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प्रश्न
What is a 'food web'? Show its formation.
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उत्तर
The inter-connected food chains operating in an ecosystem that establish a network of relationships among various species comprise a food web.
A food web is formed by many food chains operating together. A food web operating in a grassland is shown in the figure.
Five food chains are possible in this food web, which are as follows.
1) Grass→ Grasshopper→ Frog→ Hawk
2) Grass→Grasshopper→ Rat→ Fox
3) Grass→ Rabbit→ Fox
4) Grass→ Rat → Snake→Hawk
5) Grass→Rat →Hawk
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संबंधित प्रश्न
In a food chain of frog, grass, insect and snake, assign trophic level to frog.
In the following food chain, 20,000 J of energy was available to the plants. How much energy would be available to man in this chain?
Plants → Sheep → Man
The following statement is true or false :
In biology, human beings are called producers.
Which of the following belong to the same trophic level?
Goat ; Spider ; Plants ; Hawk ; Rat
Construct a food chain comprising the following :
Snakes, Hawk, Rats, Plants
A food chain represents a unidirectional flow of X. What is X?
What is the role of decomposers in the ecosystem?
Write down a food chain which ends with humans.
At which trophic level a person is feeding when he is eating apple.
Construct a long food chain.
A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y
Name one phytoplankton.
What would happen to the number of grass plants and foxes if the number of rabbits increased?
Give one example of a food chain having four organisms. Below each organism write the three appropriate terms from the part (a) above which you think it represents.
What does garbage consist of?
"Energy flow in food chains is always unidirectional". Justify this statement. Explain how the pesticides enter a food chain and subsequently get into our body.
In an ecosystem, herbivores represent ______.
A food chain comprising birds, green plants, fish and man. The concentration of harmful chemical entering the food chain will be maximum in ______.
The food chain begins with the energy given by the ______.
In the given food chain, suppose the amount of energy at the fourth trophic level is 5 kJ, what will be the energy available at the producer level?
Grass → Grasshopper → Frog → Snake → Hawk
In the following food chain, only 2J of energy was available to the peacocks. How much energy would have been present in Grass? Justify your answer.
GRASS → GRASS HOPPER → FROG → SNAKE → PEACOCK
