Tag: energy flow in an ecosystem

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Questions Related to energy flow in an ecosystem

Multiple choice zoology energy flow in an ecosystem the energy pyramid ecological pyramid ecological pyramids

Which type of pyramid of energy  is inverted?

  1. Grass land

  2. Tree

  3. Both (A) and (B)

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pyramid of energy is ecological pyramid that gives graphic representation of amount of energy trapped by different trophic levels per unit area. It is always upright because during transfer of energy from one trophic level to the next a lot of wastage occurs in feeding, digestion, assimilation and respiration i.e metabolism at each trophic level. Hence, organisms of each trophic level have more energy than each succeeding trophic level and less energy than organisms at previous trophic level. Thus, the correct answer is option D.

Multiple choice zoology energy flow in an ecosystem the energy pyramid ecological pyramid ecological pyramids

The pyramid that cannot be inverted in a stable ecosystem, is pyramid of

  1. Number

  2. Energy

  3. Biomass

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

Pyramid of energy is ecological pyramid, that represents the flow of energy from one trophic level to the next a lot of wastage occurs in metabolism and energy transfer. Maximum energy content is present in producers and least at top carnivore levels. Thus, the correct answer is option B.

Multiple choice zoology energy flow in an ecosystem the energy pyramid ecological pyramid ecological pyramids

The pyramid which cannot be inverted in a stable ecosystem is that of

  1. Biomass

  2. Number

  3. Energy

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

Flow of energy declines as it passes from lower to higher trophic level. The energy decreases from one trophic level to the next trophic level because energy is lost as metabolic heat during transfer of energy. Hence, the pyramid of energy is always upright in any ecosystem and it cannot be inverted in a stable ecosystem. When food energy passes from producers to herbivores to carnivores, only 10% of energy is transferred from one trophic level to another trophic level.

Thus, the correct answer is 'Energy.'

Multiple choice zoology energy flow in an ecosystem the energy pyramid ecological pyramid ecological pyramids

Relationships in an ecosystem can be depicted through

  1. Pyramid of energy

  2. Pyramid of biomass

  3. Pyramid of numbers

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

An ecological pyramid is a graphical representation showing relationships between organisms at different trophic level in an ecosystem. Pyramid of biomass is the graphical representation of total amount of living material at each trophic level of a food chain. Pyramid of numbers represent the number of individuals in each trophic level of a food chain. Pyramid of energy represents the amount of energy at each trophic level of a food chain. The ecological pyramid are either upright, inverted or spindle shaped.

Thus, the correct answer is 'All of the above.'

Multiple choice zoology energy flow in an ecosystem the energy pyramid ecological pyramid ecological pyramids

Ecological pyramids are of ______ types.

  1. Two

  2. Three

  3. Four

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

An ecological pyramid is a graphic representation of the relationship between organisms at various trophic levels in a food chain. Ecological pyramids are of 3 types, namely biomass, energy and number. Pyramid of Number represents the number of organisms at different trophic levels of food chain. Pyramid of biomass represents the biomass of organisms at different trophic levels of the food chain. Pyramid of energy represents the amount of energy at different trophic levels.

Thus, the correct answer is 'Three.' 

Multiple choice zoology energy flow in an ecosystem the energy pyramid ecological pyramid ecological pyramids

Which one has always an upright/ steeper vertical gradient?

  1. Pyramid of mass

  2. Pyramid of energy

  3. Pyramid of numbers

  4. Pyramid of energy in aquatic ecosystem
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pyramid of energy represents the amount of energy at each trophic level. In any ecosystem, flow of energy declines as it passes from lower to higher trophic level. This is explained by second law of thermodynamics. Hence, the pyramid of energy always has an upright or steeper vertical gradient. In this, the energy decreases from one trophic level to the next trophic level because energy is lost as metabolic heat during transfer of energy. When food energy passes from producers to herbivores to carnivores, only 10% of energy is transferred from one trophic level to another trophic level.

Thus, the correct answer is 'Pyramid of energy.'

Multiple choice zoology energy flow in an ecosystem the energy pyramid ecological pyramid ecological pyramids

Pyramid of energy is always upright indicating that

  1. Producers have the lowest energy conversion efficiency.

  2. Carnivorous have a better energy efficiency than herbivores.

  3. Energy conversion efficiency is same for all trophic levels.

  4. Herbivores have a better energy conversion efficiency than carnivores.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pyramid of energy represents the amount of energy at each trophic level. In any ecosystem, flow of energy declines as it passes from lower to higher trophic level. Hence, pyramid of energy is always upright indicating that herbivores have a better energy conversion efficiency than carnivores.  Each successive trophic level has less total energy. In this, the energy decreases from one trophic level to the next trophic level because energy is lost as metabolic heat during transfer of energy. When food energy passes from producers to herbivores to carnivores, only 10% of energy is transferred from one trophic level to another trophic level.

Thus, the correct answer is 'Herbivores have a better energy conversion efficiency than carnivores.'

Multiple choice zoology energy flow in an ecosystem the energy pyramid ecological pyramid ecological pyramids

Relationship between different organisms can best be studied by

  1. Food webs

  2. Pyramid of mass

  3. Pyramid of energy

  4. Eltonian pyramids
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Eltonian pyramid is also called as ecological pyramid. It is a graphical representation showing relationship between different organisms at different trophic level.
Food web is a connection between various food chains in an ecosystem.
Pyramid of mass represents the biomass of organisms at different trophic level.
Pyramid of energy represents the amount of energy present at each trophic level. 
Thus, the correct answer is 'Eltonian pyramid.'
Multiple choice zoology energy flow in an ecosystem the energy pyramid ecological pyramid ecological pyramids

Which of the following is not correct?

  1. In most ecosystems, the pyramids of numbers and biomass are upright.

  2. In tree dominated ecosystem, the pyramid of numbers is inverted.

  3. In deep water ecosystem, the pyramid of biomass is upright.

  4. Pyramid of energy expresses mainly the rate of food production.

  5. Total energy flow at successive trophic levels always decreases.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
a) Pyramid of numbers represents the number of organisms at each trophic level. Pyramid of biomass represents the biomass of organisms at each trophic level. In most ecosystems, the pyramids of numbers and biomass are upright.
b) In tree dominated ecosystem, the pyramid of numbers is inverted. The first trophic level contains plants. The second trophic level contains birds which are more in number as compared to number of plants.
c) In deep water ecosystem, the pyramid of biomass is upright. The biomass at first trophic level is maximum followed by second trophic level (primary consumer) followed by third trophic level (secondary consumer).
d) Pyramid of energy expresses mainly the amount of energy produced at a particular level and the rate at which it is transferred.
e) Similarly, the pyramid of energy is always upright. Total energy flow at successive trophic levels always decreases from first trophic level to another trophic level.

Thus, the correct answer is 'Pyramid of energy expresses mainly the rate of food production.'