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प्रश्न
What is a trophic level?
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उत्तर
Trophic levels are the feeding positions of organisms within a food chain, with producers at the base, followed by herbivores and successive levels of carnivores. Each level represents a stage in the transfer of energy and food. An organism can occupy multiple trophic levels depending on what it eats.
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संबंधित प्रश्न
Which of the following are always at the second tropic level of food chains?
List two main components of ecosystem?
"Our food grains such as wheat and rice, the vegetables and fruits and even meat are found to contain varying amounts of pesticide residues." State the reason to explain how and why it happens?
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
What will happen if we kill all the organisms in one trophic level?
Name the organisms belonging to the second and the fourth trophic levels in the food chain comprising the following :
Frogs, Plants, Snakes, Hawk, Insects
Can the organisms of any trophic level be removed without causing any damage to the ecosystem? Will the impact of removing all the organisms in a trophic level be different for different trophic levels?
In a food chain, the third trophic level is always occupied by :
(a) carnivores
(b) herbivores
(c) decomposers
(d) producers
Which of the following 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
The sea water contains water beetles, tadpole, fish and weeds.
Which organisms are (i) predators, and (ii) prey?
The following is a food chain that ends with human :
plants → bee → human
How do bees provide food for humans?
What would happen to the number of rabbits and grass plants if the number of foxes decreased?
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.
Name the process in which a harmful chemical enters the food chain and gets concentrated at each trophic level.
What is ten per cent law? Explain with an example.
Explain how harmful chemicals enter our bodies.
What is meant by bioconcentration of pesticides
What does garbage consist of?
Explain why, a food chain usually cannot have more than three or four steps.
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
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
"Energy flow in food chains is always unidirectional". Justify this statement. Explain how the pesticides enter a food chain and subsequently get into our body.
Arrange the following in a correct sequence and form a food chain
Human → Insect → Algae → Fish
Green plants utilize ______ percent of sun’s energy to prepare their food by the process of photosynthesis.
In an ecosystem, herbivores represent ______.
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
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.
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.
