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प्रश्न
Name the organisms belonging to the second and the fourth trophic levels in the food chain comprising the following :
Frogs, Plants, Snakes, Hawk, Insects
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उत्तर
The second trophic level consists of insects, and the fourth trophic level consists of snakes.
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संबंधित प्रश्न
List two important roles play in the environment by decomposers.
Why are plants called producers?
Which of the following belong to the same trophic level?
Goat ; Spider ; Plants ; Hawk ; Rat
Consider the food chain :
Grass → Deer → Lion
What will happen if all the lions are removed from the above food chain?
At which trophic level a person is feeding when he is eating apple.
Which of the following represents a possible food chain found in a pond :
| Primary producers |
Primary consumers | Secondary consumers |
| (a) green algae | fish | mosquito larvae |
| (b) fish | green algae | mosquito larvae |
| (c) mosquito larvae | fish | green algae |
| (d) green algae | mosquito larvae | fish |
The decomposers in an ecosystem ______.
A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y
Name two zooplanktons.
A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y
What could be X?
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?
What would happen to the number of rabbits and grass plants if the number of foxes increased?
In a food chain consisting of grass, frog, bird and insects, where will the concentration of the harmful chemicals be maximum?
What does garbage consist of?
Which of the following limits the number of trophic levels in a food chain?
(a) insufficient food supply from producer level
(b) decrease in energy at higher trophic levels
(c) increase in the number of organisms at higher trophic levels
(d) accumulation of harmful chemicals at higher trophic levels
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)
Give some examples for Biodegradable and Non-biodegradable waste.
| S. No. | Biodegradable waste | Non-biodegradable waste |
| 1. | Food Waste | Plastic Bottles |
| 2. | ||
| 3. | ||
| 4. | ||
| 5. |
Green plants utilize ______ percent of sun’s energy to prepare their food by the process of photosynthesis.
______ are organisms that are able to produce their own organic food.
The sequence of who eats whom in an ecosystem is called as ______.
Assertion (A): The energy which passes to the herbivores does not come back to autotrophs.
Reason (R): The flow of energy in a food chain is unidirectional.
