Tag: zoology

Questions Related to zoology

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

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

  1. Are heat

  2. Increase entropy

  3. Are not usable to do work

  4. All of these

Show answer
Correct Option: D
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'. 

The energy flows from autotroph to the heterotrophs.

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

  1. True

  2. False

Show answer
Correct Option: A
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'.

Ecosystem is not accepted by which law of thermodynamics ? 

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

  1. 1 st law

  2. Zeroth law

  3. 2 nd law

  4. 3rd law

Show answer
Correct Option: A
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'.

Energy of motion is also known as:

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

  1. Dynamic energy

  2. Kinetic energy

  3. Sensible heat energy

  4. Static energy

Show answer
Correct Option: B

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,

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

  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

Show answer
Correct Option: B

Energy transformation through the food chain is

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

  1. Regular

  2. Comfortable

  3. Proposed

  4. Inefficient

Show answer
Correct Option: D

What is an average incident energy?

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

  1. 3000kcal/m2/day

  2. 2000kcal/m2/day

  3. 5000kcal/m2/day

  4. 6000kcal/m2/day

Show answer
Correct Option: A

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

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

  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

Show answer
Correct Option: D
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. 

Energy transfer from one trophic level to another is

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

  1. 10%

  2. 5%

  3. 15%

  4. 20%

Show answer
Correct Option: A
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.

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

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

  1. First law of thermodynamics

  2. Second law of thermodynamics

  3. Newtons second law

  4. Newtons third law

Show answer
Correct Option: B
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.'