Tag: food chain and food web

Questions Related to food chain and food web

Trophic levels in ecosystem is formed by

evs insectivorous plants meaning of an ecosystem food chain and food web components of environment and their interdependencies

  1. Ony bacteria

  2. Only plants

  3. Only herbivores

  4. Organisms linked in food chain

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Correct Option: D
Explanation:

The food chain is the series or linear link of different organisms through which the nutrients flow from one level to another. The trophic levels are denoted by the flow of energy from one level to the next level. The levels in any ecosystem is known by the organisms which are connected with each other by the transfer of energy.

So, the correct answer is option D. 

Which of the following trophic levels includes a bird feeding on both insects and berries?

evs insectivorous plants meaning of an ecosystem food chain and food web components of environment and their interdependencies

  1. Primary consumer

  2. Secondary consumer

  3. Tertiary consumer

  4. Both A and B

  5. Both A and C

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Correct Option: D
Explanation:

Primary consumers are the organisms that feed on producers. Since the bird is feeding on berries (producer), it is a primary consumer. The organisms that feed on primary consumers are termed as secondary consumers. Since the bird is feeding on insects (primary consumer), it is a secondary consumer as well. This makes option D correct answer. 

All of the following organisms are correctly paired with their trophic level except

evs insectivorous plants meaning of an ecosystem food chain and food web components of environment and their interdependencies

  1. Tree- producer

  2. Hawk- primary consumer

  3. Fungi- detritivore

  4. Fox- secondary consumer

  5. Grasshopper- primary consumer

Show answer
Correct Option: B
Explanation:
The tree is a producer. Producers are any kind of green plant. Green plants make their food by taking sunlight and using the energy to make sugar.
Hawk is a tertiary consumer which eats secondary consumers like hawks eat owls in a food chain. 
Fungi is a detritivore. They are heterotrophs that obtain nutrients by consuming detritus.
Fox is a secondary consumer. They eat primary consumers. They are carnivores (meat-eaters) and omnivores (animals that eat both animals and plants).
Grasshopper is a primary consumer. They are animals that eat primary producers.
Therefore, the correct answer is option B.

Which of the following best describes the trophic level within an ecosystem?

evs insectivorous plants meaning of an ecosystem food chain and food web components of environment and their interdependencies

  1. Size of food eaten at that level

  2. Nutrient source of the organisms in each level

  3. Stages in ecological succession

  4. Habitats of the organisms within that level

  5. Elevation above sea level

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Correct Option: A
Explanation:

An ecosystem is made up of organisms that differ in the energy source that they depend on upon and how they provide energy for other organisms in the food web. The steps of the nutritive food chain in the ecosystem is known as trophic levels. In other words, it is the position that an organism occupies in a food chain depending on what it eats, and what eats it.

The base of the food web in marine ecosystem is

evs - i insectivorous plants meaning of an ecosystem food chain and food web components of environment and their interdependencies

  1. Phytoplankton

  2. Zooplankton

  3. Kelp

  4. Fish

  5. Whales

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Correct Option: A
Explanation:

Phytoplanktons are the major producers and constitute the base of five level food web of the marine ecosystem. They convert chemical energy into the usable form of energy. Zooplanktons and other herbivores feed on phytoplanktons and these herbivores are themselves eaten by higher level consumers. Fishes and whales occupy higher level as consumers. Kelps occupy the base of the food web in kelp beds only. The correct answer is option A.

Which of the following limits the number of trophic levels maintained by an ecosystem?

evs insectivorous plants meaning of an ecosystem food chain and food web components of environment and their interdependencies

  1. The number of species

  2. The population size

  3. The loss of potential energy

  4. The number of individuals

  5. The hours of sunshine

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Correct Option: C
Explanation:

With each trophic level, only 10% potential energy is transferred and 90% is lost as heat in respiration. The longer the food chain, the lesser is the energy transfer efficiency. To increase the energy transfer efficiency, food chains must be smaller with a limited number of trophic levels. Thus, the correct answer is C.

All organisms that feed at each other link in a food chain comprise a ______.

geography insectivorous plants meaning of an ecosystem food chain and food web components of environment and their interdependencies

  1. food pyramid

  2. energy pyramid

  3. trophic level

  4. calorie

  5. biomass

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Correct Option: C

Which of the following is false?

evs insectivorous plants meaning of an ecosystem food chain and food web components of environment and their interdependencies

  1. Quantity of biomass in trophic level at a particular period is called as standing crop.

  2. The energy content in trophic level is determined by considering a few individuals of a species in that trophic level.

  3. The succession that occurs in newly cooled lava is called as primary succession.

  4. Rate of succession is faster in secondary succession.

  5. Phytoplanktons are the pioneers in the aquatic ecosystem.

Show answer
Correct Option: B
Explanation:

Trophic level refers to each levels in the  ecological pyramid and is designated as per their position in the food chain. The trophic level starts from 1 -which represents the primary producers and it moves upto  primary consumers- level 2, secondary consumers -level 3 and tertiary consumers at level 4 or 5. In an aquatic ecosystem, the phytoplanktons are the pioneers and primary producers along with the algae and cyanobacteria. Standing crop refers to the mass of living material present at a trophic level at a particular time. The ecological succession takes place from primary to secondary and reaches a climax stage. primary succession refers to the ecological succession that takes place where no living organisms ever existed. for eg. the sucession that occurs in a newy cooled lava.  Moreover, it has been seen that the rate of succession is faster in secondary than the primary succession as soil is already present in case of secondary succession.

In a food chain, deer is eaten by lion and deer east vegetation. Which one of the statements given is true?
(P) Lion is second order consumer and deer is first order consumer.
(Q) Lion is predator and deer is prey.
(R) Lion is first order consumer and deer is second order consumer.
(S) Lion is third order consumer and deer is second order consumer.

evs insectivorous plants meaning of an ecosystem food chain and food web components of environment and their interdependencies

  1. Only (P) and (Q)

  2. Only (Q) and (R)

  3. Only (P) and (S)

  4. Only (P) and (R)

Show answer
Correct Option: A
Explanation:

In a food chain where a deer feeds on producers and lion feeds on the deer then, the deer is a first order consumer and the lion is a second order consumer, and as the lion feeds in the deer, lion is the predator and the deer is the prey. 

Thus, the correct answer is option A. 

If a grassland food chain is linked to the food chain in the forest. It can be termed as

evs - i insectivorous plants meaning of an ecosystem food chain and food web components of environment and their interdependencies

  1. Ecosystem

  2. Food chain

  3. Food web

  4. None of the above

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Correct Option: C