Food Chain MCQ Quiz in मल्याळम - Objective Question with Answer for Food Chain - സൗജന്യ PDF ഡൗൺലോഡ് ചെയ്യുക

The correct answer is 'Food Web'

Key Points

• Food Web:
  • A food web is a complex network of interconnected food chains within an ecosystem.
  • It illustrates how different organisms are interconnected through various feeding relationships.
  • In a food web, energy and nutrients are transferred from one organism to another, demonstrating the flow of energy within an ecosystem.
  • Food webs provide a more comprehensive and realistic depiction of an ecosystem's feeding relationships compared to a single food chain.

Additional Information

• Trophic Level:
  • Trophic levels refer to the different stages in a food chain or food web, such as producers, primary consumers, secondary consumers, etc.
  • Each trophic level represents a step in the flow of energy through an ecosystem.
  • While trophic levels are part of food chains and food webs, they do not encompass all the interconnected food chains within an ecosystem.
• Multiple Food Chains:
  • Multiple food chains refer to several individual food chains existing within an ecosystem.
  • However, this term does not account for the interconnectedness and complexity presented by a food web.
• Ecological Pyramid:
  • An ecological pyramid is a graphical representation showing the distribution of biomass, numbers, or energy among the trophic levels of an ecosystem.
  • Ecological pyramids are useful for visualizing the relative amounts of energy or matter at each trophic level but do not depict the interconnected food chains like a food web does.

Explanation:

• Ecosystem: All organisms such as plants, animals, microorganisms and human beings as well as the physical surroundings interact with each other and maintain a balance in nature. All the interacting organisms in an area together with the non-living constituents of the environment form an ecosystem.

Feeding relation in natural surrounding:

• Food chain: A food chain shows the feeding relationship between different organisms in a particular environment and/or habitat. A food chain shows how energy is passed from the sun to producers, from producers to consumers, and from consumers to decomposes such as fungi. They also show how animals depend on other organisms for food.
• The systematic diagram to show this chain-

• In this chain, Grass ⟶ Grasshopper ⟶ Frog ⟶ Snake ⟶ Hawk.

According to the question, If all Deer will be killed.

Grass → Deer (×)→ Tiger

Then, Grass is increased as no deers are there to eat and the population of tigers will decrease because they did not get enough food.

So, Grass increases, and the population of tigers decreases.

• Potential energy is the stored ability to perform work.
• To actually perform work, potential energy must be transformed into other forms of energy. 
• Sun is the major source of energy for the ecosystem.
• The chemical energy of food is the main source of energy required by all living organisms.
• This energy is transmitted to different trophic levels along the food chain.

Energy flow in the ecosystem:

• In a food chain, the energy flow follows the 10 per cent law.
• According to this law, only 10 per cent of energy is transferred from one trophic level to the other; the rest is lost into the atmosphere.
• This is clearly explained in the following figure and is represented as an energy pyramid.
• This energy is stored in various organic products in the plants from the sun via the process of photosynthesis.
• This is then passed on to the primary consumers in the food chain when the herbivores consume (primary consumers) the plants as food.
• Then conversion of chemical energy stored in plant products into kinetic energy occurs, degradation of energy will occur through its conversion into heat.
• The energy flow is: Primary (100%) → First level/ Primary (10%) → Second-level/ Secondary (1%) → Third level / Tertiary (0.1%).
• The energy flow in the ecosystem is clearly unidirectional.

Important Points

• Grass → Beetle → Frog → Snake → Hawk
• 1st Tropic level → 2nd Trophic level → 3rd Trophic level → 4th Trophic level → 5th Trophic level
• 7000 KJ → 700 KJ → 70 KJ → 7 KJ → 0.7 KJ

Thus, at the producer level, the potential energy is 7000 KJ.

The correct answer is A-D-C-B.

Key Points

• The food chain is a sequence of transfers of matter and energy in the form of food from organism to organism.
• A food chain shows how organisms are related to each other by the food they eat.
• Food chains intervene locally into a food web because most organisms consume more than one type of animal or plant.
• An example of a food chain is insects- frogs-snakes-hawks.
• In the above example, insects are the food of frogs, frogs are eaten by snakes and snakes are further the food of hawks.

 Thus, we can say that the correct order for food chain is A (insects)- D (frogs)- C (snakes)- B (hawks).

The correct answer is 'Producers'.

Key Points

• Energy flow in a food chain:
  • Energy flow in an ecosystem occurs through a food chain, starting from producers to various levels of consumers.
  • Producers, like plants and algae, convert solar energy into chemical energy through photosynthesis.
  • Consumers at higher trophic levels obtain their energy by eating other organisms.
• Energy levels at different trophic levels:
  • Producers have the highest energy level because they receive energy directly from the sun.
  • As energy is transferred from one trophic level to the next, a significant amount of energy is lost, primarily as heat.
  • Consumers of the first trophic level (herbivores) receive less energy compared to producers.
  • Consumers at the top trophic level (carnivores and apex predators) have the least amount of energy available.

Additional Information

• Consumers of first trophic level:
  • Herbivores that eat producers and obtain energy from them.
  • They have less energy compared to producers due to energy loss in the transfer process.
• Consumers of top trophic level:
  • Carnivores or apex predators that are at the top of the food chain.
  • They receive the least energy because of multiple energy transfer steps and losses.
• Energy loss in food chains:
  • Approximately 90% of energy is lost as heat, respiration, and excretion at each trophic level.
  • This results in only about 10% of energy being passed on to the next trophic level.

The correct answer is Detritivores.

Key Points

• Detritivorous animals include millipedes, springtails, woodlice, dung flies, slugs, many terrestrial worms, sea stars, sea cucumbers, and fiddler crabs.
• Decomposers (detritivores) break down dead plant and animal material and wastes and release them again as energy and nutrients into the ecosystem for recycling.
• Decomposers, such as bacteria and fungi (mushrooms), feed on waste and dead matter, converting it into inorganic chemicals that can be recycled as mineral nutrients for plants to use again.

Important Points

• Trophic levels can be represented by numbers, starting at level 1 with plants.
• Further trophic levels are numbered subsequently according to how far the organism is along the food chain.
  • Level 1: Plants and algae make their own food and are called producers.
  • Level 2: Herbivores eat plants and are called primary consumers.
  • Level 3: Carnivores that eat herbivores are called secondary consumers.
  • Level 4: Carnivores that eat other carnivores are called tertiary consumers.
  • Level 6: Decomposers.

• The correct answer is Producers. Key Points 

  • The first trophic level of the said food chain is Autotrophs or the producers.
  • A food chain shows the feeding relationship between different organisms in a particular environment and/or habitat.
  • A food chain shows how energy is passed from the sun to producers, from producers to consumers, and from consumers to decomposes such as fungi.

  Additional Information 

  • Based on the source of their nutrition or food, organisms occupy a specific place in the food chain that is known as their trophic level.
  • Producers belong to the first trophic level, herbivores (primary consumers) to the second, and carnivores (secondary consumer) to the third. The important point to note is that the amount of energy decreases at successive trophic levels.

  

•  

​Food chain: 

• A food chain shows the feeding relationship between different organisms in a particular environment and/or habitat.
• A food chain shows how energy is passed from the sun to producers, from producers to consumers, and from consumers to decomposes such as fungi.
• They also show how animals depend on other organisms for food.

Key Points

Tropic level:   

• Based on the source of their nutrition or food, organisms occupy a specific place in the food chain that is known as their trophic level.
• Producers belong to the first trophic level, herbivores (primary consumer) to the second and carnivores (secondary consumer) to the third. 
• The important point to note is that the amount of energy decreases at successive trophic levels.
• Every food chain starts with producers at the base tropic level and tertiary consumers at the top of the tropic level.

Thus, in a food chain, a fox is a secondary consumer.

The correct answer is Frog.

Key Points

• Food chain: 
  • A food chain shows the feeding relationship between different organisms in a particular environment and/or habitat. A food chain shows how energy is passed from the sun to producers, from producers to consumers, and from consumers to decomposes such as fungi. They also show how animals depend on other organisms for food.
  • In a food chain of Grass > Insect > Frog > Snake, the frog occupies the third trophic level as it eats insects and further becomes the food for the snake.
• Tropic level: 
  • Based on the source of their nutrition or food, organisms occupy a specific place in the food chain that is known as their trophic level.
  • Producers belong to the first trophic level, herbivores (primary consumer) to the second, and carnivores (secondary consumer) to the third. The important point to note is that the amount of energy decreases at successive trophic levels.
  • Primary producers are at the first tropic level - They produce food on their own with the help of photosynthesis. Ex- plants, trees.
  • Primary Consumers are the herbivores' animals, whose nutrition is directly based on plant products. Ex- Cow, deer, grasshoppers, small insects, etc.
  • Secondary consumers are the carnivorous animals Like- small birds, wolfs, etc.
  • Tertiary Consumers are on the top-level carnivore like men, lions, etc.
  • Only 10% of energy is transferred to higher levels from the previous one. So, the demand for food is more in higher levels.

​Food chain: 

• A food chain shows the feeding relationship between different organisms in a particular environment and/or habitat.
• A food chain shows how energy is passed from the sun to producers, from producers to consumers, and from consumers to decomposes such as fungi.
• They also show how animals depend on other organisms for food.

Key Points 

Tropic level:  

• Based on the source of their nutrition or food, organisms occupy a specific place in the food chain that is known as their trophic level.
• Producers belong to the first trophic level, herbivores (primary consumer) to the second and carnivores (secondary consumer) to the third. 
• The important point to note is that the amount of energy decreases at successive trophic levels.
• Every food chain starts with producers at the base tropic level and tertiary consumers at the top of the tropic level.

Important Points 

Thus, carnivores are in the third trophic level of the food chain.