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A food chain outlines the movement of energy and nutrients through an ecosystem. The principles of ecological energetics were established by Lindeman in 1942.
- By taking into account the effectiveness of transfer between trophic levels, he tried to quantify the ideas of food chains and food webs.
- The variety of organisms that live in an ecosystem's different trophic levels is one of its defining characteristics.
- A food chain can be used to explain the connection between the constituents of one trophic level and those of adjacent trophic levels.
- At the base, energy is produced by plants, then it moves up to higher-level organisms like herbivores.
- Finally, when carnivores consume herbivores, energy is transferred from one level to the other.
Also read: Energy Flow in Ecosystem
| Table of Content |
Key Terms: Food chain, carnivores, decomposers, photosynthesis, detritus food chain, trophic level.
Food Chain
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Different organisms in our environment have different levels of energy consumption.
- Energy is transferred from one level to the next using a mechanism called the food chain.
- A food chain is a sequential sequence that demonstrates the transfer of energy from one organism to another.
- Energy moves along a particular pathway in a community that includes producers, consumers, and decomposers.
- However, it passes through various organisms as it moves from one stratum to the next.
A food chain, which depicts the route taken by food from a producer to a consumer at the end, demonstrates the flow of energy through a system. In general, food chains consist of 3 to 5 trophic connections and 15 to 20 species. The physical features of a specific ecosystem may also be reflected in the food chain's length. The food chain in a harsh arctic environment is much shorter than it is in a temperate or warm one.
Also read: Photosynthesis in Higher Plants
Components of Food Chain
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The various components of a food chain include -
- Primary producer
The base level of the food chain is composed of autotrophs. They are organisms that can produce their own food from substances like carbon dioxide and convert it into energy with the aid of sunlight. The sunshine provides fuel for the organisms at the bottom of the food chain.
- Primary consumer
The second trophic level is made up of heterotrophic animals. They consume the autotroph biomass at the top of the food chain. In order to fuel their own metabolic processes and promote their own development, herbivores use the fixed energy and nutrients found in the autotrophic biomass they consume as food.
- Secondary consumer
Animals that eat herbivores are the next link in the cycle and are referred to as secondary consumers.
- Tertiary consumer
The next category of consumers is tertiary consumers. Tertiary consumers are predators that eat other carnivores.
- Decomposers
Dead plants and creatures are decomposed by decomposers. They also degrade other species' waste. They maintain a steady supply of nutrients for the primary producers, making them a crucial component of the food chain.
Food Web
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All the food chains in a particular ecosystem make up a food web. Each organism in an ecosystem is linked to a number of food chains.
- Energy and nutrients can travel along different food chains as they migrate through the ecosystem.
- A food web is made up of all the linked and overlapping food networks in an ecosystem.
The interconnected pathways of a significant number of distinct species at each trophic level is referred to as "food webs." The feeding relationship between species in an ecosystem is thus represented by a food web, which is made up of linked food chains.
Also Read: Our Environment
Types of Food Chains
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The different types of food chains are as follows -
The sun provides all energy for grazing food chains.
- Primary producers are the first link in these food chains.
- Primary consumers or herbivores form the second component.
- The third component in the cycle, secondary consumers or primary carnivores, obtain energy by eating herbivores.
Animals classified as secondary or tertiary carnivores eat main carnivores to obtain their organic energy.
The Detritus food chain begins through the dead organic matter, an essential source of energy. Numerous types of microscopic fungi, bacteria, and other saprophytes contribute significantly to the breakdown of organic matter in order to acquire the energy necessary for their survival and growth.
- There is a connection between the detritus and grazing food networks.
- The majority of natural environments have both grazing-type and detritus-type food chains.
- However, the relative importance of these factors differs from ecosystem to ecosystem.
- As a significant part of the annual energy flow travels through this circuit, grazing food chains predominate in terrestrial and shallow water ecosystems.
- In tidal marshes, the detritus food chains are the pathway for almost 90% of the primary output.
Also Check:
| Chapter Related Topic | ||
|---|---|---|
| Difference Between Food Chain And Food Web | Decomposition | Food Web |
| Binomial Nomenclature | Taxonomic Hierarchy of Plants and Animals | Reproduction in Plants |
Trophic Level
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An organism's place in the food chain is described by its trophic level.
- The term "trophic" comes from a Greek word that means "to food" or "feeding."
- It is just a feeding stage, as frequently shown in a food chain.
- Every ecosystem has a different amount of trophic levels.
The division of organisms into trophic levels within a food chain is based on how each individual organism uses food to acquire energy. Trophic levels in a food chain are directly proportional to the number of segments it contains.
Ten Percent Law of Energy Transfer
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The amount of energy that can be transferred up the food chain is constrained, and as a result, there are only so many trophic levels that can exist.
- Only 10% of the energy is transferred from each lower trophic level to the following/higher trophic level.
- Raymond Lindeman came up with this rule, also known as the 10% energy rule.
- As some of the sun's energy is used by plants during photosynthesis, the main consumers do not receive all of the energy transferred from the producers/plants.
- The remaining energy is used for additional metabolic activities, some of which result in heat emission.
Importance of Food Chain
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The intricate connections in ecosystems is revealed by food chains.
- They may show the interdependence of every living thing.
- The biosphere's living elements are found in its food chain.
- These are the mechanisms that allow energy to move from one dimension to another.
- Transfer of materials and nutrients also occurs through the food chain.
Also Read:
Things to Remember
- A food chain is a chronological arrangement representing the flow of energy from one creature to another.
- A food web is made up of all the food networks in an ecosystem.
- Each organism in an environment is a component of various food chains.
- The detritus food chain begins with dead biological matter, a crucial source of energy.
- Organic matter is significantly increased by the decomposition of plant and animal components as well as animal waste.
- As it shows how food is obtained and how energy needs are passed from one organism to another, a food chain is important.
- A food chain demonstrates the interdependence of all living things on one another.
Sample Questions
Ques. What is the difference between a food chain and a food web? (3 marks)
Ans. Animals find food along a singular path that makes up a food chain. However, a food web represents various routes where plants and creatures are interconnected. Multiple food networks are included in a food web.
- In a food web, an organism consumes a variety of foods as opposed to a singular item in a food chain.
- There is only one route for energy to flow through a food chain, whereas there are numerous paths through a food web.
Ques. What is the role of decomposers in the food chain? (3 marks)
Ans. Decomposers consume dead objects, including wood and leaf litter, animal carcasses, and human waste. Decomposers play a critical role in the food chain by breaking down the remains of dead organisms and organic waste materials into simpler compounds that can be reused by other living organisms. Decomposers are mainly bacteria, fungi, and some species of insects and invertebrates that consume the dead organic matter and break it down into simpler forms such as water, carbon dioxide, and minerals.
Without decomposers, dead organisms and waste materials would accumulate and rot, releasing harmful gases into the atmosphere and depleting the soil of essential nutrients. Decomposers help to recycle nutrients and organic matter back into the ecosystem, making them available for use by plants and other organisms.
In this way, decomposers serve as a vital link in the food chain, ensuring that the energy and nutrients from dead organisms and waste materials are returned to the ecosystem and made available for use by other living organisms.
Ques. Which organism assists in reintroducing nutrients to the food chain when plants and animals die? (3 marks)
Ans. The organism that assists in reintroducing nutrients to the food chain when plants and animals die is called a decomposer. Decomposers are organisms that break down dead organic matter and waste materials into simpler compounds, such as water, carbon dioxide, and minerals, which can be reused by other living organisms. Bacteria, fungi, and some species of insects and invertebrates are examples of decomposers that play a vital role in recycling nutrients and organic matter back into the ecosystem. By breaking down dead plants and animals, decomposers make nutrients available for use by other living organisms, completing the nutrient cycle and ensuring the continuation of life in the ecosystem.
Ques. What is photosynthesis? (2 marks)
Ans. Plants produce oxygen and sugar-based energy through a process known as photosynthesis, which uses sunlight, water, and carbon dioxide. Phototrophs transform light energy into chemical energy through a process called photosynthesis, which is then used to power cellular processes.
Ques. Why does the sun appear at the top of the food chain? (2 marks)
Ans. The original source of energy that enables things to produce is the sun. Energy cannot be transferred to another source if the initial source is absent. The sunshine provides fuel for the organisms at the bottom of the food chain.
Ques. Energy levels in the food chain rise from lower trophic levels to higher trophic levels. Explain. (2 marks)
Ans. The flow of nutrients and energy through an environment is described by a food chain.
- Energy is first produced by vegetation at the most fundamental level before moving up to higher-level organisms like herbivores.
- Energy is then transferred from one carnivore to the next when they consume the herbivores.
- A food web is made up of all the linked and overlapping food networks in an ecosystem.
- In food networks, organisms are categorised into trophic levels.
Ques. Define the concept of trophic level. (2 marks)
Ans. Trophic levels are the different points along a food chain or ecological pyramid where food (or energy) is transferred from one organism to another.
Organisms have a particular position in the food chain depending on where they get their nutrition or food from.
Ques. What will happen if the producer in the food chain dies? (2 marks)
Ans. The autotrophs, or producers, provide the consumers with sustenance and energy. There would eventually be no living on Earth if there were no producers because the consumers would starve to death and the other dependent trophic levels would also perish.
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