Tag: food chain and food web

Questions Related to food chain and food web

Food web is constituted by

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

  1. Various interlinked food chains in a community

  2. Relationship between animals and plants

  3. Relationship between organisms and their environment

  4. Relationship between animals, plants and microbes

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Correct Option: A
Explanation:
A food chain is series of plants/animals which are interrelated in the form of organism being eaten as food by the other. Food web is constituted by various interlinked and interdependent food chains in a community. It is also called as consumer-resource system. Ecosystem consists of living organisms and their abiotic environment. 
Thus, the correct answer is 'Various interlinked food chains in a community.'

A food chain can have trophic levels

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

  1. Three or four

  2. Three

  3. Two

  4. One

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Correct Option: A
Explanation:

Food chain in an ecosystem is defined as the passage of food from one trophic level to the next higher trophic level. The transfer of food from one trophic level to the next level results in the passage of energy through these trophic levels. A food chain can have 3 or 4 trophic levels. Plants are producers which are present in first trophic level. Primary consumers are second trophic levels which eat plants. They are herbivores. Secondary consumer are present make third trophic level. They eat primary consumers and are carnivores. Tertiary or top consumer make fourth trophic level. They are carnivores

Thus, the correct answer is 'Three or four.'

Food levels of an ecosystem are known as

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

  1. Producer levels

  2. Herbivore levels

  3. Consumer levels

  4. Trophic levels

Show answer
Correct Option: D
Explanation:

A food chain is series of plants/animals which are interrelated in the form of organism being eaten as food by the other. A food chain consists of producers abd consumers. In the given food chain, plants are producers. They are present in the first trophic level. It is also called as T$ _1$ trophic level. The animals eating plants are called as primary consumers. They are herbivores and occupy the second trophic level in an ecosystem. It is also called as T$ _2$ trophic level. Animals eating primary consumers are called as secondary consumers. They occupy the third trophic level in an ecosystem. It is also called as T$ _3$ trophic level. 

Thus, the correct answer is 'Trophic levels.'

In general, food webs consist of producers, consumers, and decomposers.

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

  1. True

  2. False

  3. Either

  4. Neither

Show answer
Correct Option: A
Explanation:
Food web is an interconnected network of many food chains. In a food web, an organism occupies more than one trophic level. It may feed on different organisms of lower trophic levels and may get eaten itself by organisms of higher trophic levels. Food chain in turn, is a series of organisms which eat one and get eaten by other. A food chain comprises of different organisms at subsequent trophic levels. Autotrophs being producers occupy the lowest trophic level while consumers and decomposers occupy higher trophic levels. So, a food web consists of producers, consumers and decomposers with each occupying a particular trophic level.
Hence, the statement given in the question is correct.
So, the correct answer is 'True'.

Food web ensures survival of all types of trophic levels.

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

  1. True

  2. False

  3. Either

  4. Neither

Show answer
Correct Option: A
Explanation:
Food web is a mesh like network of food chains which are interconnected. In a food web, an organism occupies more than one trophic level. It feeds on the organisms of lower trophic levels and is also eaten by other organisms of higher trophic levels. Thus all organisms at different trophic levels get food in a food web which ensures their survival. 
Hence, the statement given in the question is correct.
So, the correct answer is 'True'.

An example of a producer in the aquatic food web would be

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

  1. Duckweed

  2. Ducks

  3. Fish

  4. Insects

Show answer
Correct Option: A
Explanation:
Producers are the green plants which convert light energy into chemical energy and prepare their own food. They are autotrophic component of an ecosystem. They are green plants and are photosynthetic. Their kind varies with the type of ecosystem. In an aquatic ecosystem, producers will be aquatic plants. For example, Duckweed also known as water lenses. These are flowering aquatic plants which keep floating on the surface of water. Since these plants are photosynthesising, they are producers in an aquatic food web.
So, the correct answer is 'Duckweed'.

Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the

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

  1. food web

  2. ecological pyramid

  3. ecosystem

  4. food chain

Show answer
Correct Option: A
Explanation:
A. Food web is an interconnected network of many food chains. An organism occupies more than one trophic level in a food chain. It feeds on different organisms of lower trophic levels and may be eaten by other organisms of higher trophic levels.
B. An ecological pyramid is the diagrammatic representation of the relationship between numbers, biomass and energy content of producers and consumers in an ecosystem.
C. The ecosystem is the community of organisms which interact with each other and with their surroundings or environment.
D. A food chain is a series of organisms which eat one and get eaten by others.
So, the correct answer is 'Food web'.

Trophic levels are formed by-

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

  1. only plants

  2. only animals

  3. only carnivores

  4. organisms linked in food chain

Show answer
Correct Option: D
Explanation:
A trophic level is the position of an organism in a food chain. A food chain starts with producers which are green plants and occupy the lowest trophic level. The highest trophic level is occupied by carnivores which feed on lower trophic levels for energy. A simple food chain is represented as:
Plant ---> Herbivore ---> Carnivore
Hence, trophic levels are formed by different organisms linked in a food chain.
So, the correct answer is 'organisms linked in the food chain'.

Each step in a food chain is called a

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

  1. trophical level.

  2. consumer level.

  3. food web.

  4. producer.

Show answer
Correct Option: A
Explanation:
A. Trophic level is the position of an organism that it occupies in a food chain. Simply, trophic level is each step in a food chain representing producers and consumers.
B. Consumer levels represent heterotrophs that feed on producers and occupy higher trophic levels in a food chain.
C. Food web is an interconnected network of food chains.
D. Producers are the green plants that convert light energy into chemical energy and prepare their food. 
So, the correct answer is 'trophical level'.

Which pair is not correctly related?

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

  1. GPP - Photosynthetic organisms

  2. Middle strata of forest ecosystem - Shrubs

  3. Abundance of decomposers - Sea surface

  4. Flow of energy - Always unidirectional

Show answer
Correct Option: C
Explanation:

A. Gross primary productivity (GPP) is a term used to describe the rate at which plants and other photosynthetic organisms produce organic compounds in an ecosystem. Hence 'GPP - Photosynthetic organisms' are related to each other.

B. Stratification is the layering of habitats within an ecosystem with the presence of distinctive physical and biological boundaries between the strata (layers). In a temperate deciduous forest, you typically have 5 vertical layers: the canopy layer, the sapling layer, the shrub layer, the herbaceous layer, and the moss layer. Hence 'Middle strata of forest ecosystem - Shrubs' are related to each other.
C. The cycling of materials such as carbon, water, and other nutrients is mainly dependent upon soil-dwelling decomposer organisms such as bacteria fungi, earthworms, and insects. Bacteria and fungi are the most abundant of the microbial decomposers. Hence the sea surface is not a decomposer 'Abundance of decomposers - Sea surface' are not related to each other.
D. The flow of energy in food chains is unidirectional. The energy which passes to the herbivores does not come back to the autotrophs. The energy that is captured by the autotrophs does not revert back to the Sun. Hence 'Flow of energy - Always unidirectional' are related to each other.
So the answer is option C 'Abundance of decomposers - Sea surface'.