MCQ
The relation between producers and consumers in an ecosystem can be graphically represented in the form of a pyramid called
- ✓Ecological pyramid
- BTrophic level
- CPi chart
- DPyramid of biomass
$(i)$ Pyramid of number
$(ii)$ Pyramid of biomass
$(iii)$ Pyramid of energy
The concept of pyramid was proposed by Charles Elton $(1927)$ so, they are also called as Eltonian pyramids
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$(i)$ Most of them are fresh water organisms found in standing water.
$(ii)$ They have a protein rich layer (called pellicle) which makes their body flexible.
$(iii)$ They have two flagella, a short and a long one.
$(iv)$ Though they are photosynthetic in the presence of sunlight, but in the absence of sunlight they behave like heterotrophs by predating on other smaller organisms. Identify the correct group on the basis of these characters.