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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
"Energy flow in a food chain is unidirectional" Justify this statement.
In the following food chain, plants provide 500 J of energy to rats. How much energy will be available to hawks from snakes?
Plants → Rats → Snakes → Hawks
A food chain represents a unidirectional flow of X. What is X?
Draw the food chain with four trophic levels.
At which trophic level a person is feeding when he is eating roasted chicken.
Construct a long food chain.
Write a common food chain of a pond ecosystem having four links.
Which of the following statement is incorrect?
The following is a food chain that ends with human :
plants → bee → human
Explain how plants provide food for bees.
Some hunters are roaming in the plush green forest of Africa. They spot a deer and kill it. They decide to roast the deer there and then and eat it. When the hunters had just finished enjoying the feast of roasted deer, a lion attacks them. The lion kills one of the hunters and eats his flesh.
(a) write a food chain which provides food to lion in this case.
(b) Which animal (other than deer) the lion could look for food if he did not get the hunter as prey?
(c) Which other animal in the forest could have been in place of lion?
(d) How does the above food chain differ form the food chain such as : plants → goat → man?
Why are there rarely more than five links (or five organisms) in a food chain?
Fill in the following blank with suitable word :
Plants → Antelope → ............
With the help of a food chain, explain how biological magnification of harmful chemicals can occur.
Consider the following food chain
(i) Plants → Mice → Snakes → Hawks
(ii) Plants → Mice →Hawks
If energy available at the producer level in both the food chains is 100 J, in which case will hawks get more energy as food and by how much? Justify your answer.:
What percentage of sun's energy falling on the leaves of green plants is utilised by the plants in the process of photosynthesis and stored as chemical energy of food?
(a) 99 per cent
(b) 10 per cent
(c) 1 per cent
(d) 20 per cent
A forest ecosystem having a lot of green plants has some foxes, lions and rabbits in it.
(a) Write a food chain comprising all the four organisms mentioned above.
(b) Name (i) one herbivore, and (ii) two carnivores, in this food chain.
(c) Name the link which is a predator as well as a prey.
(d) Name (i) second trophic level, and (ii) third trophic level.
(e) Which link of this food chain can feed on second trophic level as well as third trophic level, independently?
(f) If the sun provides 1000 J of energy to the plants, then how much energy will be transferred to fox through the food chain.
Arrange the following in a correct sequence and form a food chain
Rabbit → Carrot → Eagle → Snake
Green plants utilize ______ percent of sun’s energy to prepare their food by the process of photosynthesis.
Natural agents like ______ are the decomposition factors breaking complex forms into simpler units.
Which group of organisms are not constituents of a food chain?
- Grass, lion, rabbit, wolf
- Plankton, man, fish, grasshopper
- Wolf, grass, snake, tiger
- Frog, snake, eagle, grass, grasshopper
