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Subject :NSO    Class : Class 7

The given graph shows net uptake and net release of oxygen by a plant kept in open over a 24 hour period.
Which of the following holds true regarding the given graph?


A At 0800 hour, the oxygen taken up by plant in respiration is equal to oxygen released by it during photosynthesis.
B Plant is respiring throughout the 24 hour period but it is photosynthesising only between 0600 hours to 1800 hours.
C Assuming that the plant has the same respiration rate throughout 24 hour period, 70 mg of oxygen is produced by plant at 1600 hour.
D The highest rate of photosynthesis occurs at 1200 hour.


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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 7

Which of the following statements are incorrect?
I. Decomposition reactions are generally carried out by heating or by passing electricity.
II. An oxidising agent removes hydrogen from other substance.
III. In precipitation reactions, two substances react in solid state to form a soluble product.
IV. Precipitation and neutralisation reactions are examples of single displacement reaction.

A I and III only
B III and IV only
C II and IV only
D All of these.


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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

Ans 1:

Class : Class 7
C is correct answer

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
its D

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 4

Read the following sentences with blanks in them. Select the option which correctly fills up the blanks in any two sentences.
(1) _________ provide door to door service.
(2) _________ carries country's largest amount of bulky goods like coal, cement, food grains, fertilizers, petroleum, automobiles, etc. from mines to industries and from industries to the areas of consumption.
(3) _________ is a better mode of transportation in reference to cross-continental transfers.
(4) _________ is very useful at the time of natural or any other calamities for saving people or supplying goods.
(5) Indian _________ service has the largest network in the world.

A 3 - Railways, 5 - Postal
B 3 - Water transport, 4 - Air transport
C 2 - Inland waterways, 5 - Telephonic
D 2 - Air transport, 1 - Roads


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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
Option a is correct

Ans 2:

Class : Class 4
Option a is correct

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