Advertisements
Advertisements
Question
Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Can the organisms of any trophic level be removed without causing any damage to the ecosystem?
Solution
Yes. Depending on the trophic level, various organisms will be affected differently if all of them are eliminated. For instance, eliminating all of the producers (T1) will negatively impact both herbivores and carnivores as well as all other consumer types, whereas eliminating all of the herbivores will negatively impact only the carnivores while increasing the number of producers.
No. The removal of any organism at any trophic level will always have a negative impact on the ecosystem. For example, eliminating tigers and lions, two of the top carnivores will quickly increase the number of deer, which will then quickly consume the available vegetation, leading to a shortage of vegetation and a deer population crash.
APPEARS IN
RELATED QUESTIONS
"Energy flow in a food chain is unidirectional" Justify this statement.
List two important roles play in the environment by decomposers.
Name the organisms belonging to the second and the fourth trophic levels in the food chain comprising the following :
Frogs, Plants, Snakes, Hawk, Insects
Draw the food chain with four trophic levels.
Write down a food chain in the sea.
Write a common food chain of a pond ecosystem having four links.
If a grasshopper is eaten by a frog, then the energy transfer will be from ______.
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?
One of the following is not a consumer. This one is :
(a) giraffe
(b) antelope
(c) algae
(d) alligator
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?
Fill in the following blank with suitable word :
Pesticides enter the food chain at the ...........level
Fill in the following blank with suitable word :
Grass → ........... → Human
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.:
The harmful chemical which is accumulating in human beings through food chain is :
(a) benzenehexachloride
(b) dichlorodiphenyltrichloroethane
(c) chlorofluorocarbon
(d) abscisic acid
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.
(a) In which organisms the pesticides enter from the polluted water? What is this level of organisms known as?
Give one example of a food chain in an aquatic ecosystem?
The process of accumulation of harmful chemical substances like pesticides, in the body of living organisms at each trophic level of a food chain is known as ______.
In a food chain grasshopper gets energy by eating frog.
Define – Heterotrophs.
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.
