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(D) $1$. Carbon constitutes $49\%$ of the dry weight of organisms,not $39\%$. Thus,option $A$ is incorrect.$2$. Fossil fuels represent a major reservo

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Rapid deforestation and massive burning of fossil fuels for energy and transport have significantly increased the rate of release of carbon dioxide into the atmosphere.

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(D) $1$. Carbon constitutes $49\%$ of the dry weight of organisms,not $39\%$. Thus,option $A$ is incorrect.$2$. Fossil fuels represent a major reservoir of carbon. Thus,option $B$ is incorrect.$3$. According to estimates,approximately $4 	imes 10^{13} 	ext{ kg}$ of carbon is fixed in the biosphere through photosynthesis annually,not $5 	imes 10^{13} 	ext{ kg}$. Thus,option $C$ is incorrect.$4$. Human activities such as rapid deforestation and the massive burning of fossil fuels for energy and transport have significantly increased the rate of release of carbon dioxide into the atmosphere,leading to global warming. Thus,option $D$ is correct.

Column-$I$	Column-$II$
$(i)$ Primary succession	$(i)$ Development of ecosystem
$(ii)$ Ecological succession	$(ii)$ Lichens
$(iii)$ Pioneer species on rocks	$(iii)$ Near to the equilibrium with the environment
$(iv)$ Climax community	$(iv)$ New species on bare environment

Choose the correct sentence regarding the carbon cycle.

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Match the columns:

Column-$I$ Column-$II$

$(i)$ Primary succession $(i)$ Development of ecosystem

$(ii)$ Ecological succession $(ii)$ Lichens

$(iii)$ Pioneer species on rocks $(iii)$ Near to the equilibrium with the environment

$(iv)$ Climax community $(iv)$ New species on bare environment

If less light falls on the pond's surface,what is the most likely consequence for the fish population?

Identify the possible link $A$ in the following food chain.
Plant $\rightarrow$ Insect $\rightarrow$ Frog $\rightarrow$ $A$ $\rightarrow$ Eagle

$A$: Niche becomes general and broader during biotic succession.
$R$: Species diversity increases but organic matter is decreased.

Succession on a secondary bare area is known as:

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