Tag: ecosystems

Quizzes (8) Questions (118)

Questions Related to ecosystems

Multiple choice zoology ecosystems decomposition in ecosystem ecosystem productivity and decomposition producers, consumers and decomposers

Which of the following process is involved in the processing of manures?

  1. The decomposition of animal excreta

  2. Plant waste

  3. Above both options are correct

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

Manure is prepared by the decomposition of animal excreta and plant waste.

So, the correct answer is 'above both options are correct'

Multiple choice zoology ecosystems decomposition in ecosystem ecosystem productivity and decomposition producers, consumers and decomposers

Which of the following statement regarding decomposition is false?

  1. Warm and moist environment favors decomposition.

  2. Decomposition rate is slower if detritus is rich in chitin and lignin.

  3. Earthworm is a detritivore.

  4. Precipitation of soluble inorganic nutrients into the soil horizon of unavailable salt is called as mineralization.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Decomposition takes part in recycling of biogeochemicals and creating space for newer generations of organisms. A number of processes are involved in decomposition. 

They are grouped into three categories- 
(i) Fragmentation of detritus carried out by earthworms, termites, millipedes etc. 
(ii) Catabolism carried out by decomposers, which secrete digestive enzymes over the detritus and change insoluble complex organic substances into  simple and soluble organic and inorganic substances. 
(iii) Leaching in which soluble substances formed during decomposition are passed to deeper layers of soil. 
The process of decomposition is favoured by warm and moist environment, because it favours growth of decomposers. 
Mineralization is the release of inorganic substances both non-mineral, example carbon dioxide and water; and minerals like calcium, magnesium, potassium, etc from organic matter.
In short, mineralisation is the process by which humus is further degraded by some microbes to release inorganic substances.
Thus, the correct answer is option D.

Multiple choice zoology ecosystems decomposition in ecosystem ecosystem productivity and decomposition producers, consumers and decomposers

Passage of minerals from top soil to subsoil through seepage of water is known as

  1. Leaching

  2. Percolation

  3. Conduction

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

Leaching is the process where water-soluble substances, such as minerals, are washed out from the topsoil into the lower soil layers (subsoil) by percolating water.

Multiple choice zoology ecosystems decomposition in ecosystem ecosystem productivity and decomposition producers, consumers and decomposers

Downward passage of mineral, from upper soil layer to lower soil strata is called

  1. Percolation

  2. Leaching

  3. Weathering

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

A liquid when slowly passes through a filter, this is called percolation.

Leaching is the natural process by which water soluble substances (such as calcium, fertilizers, pesticides) are washed out from soil or wastes in the downward passage from upper soil layer to lower soil strata.
Breakdown of rocks at the Earth's surface, by the heavy rainfall, extremes of temperature, and biological activity is called weathering.
Runaway is the passing of soil and other substances by rain.
Thus, the correct answer is option (B).

Multiple choice zoology ecosystems decomposition in ecosystem ecosystem productivity and decomposition producers, consumers and decomposers

For recycling of materials which one is most necessary  ______________.

  1. producers

  2. Consumers

  3. Decomposers

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

The decomposers are heterotrophic organisms that break up the dead bodies of plants and their waste products into smaller bits or molecules. The reducers release molecules to the environment as chemical to be used

again by the producers.
So, the correct answer is 'Decomposers'

Multiple choice zoology ecosystems decomposition in ecosystem ecosystem productivity and decomposition producers, consumers and decomposers

In the absence of decomposers, ecosystem functioning is adversely affected due to

  1. Blocking of energy flow

  2. Blocking of mineral cycling

  3. Blocking of solar energy to herbivores

  4. Rate of decomposition of other components will increase
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. Trophic levels in a food chain are formed by producers, consumers and decomposers. In the given food chain, plants are producers. The animals eating plants are called as primary consumers and animals eating primary consumers are called as secondary consumers. Decomposers are those which decomposes the waster organic matter and release energy back in the environment. They cycle the various minerals between environment and living organisms. Hence, in the absence of decomposers, ecosystem functioning is adversely affected due to blocking of mineral cycling.
Thus, the correct answer is 'Blocking of mineral cycling.'
Multiple choice zoology ecosystems decomposition in ecosystem ecosystem productivity and decomposition producers, consumers and decomposers

Pheretima and its close relatives obtain nourishment from

  1. Decaying fallen leaves and soil organic matter

  2. Soil insects

  3. Small pieces of fresh fallen leaves of Maize and others

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

Pheretima is a genus of earthworm. Pheretima and its close relatives obtain nourishment from decaying fallen leaves and soil organic matter. They are called as decomposers. They decomposes the dead organic matter and releases nutrients back into the environment.

Thus, the correct answer is 'Decaying fallen leaves and soil organic matter.'

Multiple choice zoology ecosystems decomposition in ecosystem ecosystem productivity and decomposition producers, consumers and decomposers

Slow rate of decomposition of fallen logs in nature is due to

  1. Anaerobic environment around them

  2. Low cellulose contents

  3. Low moisture content

  4. Poor nitrogen content
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The slow rate of decomposition of fallen logs in nature is due to their low moisture content The cellulose is in high amount in fallen logs. 

Decomposers break down dead plants and animals. They also break down the waste (poop) of other organisms. Decomposers are very important for any ecosystem. Low moisture content will lead to a decrease in the number of decomposers because decomposers require an optimum moisture for their proper growth and functioning.
So the answer is 'Low moisture content'.