Biology ยท 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

What is the relationship between trophic levels and biomass in a food web?

  1. Biomass increases from lower trophic levels to higher trophic levels.

  2. Biomass decreases from lower trophic levels to higher trophic levels.

  3. Biomass remains the same at all trophic levels.

  4. Biomass fluctuates randomly between trophic levels.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Biomass decreases from lower trophic levels to higher trophic levels because each trophic level loses some energy to heat. This means that there is less energy available at each higher trophic level, and therefore less biomass.

Multiple choice

What is the role of top predators in a food web?

  1. They control the populations of herbivores.

  2. They prevent the overgrazing of plants.

  3. They help to maintain biodiversity.

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Top predators play a vital role in food webs by controlling the populations of herbivores, preventing the overgrazing of plants, and helping to maintain biodiversity.

Multiple choice

What is the difference between a food chain and a food web?

  1. A food chain is a linear sequence of organisms, while a food web is a complex network of interconnected food chains.

  2. A food chain is a closed system, while a food web is an open system.

  3. A food chain is more stable than a food web.

  4. A food chain is less diverse than a food web.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A food chain is a linear sequence of organisms, where each organism eats the one below it. A food web is a complex network of interconnected food chains, where organisms can eat multiple different things and be eaten by multiple different things.

Multiple choice

Which of the following is an example of a functional group?

  1. All carnivores in an ecosystem

  2. All herbivores in an ecosystem

  3. All plants in an ecosystem

  4. All animals in an ecosystem
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A functional group is a group of species that share similar functional traits and perform similar roles in an ecosystem. All carnivores in an ecosystem form a functional group because they share the trait of being predators and they perform the role of consuming prey.

Multiple choice

Which of the following is an example of a functional group?

  1. All plants

  2. All animals

  3. All carnivores

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

A functional group is a group of organisms that share similar traits and perform similar functions in an ecosystem. All carnivores, for example, share the trait of eating meat and perform the function of consuming other animals.

Multiple choice

What is the term used to describe the process by which phytoplankton cells are grazed by zooplankton?

  1. Grazing

  2. Predation

  3. Herbivory

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

Grazing is the term used to describe the process by which phytoplankton cells are consumed by zooplankton. This process is an important part of the marine food web.

Multiple choice

What is the primary role of producers in an ecosystem?

  1. Decomposing organic matter

  2. Consuming other organisms

  3. Converting sunlight into energy

  4. Regulating the flow of water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Producers, such as plants, use sunlight through photosynthesis to convert carbon dioxide and water into energy-rich compounds.

Multiple choice

Which type of organism occupies the highest trophic level in an ecosystem?

  1. Producers

  2. Primary consumers

  3. Secondary consumers

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

Apex predators are at the top of the food chain and have no natural predators.

Multiple choice

Which organisms occupy the first trophic level in most food chains?

  1. Producers

  2. Consumers

  3. Decomposers

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

Producers, such as plants, algae, and some bacteria, are the primary energy producers in a food chain, converting sunlight or inorganic compounds into organic matter.

Multiple choice

What is the term used to describe organisms that consume other organisms?

  1. Producers

  2. Consumers

  3. Decomposers

  4. Top Predators
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Consumers are organisms that obtain energy and nutrients by consuming other organisms. They can be further classified into primary, secondary, tertiary, and quaternary consumers.

Multiple choice

Which type of consumer feeds directly on producers?

  1. Primary Consumers

  2. Secondary Consumers

  3. Tertiary Consumers

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

Primary consumers are organisms that feed directly on producers, such as herbivores that consume plants.

Multiple choice

What is the term used to describe organisms that break down dead organic matter?

  1. Producers

  2. Consumers

  3. Decomposers

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

Decomposers are organisms, such as bacteria and fungi, that break down dead organic matter into simpler substances, releasing nutrients back into the environment.

Multiple choice

Which trophic level typically contains the greatest biomass?

  1. Producers

  2. Primary Consumers

  3. Secondary Consumers

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

Producers, being the foundation of the food chain, typically have the greatest biomass, as they convert inorganic matter into organic matter.

Multiple choice

Which trophic level typically has the lowest population density?

  1. Producers

  2. Primary Consumers

  3. Secondary Consumers

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

Top predators, being at the highest trophic level, typically have the lowest population density due to limited resources and competition.

Multiple choice

Which trophic level typically has the highest energy content?

  1. Producers

  2. Primary Consumers

  3. Secondary Consumers

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

Producers, being the primary energy producers, typically have the highest energy content, as they capture and convert sunlight or inorganic compounds into organic matter.