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 process by which animals convert food into energy?

  1. Photosynthesis

  2. Cellular respiration

  3. Fermentation

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

Cellular respiration is the process by which animals convert food into energy.

Multiple choice

What is the process by which plants make food?

  1. Photosynthesis

  2. Respiration

  3. Transpiration

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

Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to make food in the form of glucose.

Multiple choice

What is the term for the process by which animals obtain energy from food?

  1. Cellular respiration

  2. Photosynthesis

  3. Transpiration

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

Cellular respiration is the process by which animals obtain energy from food by breaking down glucose in the presence of oxygen.

Multiple choice

Which of the following is not an example of a functional group?

  1. Predators

  2. Herbivores

  3. Decomposers

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

Producers are not a functional group, as they do not share a common function or role within an ecosystem.

Multiple choice

What is the term used to describe the transfer of energy and nutrients through different trophic levels in an ecosystem?

  1. Food chain

  2. Food web

  3. Ecological pyramid

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

A food chain is a linear sequence of organisms through which nutrients and energy pass, starting with a producer organism and ending with a top predator.

Multiple choice

What is the role of Indian Mollusks in the marine food chain?

  1. They are primary consumers.

  2. They are secondary consumers.

  3. They are tertiary consumers.

  4. They occupy various trophic levels.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Indian Mollusks occupy various trophic levels, ranging from primary consumers to tertiary consumers, depending on their species and diet.

Multiple choice

Which of the following organisms is a primary producer?

  1. Grass

  2. Deer

  3. Lion

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

Primary producers are organisms that can make their own food from inorganic molecules. Grass is a primary producer because it can use sunlight, water, and carbon dioxide to make glucose.

Multiple choice

Which of the following organisms is a primary consumer?

  1. Grass

  2. Deer

  3. Lion

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

Primary consumers are organisms that eat primary producers. Deer are primary consumers because they eat grass.

Multiple choice

Which of the following organisms is a secondary consumer?

  1. Grass

  2. Deer

  3. Lion

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

Secondary consumers are organisms that eat primary consumers. Lions are secondary consumers because they eat deer.

Multiple choice

Which of the following organisms is a tertiary consumer?

  1. Grass

  2. Deer

  3. Lion

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

Tertiary consumers are organisms that eat secondary consumers. There are no tertiary consumers in the food web described in this question.

Multiple choice

What is the trophic level of a decomposer?

  1. First

  2. Second

  3. Third

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

Decomposers are not assigned a trophic level because they do not consume other organisms. They obtain their energy from breaking down dead organic matter.

Multiple choice

What is the role of producers in a food web?

  1. They produce food for other organisms.

  2. They consume other organisms.

  3. They decompose organic matter.

  4. They fix nitrogen from the atmosphere.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Producers are organisms that can make their own food from inorganic molecules. They are the foundation of all food webs.

Multiple choice

What is the role of consumers in a food web?

  1. They produce food for other organisms.

  2. They consume other organisms.

  3. They decompose organic matter.

  4. They fix nitrogen from the atmosphere.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Consumers are organisms that cannot make their own food and must consume other organisms to obtain energy.

Multiple choice

What is the role of decomposers in a food web?

  1. They produce food for other organisms.

  2. They consume other organisms.

  3. They decompose organic matter.

  4. They fix nitrogen from the atmosphere.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Decomposers are organisms that break down dead organic matter into simpler molecules. This process releases nutrients back into the environment, which can then be used by producers.

Multiple choice

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

  1. Energy flows from higher trophic levels to lower trophic levels.

  2. Energy flows from lower trophic levels to higher trophic levels.

  3. Energy flows in both directions between trophic levels.

  4. Energy does not flow between trophic levels.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Energy flows 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.