Advertisements
Advertisements
प्रश्न
What is a 'food web'? Show its formation.
Advertisements
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
APPEARS IN
संबंधित प्रश्न
List two biotic components of a biosphere.
List two important roles play in the environment by decomposers.
Construct a food chain comprising the following :
Snakes, Hawk, Rats, Plants
Fill in the following blank with suitable word :
A series of organisms, each of which feeds on the next organism, the beginning of which is a green plant, is called a .............
Name one decomposer.
What is a trophic level?
Write down a food chain which ends with humans.
At which trophic level a person is feeding when he is eating eggs.
What is a food chain?
Organisms which synthesise carbohydrates from inorganic compounds by using radiant energy are called ______.
The following is a food chain that ends with human :
How does this food chain differ form a usual food chain involving human such as : plants → goat → human?
Most of the water surface of a lake is covered with algae. This algae is part of the food chain which also includes small fish, bird, larvae and big fish. Which of the following will obtain the maximum energy?
(a) big fish
(b) bird
(c) larvae
(d) small fish
Human body is made up of five important components, of which water is the main component. Food, as well as potable water, are essential for every human being. The food is obtained from plants through agriculture. Pesticides are being used extensively for a high yield in the fields. These pesticides are absorbed by the plants from the soil along with water and minerals and from the water bodies these pesticides are taken up by the aquatic animals and plants. As these chemicals are not biodegradables, they get accumulated progressively at each trophic level. The maximum concentration of these chemicals gets accumulated in our bodies and greatly affects the health of our mind and body.
- Why is the maximum concentration of pesticides found in human beings? (1)
- Give one method which could be applied to reduce our intake of pesticides through food to some extent. (1)
- Various steps in a food chain represent:
- Food web
- Trophic level
- Ecosystem
- Biomagnification (1)
- With regard to various food chains operating in an ecosystem, man is a:
- Consumer
- Producer
- Producer and consumer
- Producer and decomposer (1)
Arrange the following in a correct sequence and form a food chain
Human → Insect → Algae → Fish
The process of accumulation of harmful chemical substances like pesticides, in the body of living organisms at each trophic level of a food chain is known as ______.
The sequence of who eats whom in an ecosystem is called as ______.
In a food chain grasshopper gets energy by eating frog.
Analogy:
Primary Consumer: Goat, Cow:: Secondary Consumer: ______.
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
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
