Tag: meaning of life

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Questions Related to meaning of life

Multiple choice zoology meaning of life energy flow and loss energy flow in a food chain energy flows

Flow of energy declines from low to higher trophic level in ecosystem, is mainly explained by

  1. First law of thermodynamics

  2. Second law of thermodynamics

  3. Both of the above

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

Ecosystem require a constant input of energy as every component of an ecosystem is regularly dissipating energy. Two laws of thermodynamics govern this flow of energy. 

According to first law of thermodynamics, energy can be transformed as well as transferred but is neither created nor destroyed. 
According to second law of thermodynamics, every activity and energy transformation is accompanied by dissipation of energy. 

The maximum energy in an ecosystem is available at lowest or producer level and as energy is transferred from producers to successively higher levels energy level gets diminished. Thus, the correct answer is option B.

Multiple choice zoology meaning of life energy flow and loss energy flow in a food chain energy flows

The importance of ecosystem lies in

  1. Cycling of materials

  2. Flow of energy

  3. Both A and B

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

The ecosystem is an interaction between living beings (biotic component) and their physical environment (abiotic component).

The most important characteristics of any ecosystem are energy flow and cycling of materials. Green plants trap solar energy and convert it into a usable form, which is passed on to successive levels through food chains and food webs. The other important characteristic of the ecosystem is cycling of materials. This is called as the biogeochemical cycle, in which decomposers release nutrients back to the environment to maintain the ecosystem. Thus, the correct answer is option C.

Multiple choice zoology meaning of life energy flow and loss energy flow in a food chain energy flows

Select correct answers :
(1) Flow of energy
(2) Flow of materials
(3) Flow information
(4) Flow of smoke

  1. 1, 2, 3 correct

  2. 1 and 2 correct

  3. 2 and 4 correct

  4. 1 and 3 correct
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ecosystems are characterized by the flow of energy, the cycling of materials (nutrients), and the flow of information (e.g., biological signals). Smoke is not a standard component of ecosystem functional flow.

Multiple choice zoology meaning of life energy flow and loss energy flow in a food chain energy flows

In terrestrial ecosystem, maximum energy is present in

  1. $T _3$
  2. $T _2$
  3. $T _1$
  4. $T _4$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The first trophic level is represented as T$ _1$. It includes producers. The second trophic level is represented as T$ _2$. It includes primary consumers. Similarly, third trophic level is represented as T$ _3$. It includes secondary consumers. In terrestrial ecosystem, maximum energy is present in T$ _1$, that is producers.

Thus, the correct answer is 'T$ _1$.' 

Multiple choice zoology meaning of life energy flow and loss energy flow in a food chain energy flows

What percent of assimilated energy is used in respiration by the herbivores?

  1. 20%

  2. 30%

  3. 40%

  4. 60%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Large amount of assimilated energy is used in respiration. In herbivores, 30% of assimilated energy is used in respiration. Herbivores are more efficient in using energy for their growth and development than animals. Hence, plants grow faster than animals. 

Thus, the correct answer is '30%.'

Multiple choice zoology meaning of life energy flow and loss energy flow in a food chain energy flows

In an ecosystem, which of the following shows one-way passage?

  1. Free energy

  2. Carbon

  3. Nitrogen

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

Energy flow is the amount of energy that flows from one trophic level to another trophic level in an ecosystem. It is unidirectional or one-way passage. In an ecosystem, flow of free energy occurs through different trophic levels. Producers or plants obtain their energy from the sun by photosynthesis. The primary consumers (herbivores) obtain their energy from the producers. The secondary consumers (carnivores) obtained their energy by using herbivores as a source of food and so on. The energy present at each successive trophic level is 10% of the previous trophic level.

Thus, the correct answer is 'Free energy.'

Multiple choice zoology meaning of life energy flow and loss energy flow in a food chain energy flows

Path of energy flow in an ecosystem is 

  1. Herbivores > Producers > Carnivores -> Decomposers

  2. Herbivores > Carnivores >Producers > Decomposers

  3. Producers > Carnivores > Herbivores > Decomposers

  4. Producers >Herbivores > Carnivores > Decomposers
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ecosystem is made up of living and nonliving things. Living things or biotic things include plants and animals. Nonliving things or abiotic things include air, water, land.  It is composed of organisms interacting within communities. The driving force for an ecosystem is solar energy. Producers use solar energy to synthesize their food by the process of photosynthesis. From producers, the energy is transferred to herbivores. Herbivores eat producers. The energy is transferred from herbivores to carnivores. Carnivores eat herbivores. From carnivores, the energy is transferred to decomposers. They decompose organic matter of plants and animals.

Thus, the correct answer is 'Producers >Herbivores > Carnivores > Decomposers.'

Multiple choice zoology meaning of life energy flow and loss energy flow in a food chain energy flows

Which of the following receives the maximum energy?

  1. Producers

  2. Decomposers

  3. Primary consumers

  4. Secondary consumers
Reveal answer Fill a bubble to check yourself
A 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. When food energy passes from producers to herbivores to carnivores, only 10% of energy is transferred from one trophic level to another trophic level. Hence, producers receives the maximum energy.
Thus, the correct answer is 'Producers.'
Multiple choice zoology meaning of life energy flow and loss energy flow in a food chain energy flows

Each successive trophic level has

  1. Less total energy

  2. More total energy

  3. Increased total energy

  4. Non estimated energy contents
Reveal answer Fill a bubble to check yourself
A 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, the pyramid of energy is always upright. 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 'Less total energy.'

Multiple choice zoology meaning of life energy flow and loss energy flow in a food chain energy flows

Loss of energy from one trophic level to next higher trophic level is

  1. 30%

  2. 40%

  3. 60%

  4. 90%
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

According to the Lindeman's trophic efficiency rule, the 10% of energy is transferred from one trophic level to the next successive trophic level. The rest of the energy, that is 90% of energy is lost during transfer of energy from one trophic level to next higher trophic level. The first trophic level has the maximum energy. 

Thus, the correct answer is '90%.'