Biology · Environmental Studies

Ecosystem Nutrition and Energy Flow

1,235 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

If all the carbon dioxide were withdrawn from the biosphere, which organism would first experience the negative effects?

  1. Primary consumers

  2. Secondary consumers

  3. Producers

  4. Decomposers

  5. Tertiary consumers
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Producers are the green plants which prepare their food by photosynthesis by carbon dioxide, water, sunlight and chlorophyll. Hence, if all the carbon dioxide were to be withdrawn from the atmosphere they will be unable to do photosynthesis.

 

Multiple choice

What will happen, if all the green plants disappear from the earth?

  1. The carnivores will continue to live.

  2. Only the birds and insects will die.

  3. All the animals will die.

  4. Chemosynthetic bacteria will produce food for all.

  5. Decomposers will start acting in a massive way.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is true because all the animals directly or indirectly depend upon green plants for thier food intake.

Multiple choice

In most food webs green plants are very important because ______________.

  1. most animals eat plants

  2. they contain chlorophyll

  3. they can perform photosynthesis

  4. they provide protection to animals

  5. they consume and remove carbon dioxide
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Plants are very important as they perform photosynthesis by the help of chlorophyll, sunlight and carbon dioxide. M ost animals directly or indirectly depend upon plants for their survival.

Multiple choice

Which of the following options shows Biotic components?

  1. Producers, consumers, decomposers

  2. Consumers only

  3. Producers only

  4. Producers and consumers

  5. Decomposers only
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Producers are the green plants,  which prepare food by photosynthesis. Consumers consume the food prepared by the plants and decomposers are the microorganisms, which decompose everything.

Multiple choice

Which of the following is a logical sequence in carbon cycle?

  1. Producer - Consumer - Decomposer

  2. Decomposer - Consumer - Producer

  3. Producer - Decomposer - Consumer

  4. Consumer - Producer - Decomposer
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carbon cycle is the biogeochemical cycle by which carbon is exchanged among the bio - sphere pedophere, geosphere, hydrosphere and atmosphere of the earth.

Multiple choice

Extinction of a species, in a food chain, is compensated by

  1. food chain

  2. ecological pyramid

  3. food web

  4. None of the above

  5. -
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When many food chains are interlocked then it results in the formation of food web.Extinction of a species leads to a gap in food chain owing to its presence, which is then compensated by food web, which itself is formed by many food chains intermingled together.

Multiple choice

Energy enters in a food chain through

  1. producers

  2. primary consumers

  3. secondary consumers

  4. tertiary consumers

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Producers are the green plants which produce energy through the process of photosynthesis. Solar energy is converted into chemical energy during photosynthesis.

Multiple choice

Fungus in a forest ecosystem is a/an

  1. producer

  2. decomposer

  3. top consumer

  4. autotroph

  5. -
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

Multiple choice

Cuscuta is a

  1. parasitic plant

  2. symbiotic plant

  3. predator

  4. decomposer

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cuscuta (dodder) is a genus of about 100 – 170 species of yellow, orange or red (rarely green) parasitic plants.

Multiple choice

Energy transferred from one trophic level to another is

  1. 5%

  2. 10%

  3. 15%

  4. 20%

  5. -
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

According to 10% law, during the transfer of energy from organic food from one trophic level to the next, only about 10% of the energy from organic matter is stored as flesh. The remaining is lost during transfer, broken down in respiration or lost to incomplete digestion by higher trophic levels.

Multiple choice

Nutrition is defined as

  1. an organism's food

  2. the process which involves digestion

  3. the way an organism obtains food

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

Nutrition is defined as the way an organism obtains food and nutrients by the process of digestion.