to attract mates for reproduction.

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Subject :NSO    Class : Class 4

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