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प्रश्न
Explain how the pesticides enter a food chain and subsequently get into our body.
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उत्तर १
A large number of pesticides and chemicals are used to protect our crops from pests and diseases. Some of these chemicals are washed down from the soil, while some enter the water bodies. From the soil, they are absorbed by plants along with water and minerals; and from the water bodies, they are taken up by aquatic plants and animals. This is how these chemicals enter the food chain. As these chemicals cannot decompose, they accumulate progressively at each trophic level. This increase in the concentration of harmful chemicals with each step of the food chain is called biomagnification. As human beings occupy the top level in any food chain, these chemicals get accumulated in our bodies.
उत्तर २
Pesticides are non-biodegradable wastes which pass along the food chain from crops to man or other animals and birds and harm them.
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संबंधित प्रश्न
The first trophic level in a food chain is always a green plant. Why ?
What is meant by a primary consumer, secondary consumer and a tertiary consumer? Give one example of each.
Write one or two word for the following statement/definition :
Organisms which depend on the producers for food either directly or indirectly
In the food chain comprising of a snake, grass, insect, and frog, the secondary consumer is :
(a) insect
(b) snake
(c) frog
(d) grass
A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y
Which organism in the above food chain is a (1) primary consumer, and (2) tertiary consumer?
Write the percentage of energy transferred from autotrophs to the next level in a food chain.
Calculate the amount of energy that will be available to big fish in the following food chain, if 10,000 J of energy is available to small algae from the sun :
Small algae → Zooplankton → Fish → Big fish
How much energy will be available to hawks in the food chain comprising hawk, snake, paddy and mice, if 10,000 J of energy is available to paddy from the sun?
A food chain consists of fish, larvae, phytoplanktons and birds. The level of pesticides in water in which the fish, larvae and phytoplanktons live is quite high.
Which organism will have the maximum amount of pesticides accumulated through the food chain? What is this process known as?
Green plants utilize ______ percent of sun’s energy to prepare their food by the process of photosynthesis.
