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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 7

Refer to the given food web and select the incorrect option regarding it.


A V, W, X and U serve as top consumers in the given food web.
B The energy transferred from Q to U may be equal to or higher than the energy transferred from T to U.
C There are 12 food chains in the given food web, out of which 4 food chains have four trophic levels and rest have 3 trophic levels.
D Q, R, S and T are herbivores in the given food web.


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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 7

Refer to the given flow chart and select the incorrect option regarding it.


A If P is tap root, then it could be turnip whereas if P is adventitious root, then it could be Dahlia.
B If Q is water hyacinth, then it propagates by offsets whereas if Q is Colocasia, then it propagates by rhizome.
C R could be Bryophyllum or Kalanchoe that propagates through adventitious buds that develop in the marginal notches of leaves.
D P could be sweet potato, Q could be mint and R could be Begonia.


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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 7

The given photomicrograph shows the transverse section of two blood vessels, X and Y connecting the heart and the lungs.

Identify the blood vessels and select the incorrect statement regarding them.

A Blood vessel X connects right ventricle of heart with lungs.
B Blood vessel Y connects lungs with left atrium of heart.
C Blood in X contains higher percentage of oxygen as compared to blood in Y.
D X is pulmonary artery that carries deoxygenated blood from heart to lungs whereas Y is pulmonary vein that carries oxygenated blood from lungs to heart.


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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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