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प्रश्न
Which common pesticide has accumulated in human body in considerable amounts?
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उत्तर
The common pesticide that has accumulated in the human body in considerable amounts is DDT.
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संबंधित प्रश्न
"Energy flow in a food chain is unidirectional" Justify this statement.
Which category of organisms forms the starting point of a food chain?
Explain the terms 'producer' and 'consumer'. Give two examples of producers and two of consumers.
Write a common food chain of a pond ecosystem having four links.
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 |
In the figure given alongside, the various trophic levels are shown in the form of a pyramid. At which trophic level the maximum energy is available?
In the food chain comprising of a snake, grass, insect, and frog, the secondary consumer is :
(a) insect
(b) snake
(c) frog
(d) grass
The following is a food chain that ends with human :
plants → bee → human
Explain how plants provide food for bees.
The following is a food chain that ends with human :
plants → bee → human
How do bees provide food for humans?
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?
What is ten per cent law? Explain with an example.
Explain why, the flow of energy in the ecosystem is said to be unidirectional.
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.:
Name and state the law given by Lindeman which tells us how much energy entering a particular trophic level of organisms is available for trasnsfer to the next higher trophic level.
In the food chain given below, if the amount of energy available at fourth trophic level is 5 kJ, what was the energy available at the producer level?
Grass → Grasshopper → Frog → Snake → Hawk
(a) 500 kJ
(b) 50 kJ
(c) 5000 kJ
(d) 5 kJ
An aquatic food chain comprises of the organisms like tadpoles, weeds, fish and water beetles. The organism which gets the minimum energy through this food chain is :
(a) water beetles
(b) tadpoles
(c) weeds
(d) fish
Write the importance of the food chain.
Which of the following is an autotroph?
The food chain begins with the energy given by the ______.
