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[A] : The pyramid of biomass indicates t...

[A] : The pyramid of biomass indicates the decrease or the gradual reduction in biomass at each trophic level from base to apex .
[R] : In case of parasites , the pyramid of biomass is inverted .

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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[A] : There is a gradual increase in the energy content at successive trophic level from producer to consumers . [R] : Pyramid of energy does not show energy accumulation pattern at different trophic levels .

[A] : Energy pyramid is sloping . [R] : The energy of one trophic level is lower than another level as we go up .

To find the image - distance for varying object - distance in the case of a convex lens, a student obtains on screen a sharp image of a bright object placed very far from the lens. After that the gradually moves the object towards the lens and each time focuses its image on the screen. (a) In which direction - towards or away from the lens, does he move the screen to focus the object ? (b) What happens to the size of the image - Does it increase or decrease ? (c ) What happens when he moves the object very close to the lens ? (d) What happens to the intensity of the image as the object moves farther and farther away from the convex lens ?

TRUEMAN BIOLOGY-Ecology -ASSERTION AND REASON
  1. [A] : When the organisms live together in such a manner that one organ...

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  2. [A] : Aerenchyma is a specialized tissue in some water plants characte...

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  3. [A] : The pyramid of biomass indicates the decrease or the gradual red...

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  4. [A] : Climate is affected by vegetation . [R] : The indirect factors...

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  5. [A] : Man is the consumer of the ecosystem . [R] : An antiforest con...

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  6. [A] : The importance of ecosystem lies in flow of energy and cycling o...

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  7. [A] : Biomonitoring is reliable for determining the pollutants in air ...

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  8. [A] : The food webs are very important in maintaining the stability of...

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  9. [A] : If phytoplanktons are destroyed in the sea then it will effect t...

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  10. [A] : Epiphytes are not found in Delhi . [R] : Delhi has semi-arid c...

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  11. [A] : Water logged soils are physiologically dry . [R] : When the s...

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  12. [A] : There is a chemical warfare amongst some plants . [R] : The ro...

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  13. [A] : Total biomass on land is much more than that in water . [R] :...

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  14. [A] : Epiphytes differs from Lianas in that they are not rooted in th...

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  15. [A] : Biological indicators enhance usefulness of ecology to mankind ...

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  16. [A] : Depletion of ozone layer results in human disease like cancer ....

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  17. [A] : UV irradiation to disinfect polluted waters is not generally re...

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  18. [A] : A species is an interbreeding population which is reproductively...

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  19. [A] : Plants having capacity to withstand wide range of temperature t...

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  20. [A] : Each food-level in an ecosystem is called trophic level . [R]...

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