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प्रश्न
The harmful chemical which is accumulating in human beings through food chain is :
(a) benzenehexachloride
(b) dichlorodiphenyltrichloroethane
(c) chlorofluorocarbon
(d) abscisic acid
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उत्तर
dichlorodiphenyltrichloroethane
The harmful pesticide that accumulates in the bodies of human beings through the food chain, through a process known as biomagnification, is dichlorodiphenyltrichloroethane (DDT).
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संबंधित प्रश्न
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
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?
Tree ; Frog ; Snake ; Grass ; Lizard
A food chain represents a unidirectional flow of X. What is X?
What will happen if we kill all the organisms in one trophic level?
Write down a food chain in the sea.
A student went to study a local pond. In one part of the pond she noticed tadpoles scraping at some pond weed. In another part she saw a water beetle holding a tadpole in its jaws.
(a) Construct a food chain for the pond.
(b) How many links are there in this chain?
Give one example of a simple food chain.
Organisms of a higher trophic level which feed on several types of organisms belonging to a number of lower trophic levels constitute the ______.
One of the following is not a consumer. This one is :
(a) giraffe
(b) antelope
(c) algae
(d) alligator
If a harmful chemical enters a food chain comprising cat, mice and plants, which one of these organisms is likely to have the maximum concentration of the harmful chemical in its body?
What is ten per cent law? Explain with an example.
What does garbage consist of?
| 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: (1)
- Food web
- Trophic level
- Ecosystem
- Biomagnification
- With regard to various food chains operating in an ecosystem, man is a: (1)
- Consumer
- Producer
- Producer and consumer
- Producer and decomposer
Primary consumers that eat plants are called _______.
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. |
Observe the food web and answer the questions given below:
Why do all food chains start with plants?
______ obtained energy from the chemical breakdown of dead organisms.
What is Autotrophs?
