Tag: zoology

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

Choose the correct answers from the alternatives given .
Diffuse, disorganised forms of energy

  1. Are heat

  2. Increase entropy

  3. Are not usable to do work

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

Entropy is the measurement of this disorder in energy, in which heat energy, is not usable, is considered disorganized. Thus, a system with a large amount of usable energy has low entropy, a system with little usable energy has high entropy. Based on the second law of thermodynamics, entropy will continually increase in the universe as energy becomes more and more disorganized.

So, the correct option is 'All of the above'. 

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

The energy flows from autotroph to the heterotrophs.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Energy flow always occurs from lower trophic level to a higher trophic level. According to Lindeman's law of trophic efficiency, about 10% of energy is transferred from one trophic level to the higher trophic level. Autotrophs are the producers. They occupy the first trophic level. Heterotrophs are consumers which occupy subsequent trophic levels as primary, secondary and tertiary consumers. Thus, energy transfer takes place from autotrophs to heterotrophs.
Hence, the statement given in the question is correct.
So, the correct answer is 'True'.
Multiple choice zoology meaning of life energy flow and loss energy flow in a food chain energy flows

Ecosystem is not accepted by which law of thermodynamics ? 

  1. 1 st law

  2. Zeroth law

  3. 2 nd law

  4. 3rd law
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

First law of thermodynamics defines that the energy neither created nor destroyed but can only be transformed. Ecosystem is not accepted by the 1st law of thermodynamics because the energy is created.

So, the correct option is '1 st law'.

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

Two objects, A and B, have the same mass but the specific heat of A is larger than B. If both objects absorb equal amounts of energy,

  1. A will become warmer than B

  2. B will become warmer than A

  3. Both A and B will warm at the same rate

  4. A will get warmer, but B will get colder
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The formula for heat absorption is Q = mc * deltaT. Since Q and m are the same for both, deltaT = Q / (mc). If the specific heat c is larger for A, the temperature change deltaT will be smaller for A. Therefore, B will become warmer than A.

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

The correct sequence of components through which energy may pass from initial source, through an ecosystem is

  1. Sun $\rightarrow$ Autotrophs $\rightarrow$ Heterotrophs $\rightarrow$ Environment $\rightarrow$ Space
  2. Space $\rightarrow$ Environment $\rightarrow$ Heterotrophs $\rightarrow$ Autotrophs $\rightarrow$ Sun
  3. Sun $\rightarrow$ Space $\rightarrow$ Environment $\rightarrow$ Heterotrophs $\rightarrow$ Autotrophs
  4. Sun $\rightarrow$ Space $\rightarrow$ Environment $\rightarrow$ Autotrophs $\rightarrow$ Heterotrophs
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The energy flow starts from the sun. The light energy enters the space and then into the atmosphere. The energy in the atmosphere is captured by the plants which are autotrophs. Plants convert this light energy to chemical energy by photosynthesis. The food prepared by the plants is consumed by the heterotrophs. The heterotrophs are utilized by the decomposers.

So, the correct answer is option D. 

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

Energy transfer from one trophic level to another is

  1. 10%

  2. 5%

  3. 15%

  4. 20%
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The amount of energy at each trophic level decreases as it moves through an ecosystem. As little as 10 percent of the energy at any trophic level is transferred to the next level; the rest is lost largely through metabolic processes as heat. The efficiency with which energy or biomass is transferred from one trophic level to the next is called as the ecological efficiency. Consumers at each level convert on average only about 10% of the chemical energy in their food to their own organic tissue (the ten-percent law). 

Therefore, the correct answer is option A.

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

Flow of energy declines as it passes from lower to higher trophic level. This is explained by

  1. First law of thermodynamics

  2. Second law of thermodynamics

  3. Newtons second law

  4. Newtons third law
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Flow of energy declines as it passes from lower to higher trophic level. This is explained by second law of thermodynamics. According to this law, 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 'Second law of thermodynamics.'