Select the correct option w.r.t. Age pyramids.
$a$ - Expanding, $b$ - stable, $c$ - Declining
$a$ - stable, $b$ - Expanding, $c$ - Declining
$a$ - stable, $b$ - Declining, $c$ - Expanding
$a$ - Declining, $b$ - stable, $c$ - Expanding
The pyramid of number of a parasitic food chain in tree ecosystem is
Assertion : Pyramid of energy may be upright or inverted.
Reason: Only $20\%$ of energy goes to next trophic level.
In an ecosystem, there are more prey than predators. This relationship is called
Under what condition, the upright pyramid of biomass becomes inverted