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11.Organisms and Populations
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The main aim of ‘Earth Summit’ organised at Brazil was
A
To think over ozone layer depletion in stratosphere
B
To increase oxygen in atmosphere
C
To encourage agriculture
D
To use solar energy
Solution
(a)In 'Earth summit' held in $1992 $ in Rio-de-Janeiro (Brazil), the whole world has adopted a proposal to stop use of $CFC $ by the end of $ 2000. $ $CFC$ is strong enemy of ozone and cause depletion of ozone layer.
Standard 12
Biology
Similar Questions
Match the columns :
| Column – $I$ | Column – $II$ |
| $(a)$ Camouflage | $(i)$ Dendrobatespumilio |
| $(b)$ Batesian mimicry | $(ii)$ Horse- shoe bat |
| $(c)$ Warning mimicry | $(iii)$ Monarch butterfly |
| $(d)$. Echo -location | $(iv)$ Praying Mantis |
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