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

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.

Multiple choice

Energy enters an ecosystem through

  1. herbivores

  2. carnivores

  3. producers

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

Producers or green plants perform photosynthesis and use sunlight as a source of energy.