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 zoology ecosystem : structure and function biogeochemical cycles - sedimentary biogeochemical cycle nitrogen and phosphorus cycles

Phosphorus cycle is

  1. Gaseous cycle

  2. Perfect cycle

  3. Imperfect cycle

  4. Partly gaseous and partly sedimentary
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The phosphorus cycle is considered an imperfect cycle because a significant portion of phosphorus is lost to deep ocean sediments and is not readily recycled back into the biosphere on a short timescale.

Multiple choice zoology ecosystem : structure and function biogeochemical cycles - sedimentary biogeochemical cycle nitrogen and phosphorus cycles

Which one is a sedimentary cycle?

  1. Oxygen cycle

  2. Nitrogen cycle

  3. Hydrogen cycle

  4. Phosphorus cycle

  5. Carbon cycle
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

There are 4 layers of Earth, namely lithosphere (land), hydrosphere (water), biosphere (living), and atmosphere (air). Lithosphere of Earth makes up the hard and rigid outer layer of the Earth. It is reservoir of phosphorus. The largest reservoir of phosphorus is sediments or sedimentary rocks. Hence, phosphorous cycle represents sedimentary type of nutrient cycle or simply sedimentary cycle.

Thus, the correct answer is 'Phosphorous cycle.' 

Multiple choice zoology ecosystem : structure and function biogeochemical cycles - sedimentary biogeochemical cycle nitrogen and phosphorus cycles

Which one is the Sedimentary Cycle?

  1. Oxygen Cycle

  2. Nitrogen Cycle

  3. Hydrogen Cycle

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

Sedimentary cycles are those cycles that involve earthbound elements like, calcium, sulfur, phosphorous etc. The phosphorus cycle does not involve the atmosphere, it mainly cycles through water, soil and sediments. 


So, the correct option is 'Phosphorous cycle'.

Multiple choice zoology ecosystem : structure and function biogeochemical cycles - sedimentary biogeochemical cycle nitrogen and phosphorus cycles

Which one of the following is sedimentary cycle? 

  1. Carbon

  2. Hydrogen

  3. Nitrogen

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

Sedimentary cycles are those cycles which include the weathering of rocks and erosion of minerals along with its circulation in the environment and back to earth crust. It includes those of iron, calcium, phosphorus and other more earthbound elements. It is the other name of phosphorus cycle. It is because of the sedimentary rocks, as well as the other type of rocks on weathering, gives rise to the cycling of phosphorus.

So, the correct answer is option D.

Multiple choice zoology ecosystem : structure and function biogeochemical cycles - sedimentary biogeochemical cycle nitrogen and phosphorus cycles

Which of the following is the major source of phosphorus?

  1. Plants

  2. Animals

  3. Crystalline rocks

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

Phosphorus is a critical element. In living systems, it occurs in nucleic acids, nucleotides including ATP, bones, teeth, phospholipids etc. It is obtained from the soil as orthophosphates. Organic phosphorous circulates in nature from plants to animals. Phosphate is released by decomposers back to the soil. The reservoir pool for phosphorus is phosphates in rocks from which the phosphorus is slowly transferred to cycling pool.

Multiple choice zoology ecosystem : structure and function biogeochemical cycles - sedimentary biogeochemical cycle nitrogen and phosphorus cycles

Phosphorus cycles in the form of ____________.

  1. $HPO^{3-}$
  2. $P^{2}$ (gas)
  3. $PO _{4}^{3-}$
  4. $Al _{2}(PO _{4}) _{3}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Phosphorus is obtained from soil as orthophosphate $(PO _{4}^{3-})$. Organic phosphorus circulates in nature from plants to animals. Phosphate is released by decomposers (Phosphatising bacteria) back to soil.

Multiple choice zoology ecosystem : structure and function biogeochemical cycles - sedimentary biogeochemical cycle nitrogen and phosphorus cycles

Which of the following represents sedimentary type of nutrient cycle?

  1. Nitrogen

  2. Carbon

  3. Phosphorus

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

There are 4 layers of Earth, namely lithosphere (land), hydrosphere (water), biosphere (living), and atmosphere (air). Lithosphere of Earth includes the crust and the uppermost mantle. It makes up the hard and rigid outer layer of the Earth. It is reservoir of phosphorus. The largest reservoir of phosphorus is sediments or sedimentary rocks. Hence, phosphorous represents sedimentary type of nutrient cycle. 

Thus, the correct answer is 'Phosphorous.' 

Multiple choice zoology ecosystem : structure and function biogeochemical cycles - sedimentary biogeochemical cycle nitrogen and phosphorus cycles

Lithosphere is reservoir of

  1. Carbon

  2. Oxygen

  3. Phosphorus

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

There are 4 layers of Earth, namely lithosphere (land), hydrosphere (water), biosphere (living), and atmosphere (air). Lithosphere of Earth includes the crust and the uppermost mantle. It makes up the hard and rigid outer layer of the Earth. It is reservoir of phosphorus. The largest reservoir of phosphorus is sedimentary rocks. 

Thus, the correct answer is 'Phosphorous.' 

Multiple choice biology ecosystem : structure and function biogeochemical cycles - sedimentary biogeochemical cycle nitrogen and phosphorus cycles

Sedimentary cycle having a small gaseous component also
is found in

  1. 'P' cycle

  2. 'S' cycle

  3. 'N' cycle

  4. 'C' cycle
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The sulfur cycle is primarily a sedimentary cycle, but it has a significant gaseous component (such as sulfur dioxide and hydrogen sulfide) that allows it to circulate through the atmosphere.

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.