Advertisements
Advertisements
Question
Will the levels of biological magnification be different at different levels of the ecosystem?
Solution 1
Solution 2
The level of these harmful substances will go on increasing from one trophic level to the next. When certain harmful substances enter the food chain at the level of primary producers, they get concentrated many times at each subsequent trophic level.
APPEARS IN
RELATED QUESTIONS
Give reason to justify the following: Flow of energy in a food chain is unidirectional.
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
In the following food chain, plants provide 500 J of energy to rats. How much energy will be available to hawks from snakes?
Plants → Rats → Snakes → Hawks
Explain how the pesticides enter a food chain and subsequently get into our body.
Name one decomposer.
The decomposers in an ecosystem ______.
Organisms which synthesise carbohydrates from inorganic compounds by using radiant energy are called ______.
A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y
Name one phytoplankton.
Give one example of a food chain having four organisms. Below each organism write the three appropriate terms from the part (a) above which you think it represents.
The following statement is true or false :
Only 10 per cent of the light energy given by the sun is available for transfer at each higher trophic level in a food chain.
Name two predators of snakes in a food web operating in a forest ecosystem.
With the help of a food chain, explain how biological magnification of harmful chemicals can occur.
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.
We should reduce the use of the plastic bags, bottles etc. because ______.
Food chains are very important for the survival of most species.
Matter and energy are two fundamental inputs of an ecosystem. Movement of:
In a food chain, the third trophic level is always occupied by
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
Study the picture given below showing three food chains (a), (b) and (c) and answer the following questions:
- Name the type of ecosystems that exist in food chains (b) and (c).
- The first trophic level in all food chains is producers. Why? What percentage of solar energy do these producers capture for their use?
- Why are the arrows shown in the diagram in one direction only and not vice versa? Justify.
