Tag: zoology

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Questions Related to zoology

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

Decomposition is a type of ______ 

  1. aerobic respiration

  2. anaerobic respiration

  3. exothermic reaction

  4. none of these.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When organic materials decompose in the presence of oxygen, the process is called “aerobic.” The aerobic process is most common in nature. For example, it takes place on ground surfaces such as the forest floor, where droppings from trees and animals are converted into relatively stable humus. There is no accompanying bad smell when there is adequate oxygen present. In aerobic decomposition, living organisms, which use oxygen, feed upon the organic matter. They use the nitrogen, phosphorus, some of the carbon, and other required nutrients. Much of the carbon serves as a source of energy for the organisms and is burned up and respired as carbon dioxide. Since carbon serves both as a source of energy and as an element in the cell protoplasm, much more carbon than nitrogen is needed. Generally, about two-thirds of carbon is respired as $C0 _2$, while the other third is combined with nitrogen in the living cells. However, if the excess of carbon over nitrogen (C: N ratio) inorganic materials being decomposed is too great, biological activity diminishes. Several cycles of organisms are then required to burn most of the carbon. 

So, the correct answer is A.

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

The rotting dead matter in the soil is called 

  1. Weathering

  2. Humus

  3. Soil profile

  4. Top soil
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Dead plants and animals are degraded in soil by decomposing bacteria and fungi. The material formed after this decomposition activity is called humus. It is very rich in nutrients and black in color. Greater the amount of humus more is the soil productivity. Thus the correct answer is option B.
Multiple choice zoology ecosystems decomposition in ecosystem ecosystem productivity and decomposition producers, consumers and decomposers

.......... play a very important role in  decomposition of organic matter in the soil

  1. Cat

  2. Plants

  3. Microorganisms

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

Micro-organisms dwell in soil. They contribute to various processes related to the soil, plants and atmosphere. One of the processes is decomposition of dead remains of plants and animals

So, the correct answer is 'micro-organisms'

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

Which of these help in decomposition of organic wastes?

  1. Bacteria

  2. Fungi

  3. Earthworm

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

When organic wastes such as leftover food, plant and animals waste is collected in heaps, decomposers such as bacteria, insects such as earthworms and fungi act on it and break it down. This product which is formed by this action of decomposers is called compost. This process is called composting and the compost can be used to increase the plant yield. Thus the correct answer is option D.

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

Which of the following gases is/are produced by decomposers during the decaying process?

  1. Only carbon dioxide gas

  2. Only carbon dioxide and nitrogen gases

  3. Only oxygen gas

  4. Only carbon dioxide and oxygen gases
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Decomposers feed on the dead or decaying organic matter(carbohydrate, proteins and lipids ) and produce nitrogen and carbon dioxide gases as an organic matter are mainly made up of carbon, oxygen, hydrogen and nitrogen. Thus, the correct answer is option B.

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

The release of inorganic nutrient from the degradation of organic matter is called as

  1. Fragmentation

  2. Humification

  3. Mineralisation

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

Mineralization is the specific stage of decomposition where microbial action converts organic nutrients into inorganic forms that plants can absorb.

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

During the process of decomposition in which stage complex organic matter convert into inorganic ions and salts by fungi?

  1. Mineralisation

  2. Catabolism

  3. Fragmentation

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

Mineralisation is a process in which complex organic matter present in humus is converted into inorganic salts and ions. It is done by the action of saprophytic fungi.