Q12 of 42 Page 1

Justify the statement, ‘‘Pyramid of energy is always upright, and can never be inverted.’’

•It is a graphical representation of amount of accumulated energy per unit area in different trophic levels of a food chain


•There is gradual decrease in energy level and this happens due to the 10% law of energy transfer (where only 10% of total energy is transferred from one level to another )


•The energy is highest at the producer level



More from this chapter

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10

What is ‘Ori’? State its importance during cloning of a vector.

OR


Explain the importance of ‘selectable marker’, with the help of a suitableexample.


 11

What is ‘carrying capacity’ of a species in a habitat? Why is logistic growth model considered more realistic?

 13

Explain any three remedial measures to overcome the acute air pollution in our cities.

OR


Write any three ways by which noise pollution affects the human bodyadversely. List any three steps that should be followed in order to reduce noise pollution.


 14

(a) What is the primary productivity of an ecosystem and how is itexpressed ?

(b) Explain what does the equation given below show:


NPP = GPP – R


OR


(a) Name the type of detritus that decomposes faster. List any twofactors that enhance the rate of decomposition.


(b) Write the different steps taken in humification and mineralization during the process of decomposition.