Tag: zoology

Quizzes (289) Questions (5869)

Questions Related to zoology

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

If $5$ joules of energy is available at producer level then find the energy transferred to the lion in the following food chain.
Plants $\rightarrow$ Deer $\rightarrow$ Lion

  1. $5$ joules
  2. $0.5$ joules
  3. $0.05$ joules
  4. $0.005$ joules

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • According to the 10% rule when energy is passed in an ecosystem from one tropic level to the next, only 10% of the energy is passed on and the rest is wasted.
  • 10% of (10% of 5 joules)=Energy transferred to the lion.
  • So, the correct choice is '0.05 joules'.
Multiple choice zoology meaning of life energy flow and loss energy flow in a food chain energy flows

Grass $\rightarrow$ Deer $\rightarrow$ Tiger
In this food chain, the biomass of grass is $1$ tonne. The tiger biomass will be:

  1. $100 \,kg$
  2. $10 \,kg$
  3. $1 \,kg$
  4. $1000 \,kg$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

According to 10% law of Lindemann, if 1 tonne (1000 kg) biomass is present in grass, only 10% of it means 100 kg will go into deer and in tiger the biomass will be only 10 kg, i.e. 10% of deer's biomass.

So, the correct option is '10kg'.

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

An ecosystem is maintained by the flow of energy derived from the Sun. Energy trapped by plants varies from ecosystem to ecosystem. The table given shows energy absorption by different vegetations of different ecosystem.

Vegetation $\%$ of energy absorption
a) Aquatic ecosystem $15-16\%$
b) Grassland $14-15\%$
c) Mixed forest $13-14\%$
d) Modern $C _3$ crops $12-13\%$
e) Modern $C _4$ crops $10-12\%$

Find the correct match.

  1. C

  2. B

  3. A

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

An ecosystem is normally an open system because there are a continuous and variable entry and loss of energy and material. The ecosystem is the basic fundamental unit of ecology which includes both the organism and the non-living environment is influencing the property of each other and is necessary for the maintenance of life. The whole Earth can be known as biosphere or ecosphere.

Various plant and various vegetation have a different level of energy absorption. There is a grassland ecosystem and a forest ecosystem and many other.
So, the correct option is 'C' 

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

The pyramid of energy is the best representation of an ecosystem because it indicates

  1. Relation of all plants and animals

  2. Total energy present in an ecosystem

  3. The rate of flow of energy through the food chain

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • The pyramid of energy shows the relationship between the flow of energy and different trophic level.
  • The pyramid of energy depicts the flow of energy in the ecosystem.
  • The source of energy in an ecosystem is the sun, the producers trap the solar energy and use it for photosynthesis which is in turn eaten by organisms of the higher trophic level such as primary consumers, secondary consumers.
  • So, the correct answer is 'The rate of flow of energy through the food chain'.
Multiple choice zoology meaning of life energy flow and loss energy flow in a food chain energy flows

The importance of ecosystem maintenance lies in

  1. Cycling of materials

  2. Flow of energy

  3. Both of the above

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

An ecosystem comprises of biotic and abiotic components which interact with each other to maintain an equilibrium. A major focus of ecosystem ecology is on functional processes, ecological mechanisms, that maintain the structure and services produced by ecosystems. These include primary productivity (production of biomass), decomposition, and trophic interactions. The various trophic levels of an ecosystem interact with each other by  a flow of energy and cycling of materials from one trophic level to the other.

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

Which of the cycle is concerned with energy flow in the ecosystem?

  1. Food cycle
  2. O$ _2$ cycle
  3. Cl$ _2$ cycle

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

A food cycle is associated with energy flow in the ecosystem. It contains several trophic levels which are interdependent to each other for energy. Only 10% of energy can be transferred to the successive trophic level and rest 90% get utilise in their life processes.

Thus, the correct answer is option A.

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

One way cycle is

  1. CO$ _2$ cycle
  2. H$ _2$O cycle

  3. Free energy cycle
  4. O$ _2$ cycle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Free energy cycle is the unidirectional cycle in our ecosystem. In other cycles like oxygen cycle, carbon dioxide cycle and water cycle, the basic elements are circulated and cycled whereas, in free energy cycle, energy flows from solar energy to producers and then consumers to decomposers. 


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

The transfer of energy from a level to another is governed by Law of thermodynamics. The average efficiency of energy transfer from herbivores to carnivores level is

  1. 10%

  2. 25%

  3. 5%

  4. 50%
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The number of trophic levels in the grazing food chain is restricted as the transfer of energy follows 10 per cent law only 10 per cent of the energy is transferred to each trophic level from the lower trophic level.

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

10% energy transfer law in food chain was first given by

  1. Lindeman

  2. Tansley

  3. Elton

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

The ten percent law for the transfer of energy from one trophic level to the next was introduced by Raymond Lindeman (1942). 

According to this law, during the transfer of energy from organic food from one trophic level to the next, only about ten percent of the energy from organic matter is stored as flesh. The remaining is lost during transfer, broken down in respiration, or lost to incomplete digestion by higher trophic levels.