Question

Fill in the missing data in the following table. (2)

33.Convex mirrors are used as rear – view mirrors in automobiles. Explain why? (2)

34.Differentiate between autotrophs and heterotrophs(any two differences). (2)

35.Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like

human? (2)

36.How is ozone gas formed in the atmosphere? Ozone is a deadly poison, then why is it

essential to protect ozone gas in the atmosphere? (2)

SECTION – C

37.a) What is biological magnification? At which trophic level in a food chain this magnification is

maximum? Give reason to your answer. (3)

Or

Q.NO ACID BASE SALT

I CH3COOH NaOH -------------------

ii ------------- Ca(OH)2 Ca(NO3)2

iii H2SO4 ------------------- K2SO4

iv -------------- Mg(OH)2 MgCl2​

Answer 1

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