Which of the following food chain shows spindle shaped pyramid of number?
Grass $\rightarrow$ Insects $\rightarrow$ Frog
Phytoplankton $\rightarrow$ Zooplankton $\rightarrow$ Small fish
Tree $\rightarrow$ Birds $\rightarrow$ Hawks
Tree $\rightarrow$ Birds $\rightarrow$ Insects $\rightarrow$ Bacteria
Distinguish between
$(a)$ Litter and detritus
$(b)$ Primary and secondary productivity
If a predator overexploits its prey in an ecosystem then what might be consequences of this?
Water plants provide ....... to water animals
The percentage of light energy utilized for photosynthesis by higher plants is
The primary consumers in a pond ecosystem are