Tag: zoology

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Questions Related to zoology

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

The best source of energy in the environment is

  1. Water

  2. Soil

  3. Trees

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

Trees are autotrophs or producers in an ecosystem and trap solar energy. The solar energy is converted into chemical energy, which is stored in seeds, fruits and other storage organs. Thus, producers like trees are the source of chemical energy for all the heterotrophic organisms. All the heterotrophs either directly or indirectly depend on the food, synthesized by producers like trees. These organisms directly cannot use solar energy.

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

10% law of flow of energy in ecosystem was proposed by

  1. Lindeman

  2. Carl Mobius

  3. Tansley

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

Only 10 percent of the gross productivity of producer is entrapped by herbivores for their body-building. Herbivores are eaten by primary carnivores. Only 10 percent of the herbivore productivity is utilised by carnivores. Higher carnivores are similarly able to retain only 10 percent of energy present in primary carnivores. This is called as 10 percent law by Lindeman.

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

Energy enters an ecosystem through 

  1. Herbivores

  2. Producers

  3. Carnivores

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

A food chain is series of plants/animals which are interrelated in the form of organism being eaten as food by the other. It consists of producers, consumers and decomposers. The energy enters in an ecosystem through producers. Plants are producers which convert solar energy into chemical energy through photosynthesis. From producers, the energy is then transferred to the herbivores and carnivores. The animals eating plants are called as primary consumers or herbivores and animals eating primary consumers are called as secondary consumers or carnivores. Decomposers are those which decay the waster organic matter and release energy back in the environment.

Thus, the correct answer is 'Producers.'

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

Transfer of energy in different trophic levels of an ecosystem is

  1. Bioenergetics

  2. Biosystem

  3. Geobiocoenosis

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

Flow of energy in different trophic levels of an ecosystem is called as bioenergetics. It is also called as energy flow. In this, there is flow of energy through the food chain. Solar energy is converted to chemical energy by photosynthetic plants. From plants, the energy is transferred to primary consumers and secondary consumers in a food chain. Decomposers release energy back to the environment by decomposing organic waste matter.

Thus, the correct answer is 'Bioenergetics.'

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

Amount of energy transferred from one trophic level to next is

  1. 1.5%

  2. 10%

  3. 15%

  4. 20%
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. 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 '10%.'
Multiple choice zoology meaning of life energy flow and loss energy flow in a food chain energy flows

Efficiency of energy transfer from one trophic level to the higher trophic level is called

  1. Assimilation efficiency

  2. Exploitation efficiency

  3. Lindeman's trophic efficiency rule

  4. Gross primary productivity
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Lindeman's trophic efficiency rule was introduced by Reymond Lindeman. According to this rule, the 10% of transfer of energy is transferred from one trophic level to the next successive trophic level. The rest of the energy is lost during transfer of energy and during respiration. The first trophic level has the maximum energy. 

Thus, the correct answer is 'Lindeman's trophic efficiency rule.'

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

The amount of usable energy remains constant as it is passed from one trophic level to another.

  1. True

  2. False

  3. Either

  4. Neither
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Organisms depend on the organisms of lower trophic levels for their energy requirements. There is a certain mass of living matter present in a trophic level at a particular time which is called standing crop and measured as mass of living organisms i.e. biomass. The biomass of species is measured in terms of dry weight. Transfer of energy from one trophic level to next trophic level follows 10 percent law known as Lindeman's law of trophic efficiency which states that the efficiency of energy transferred from one trophic level to the next higher trophic level is about 10%. So the energy decreases as it is transferred to subsequent trophic levels.
Hence, the statement given in the question is incorrect.
So, the correct answer is 'False'.
Multiple choice zoology meaning of life energy flow and loss energy flow in a food chain energy flows

The maximum energy is stored at following trophical level in any ecosystem

  1. Producers

  2. Herbivores

  3. Carnivores

  4. Top carnivores
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A. Producers are the green plants which synthesise their own food using sunlight.
B. Herbivores are primary consumers which feed on producers.
C. Carnivores are secondary consumers who feed primary consumers.
D. Top carnivores are tertiary consumers who feed on other carnivores.
Maximum energy is stored in the trophic levels of producers as they synthesise their own food. They occupy the lowest trophic level and energy is transferred from them to higher subsequent trophic levels. As the energy decreases each time it is transferred to the next higher trophic level, the lowest trophic level i.e. producers, have maximum energy.
So, the correct answer is 'Producers'.  
Multiple choice zoology meaning of life energy flow and loss energy flow in a food chain energy flows

The energy within an ecosystem is fixed and never changes.

  1. True

  2. False

  3. Either

  4. Neither
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
In an ecosystem, sun is the ultimate source of energy. The solar energy is converted into chemical energy by plants and is stored in them. This energy is then passed to other organisms as they feed on producers. The transfer of energy from one trophic level to other follows 10 percent law according to which only 10% of the energy is passed from one trophic level to next and rest of the energy is lost in respiration and in the form of heat. Thus, energy within an ecosystem is not fixed.
Hence, the statement given in the question is not correct.
So, the correct answer is 'False'.