Question
Describe : Various food chains.
✓
Answer
→ Various organisms feed on one another. This series of organisms taking part at various biotic levels form a food chain.
→ Three different food chains are mentioned in the following diagram.
(Note : It is not necessary to draw diagram)
(1) Food chain in forest :
→ Plants $\rightarrow$ herbivores $\rightarrow$ Carnivores $\rightarrow$ Top Carnivores
(2) Food chain in grassland :
→ $
\text { Grass } \rightarrow \text { Insects } \rightarrow \text { Frogs } \rightarrow \text { reptiles } \rightarrow \text { Birds }
$
(3) Food chain in a pond :
→ Aquatic plants $\rightarrow$ Scorpion $\rightarrow$ Fishes $\rightarrow$ Birds like herons
(Note : In food chain, scorpions are generally found on land (Ground-feeding animals). Example of crabs are more suitable than scorpions.)
→ Each step of the food chain constitutes a nutrient level (trophic level). The autotrophs or the producers are at the first trophic level. They fix up the solar energy and make it available for heterotrophs or the consumers. The herbivores or the primary consumers come at the second trophic level small carnivores or the secondary consumers at the third and larger carnivores or the tertiary consumers form the fourth trophic level.
→ Three different food chains are mentioned in the following diagram.
(Note : It is not necessary to draw diagram)
(1) Food chain in forest :
→ Plants $\rightarrow$ herbivores $\rightarrow$ Carnivores $\rightarrow$ Top Carnivores
(2) Food chain in grassland :
→ $
\text { Grass } \rightarrow \text { Insects } \rightarrow \text { Frogs } \rightarrow \text { reptiles } \rightarrow \text { Birds }
$
(3) Food chain in a pond :
→ Aquatic plants $\rightarrow$ Scorpion $\rightarrow$ Fishes $\rightarrow$ Birds like herons
(Note : In food chain, scorpions are generally found on land (Ground-feeding animals). Example of crabs are more suitable than scorpions.)
→ Each step of the food chain constitutes a nutrient level (trophic level). The autotrophs or the producers are at the first trophic level. They fix up the solar energy and make it available for heterotrophs or the consumers. The herbivores or the primary consumers come at the second trophic level small carnivores or the secondary consumers at the third and larger carnivores or the tertiary consumers form the fourth trophic level.
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