Distinguish between 

$(a)$ Upright and inverted pyramid

$(b)$ Food chain and Food web

 

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$(a)$ Upright and inverted pyramid 

Upright pyramid Inverted pyramid
$1$. The pyramid of energy is always upright. $1$. The pyramid of biomass and the pyramid of numbers can be inverted.
$2$. In the upright pyramid, the number and biomass of organisms in the producer level of an ecosystem is the highest, which keeps on decreasing at each trophic level in a food chain. $2$. In an inverted pyramid, the number and biomass of organisms in the producer level of an ecosystem is the lowest, which keeps on increasing at each tropic level 

$(b)$ Food chain and Food web 

Food chain Food web 
$1$. It is a single linear sequence of organisms. $1$. It contains a number of interconnected food chains.
$2$. Members present at higher trophic levels feed on single types of organisms. $2$. One organism has alternate food sources.

 

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$I.$ Charles Elton developed the concept of ecological pyramid

$II.$ After the name these pyramids are also called as Eltonian pyramids

$III.$ It is a graphical representation or pyramid shaped diagram which depicts the number of organisms, biomass and energy at each trophic level

Which of the statements given above are correct?