Q8 of 42 Page 1

Write the scientific name of the source from where cocaine is obtained. How does its use affect the human body?

Cocaine is obtained from Erythroxylum coca. It has a stimulating effect on the central nervous system and produces a sense of short lived euphoria. It interferes with the transport of dopamine and even causes hallucinations.


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a) Study the flow chart given below and complete the equation that follows by identifying 1, 2, 3 and 4.


(b) Mention the different ways by which the population density of different species can be measured.


OR


(a) ‘The pyramid of energy is always upright.’ Explain.


(b) Explain with the help of labelled diagrams, the difference between an upright pyramid of biomass and an inverted pyramid of biomass.


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Write the specific point in the palindrome and the bond that is cut by EcoRI.

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How is an alien species invasion considered as one of the causes of biodiversity loss? Support your answer with the help of an example.

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Effluent from the primary treatment of the sewage is passed through large aeration tanks for biological treatment. Explain the complete process that follows till the water is ready to be released into the natural water bodies.