Question

hey guys. ..plz try this

Answer 1

The Answer is.......


Option (2) B


This is because in a forest ecosystem, there is the highest number of grass and other crops present at lowest part, Then second-lowest is less as it contains herbivores.The third lowest part contains weak-predators and they are the third lowest. The top has the lowest no. as it contains lions, tigers, etc.


Hope this helps...♥♥♥♥

Answer 2

Radhe Radhe☺️

հҽɾҽ íՏ վօմɾ ɑղՏաҽɾ:-

option (b) is the correct answer bcz...

The pyramid of biomass is relatively more illustrative than the pyramid of numbers because it represents quantitative relationship of the standing crop biomass

sol:-

There are 3 types of ecological pyramids (eltonian pyramids), such as:-

1) pyramid of numbers

2) pyramid of biomass

3) pyramid of energy.

If we see the fig.(1) compare to pyramids of numbers then it will be correct answer....

let take a small example......

In a lake ecosystem ,the base of the pyramids is occupied by producers(diatoms, algae -whose number is maximum). The second trophic level is represents by zooplanktons(primary consumer).The third trophic level is medium sized fishes(smaller in number) The fourth trophic level is represented by large fishes which are very few in number.

but in some time the pyramid of numbers are not an ideal device to illustrate the food chain.

how???

let see another example.....

In parasaitic Food chains the pyramid of numbers is reversed .For instance ,a tree supports a large no.of fruit or seed -eating birds ,which in turn are infested by a large no.of ecto and endoparasites

Then come to biomass:-

The pyramid of biomass represents total weight of living matter present at each trophic level of the food chain.

we discuss about the parasaitic food chain.......

one tree when we measure how heavy it is, it's going to be absolutely huge in the graph.
now when we look at the insects thousands upon thousands insects .They certainly do not weight as the tree that can not be possible bcz they are living on the tree .The tree is supporting them both with food and at a home so the amount of insects living on the tree can not be heavier than the tree and then if we look at the biomass of the birds it's going to be relatively small bcz there's not thousands of them there is only ten or twenty of the birds living on the tree .

so, we can see that the pyramid of numbers can represent there is a balance or im-balance but in case of biomass there 's showing how much mass

sorry I can't explain the biomass well .....

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