(D) Phosphates are essential nutrients that circulate through the ecosystem. They remain outside the natural cycle for a long period when they form in

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(D) Phosphates are essential nutrients that circulate through the ecosystem. They remain outside the natural cycle for a long period when they form insoluble compounds with metals (like calcium or iron) in the soil,or when they are sequestered in the skeletal structures (bones and teeth) of organisms,as these components do not decompose rapidly.

Class 12 Biology Ecosystem Mix Examples- Ecosystem

Medium

The phosphates remain outside the natural cycle for a long time:

A
When they form compounds with metals
B
When they are incorporated in bone and teeth
C
When the bodies of the organisms excrete and decompose
D
Both $(A)$ and $(B)$

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Ecosystem

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Mix Examples- Ecosystem

Identify the group of herbivores from the following that are included as primary consumers in an ecosystem.

Medium

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Match the List-$I$ with List-$II$:

List-$I$ List-$II$

$a$. Carbon dissolved in oceans $i$. $55$ billion tons

$b$. Annual fixation of carbon through photosynthesis $ii$. $71 \%$

$c$. $PAR$ captured by plants $iii$. $4 \times 10^{13} \ kg$

$d$. Productivity of oceans $iv$. $2$ to $10 \%$

Choose the correct answer from the options given below:

List-$I$	List-$II$
$a$. Carbon dissolved in oceans	$i$. $55$ billion tons
$b$. Annual fixation of carbon through photosynthesis	$ii$. $71 \%$
$c$. $PAR$ captured by plants	$iii$. $4 \times 10^{13} \ kg$
$d$. Productivity of oceans	$iv$. $2$ to $10 \%$