Biology · Environmental Studies

Ecosystem Nutrition and Energy Flow

1,093 Questions

Ecosystem nutrition and energy flow questions cover trophic levels, food chains, and biodegradable materials. These concepts frequently appear in general science sections of major competitive exams. Review these questions to build a solid understanding of ecological interactions.

Trophic levels conceptFood chain orderAutotrophic nutritionEnergy assimilationScavengers and decomposers

Ecosystem Nutrition and Energy Flow Questions

Multiple choice geography pollution - types and sources study of water pollution threats to water resource major hazards in india and prevention pollution and environment

Bio-magnification ___________.

  1. means increasing the concentration of various toxic substance along food chain.

  2. means increasing the concentration of various substance along food chain.

  3. means increasing the concentration of various useful substance along food chain.

  4. means decreasing the concentration of various toxic substance along food chain.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Biomagnification is specifically defined as the increase in concentration of toxic substances as they pass through successive trophic levels in a food chain.

Multiple choice evs mud and stones soil - formation and profile soil-nature soil profile

............... helps in maintaining the supply of nutrients to the growing plants.

  1. Herbivores

  2. Carnivores

  3. Decomposers

  4. Omnivores
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

All living organisms have a definite life cycle.

When an organism dies, his dead body is decayed by numerous saprophytes feeding over it. These saprophytes convert complex organic material into simple inorganic material which is then stored in the soil in the form of nutrients. When seeds of a plant grow, they receive nutrition from the soil which is absorbed by the roots of the plants. 
In this way, decomposers that decay plant and animal bodies provide the nutrition back to the soil
So, option C, 'Decomposers' is the correct option.

Multiple choice biology interdependence in living beings - plants and animals animals as consumers scavengers and decomposers interdependence between plants and animals

Earthworm is a 

  1. Herbivore

  2. Secondary consumer

  3. Tertiary consumer

  4. Detrivore
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Decomposer is an organism which decomposes dead organic matter. They breakdown organic matter of dead animals and plants and release nutrients in the environment. Detritivores are also called as detritus eaters. They are heterotrophs that obtain nutrients by consuming detritus (decomposing plant and animal matter). Earthworm is an example of detrivore.

Thus, the correct answer is 'Detrivore.'

Multiple choice biology interdependence in living beings - plants and animals animals as consumers scavengers and decomposers interdependence between plants and animals

The last chain of food is

  1. producers

  2. decomposers

  3. parasites

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
A. Producers are photosynthetic green plants. They are autotrophs as they convert solar radiations into chemical energy and prepare their own food.
B. Decomposers are micro consumers that reduce organic remains. They form the last step of the food chain because they breakdown detritus (the dead remains of plants and animals) into smaller particles.
C. Parasites are the organisms that live in or on the host organism from which they derive their nutrition.
So, the correct answer is 'Decomposers'.
Multiple choice biology interdependence in living beings - plants and animals animals as consumers scavengers and decomposers interdependence between plants and animals

Which of the following is nature's cleaner?

  1. Consumers

  2. Producers

  3. Decomposers and scavengers

  4. Symbionts
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
A food chain is series of plants/animals which are interrelated in the form of organism being eaten as food by the other. It consists of producers, consumers and decomposers. Plants are producers. The herbivores are primary consumers and carnivores are secondary consumers. Decomposers and scavengers are those which decomposes the waster organic matter and release energy back in the environment. Hence, they are also called as nature's cleaner. They are present in the apex of the pyramid.
Thus, the correct answer is 'Decomposers and scavengers.'
Multiple choice biology interdependence in living beings - plants and animals animals as consumers scavengers and decomposers interdependence between plants and animals

Bacteria and fungi are

  1. Scavengers

  2. Primary consumers

  3. Secondary consumers

  4. Decomposers
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Decomposers are microorganisms which decomposes organic matter. These include bacteria and fungi. They breakdown organic compounds obtained from the dead animals and leaves and releases carbon and energy back in the environment. They usually occupy the apex of the pyramid.

Thus, the correct answer is 'Decomposers.'

Multiple choice biology interdependence in living beings - plants and animals animals as consumers scavengers and decomposers interdependence between plants and animals

A detritivore is a/an

  1. Animal feeding on plant matter

  2. Animal feeding on decaying organic matter

  3. Plant feeding on an animal

  4. Animal feeding on another animal
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A detritivore is an animal feeding on decaying organic matter. It is a heterotroph that obtains nutrients by consuming detritus. Examples include millipedes, earthworms, fiddler crabs, sea cucumbers. 

Thus, the correct answer is 'Animal feeding on decaying organic matter.'

Multiple choice biology interdependence in living beings - plants and animals animals as consumers scavengers and decomposers interdependence between plants and animals

The organisms, which attack dead animals are

  1. First link of the food chain are known as primary producers

  2. Second link of the food chain are known as herbivores

  3. Third link of the food chain are known as tertiary consumers

  4. Present at the end of food chain are detritivores
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The organisms which attack dead animals and obtain nutrition from their detritus (decomposing parts of plant and animals, even feces) are called as detritivores (kind of heterotrophs). They are present at the end of the food chain because they consume the highest trophic level organisms by their biomacromolecular digesting enzymes. Therefore, concluding the food chains often.

So, the correct answer to the question is 'Present at the end of the food chain are detrivores'.

Multiple choice biology interdependence in living beings - plants and animals animals as consumers scavengers and decomposers interdependence between plants and animals

Efficient recycling of nutrients from dead bodies into living things is done by?

  1. Producers

  2. Consumers

  3. Decomposers

  4. Predators
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Decomposer are feed on the decaying organic matter and convert this matter into nitrogen and carbon dioxide. 
  • Decomposers are the fungi and bacteria, which are the saprophytes.
  • The saprophytes play a vital role in recycling the nutrients so that the producers i.e. plants can use them once again.
Multiple choice biology interdependence in living beings - plants and animals animals as consumers scavengers and decomposers interdependence between plants and animals

The breakdown of dead and decaying organisms is carried out by

  1. Decomposers

  2. Humans

  3. Insects

  4. Rodents
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Decomposers are organisms that break down dead or decaying organisms, and in doing so they carry out the natural process of decomposition. Like herbivores and predators, decomposers are heterotrophic, meaning that they use organic substrates to get their energy, carbon and nutrients for growth and development.