Tag: lichens ( the nature's pioneers )

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Questions Related to lichens ( the nature's pioneers )

Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

In a highly industrialised area, which of the following will be virtually absent?

  1. Algae

  2. Lichens

  3. Ferns

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

In a highly industrialized area, lichens will be virtually absent as these area will be highly polluted and lichens are useful bioindicators for air and water pollution specially for sulphur dioxide pollution. Their efficient absorption systems results in rapid accumulation of sulphur when exposed to high levels of sulphur dioxide pollution and the algal partner are most affected by the sulphur dioxide as chlorophyll is destroyed and photosynthesis is inhibited.

So, the correct answer is option B.

Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

In organisms like lichens, the number of partners are

  1. Three

  2. Two

  3. Four

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

Lichens have a symbiotic relationship. In this type of relationship, lichens live symbiotically. there is a symbiotic relationship between algae and fungi in lichens. Algae perform photosynthesis and provide with carbon compounds. Fungi provide protection and nutrition to algae. Thus, 2 organisms are involved in a lichen. 

So, option B " Two" is the correct answer.

Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

Lichen is usually cited as an example of symbiosis in plants where an algal and fungal species live together for their mutual benefit. Which of the following will happen if algal and fungal partners are separated from each other in laboratory conditions?

  1. Both will survive and grow normally and independent from each other.

  2. Both will die.

  3. Algal component will survive while the fungal component will die.

  4. Fungal component will survive while the algal component will die.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Algae are green photosynthetic organisms. They are autotropic as they perform the process of photosynthesis to prepare their own food. Lichens cannot prepare their own as they are non-photosynthetic. So, inn absence of lichens , algae can survive as they can prepare their own food. But lichens will starve and ultimately die. 

So, option C is the correct answer.

Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

Which of the following is the use of lichens in case of pollution?

  1. They treat the polluted water

  2. They act as bioindicators of pollution

  3. They promote pollution

  4. Lichens are not related with pollution
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Bioindicators are living organisms that respond in an especially clear way to a change in the environment. The hardy lichens are useful bioindicators for air pollution, especially sulfur dioxide pollution, since they derive their water and essential nutrients mainly from the atmosphere rather than from the soil. It also helps that, they are able to react to air pollutants all year round. Compared with most physical/chemical monitors, they are inexpensive to use in evaluating air pollution.
Lichens can also be used to measure toxic elemental pollutants and radioactive metals because they bind these substances in their fungal threads where they concentrate them over time. Environmental scientists can then evaluate this accumulation to determine the history of the local air
So, the correct answer is 'They act as bioindicators of pollution'
Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

Biological weathering of rock is caused by 

  1. Lichens

  2. Mosses

  3. Roots of plants

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • The weathering of rocks is responsible for the formation of soil. It occurs due to a variety of reasons like under the effect of lichens. 
  • Lichens cause the breakdown of rock materials and organic minerals. Thus they breakdown the surface of rocks.
  • Mosses also release different gases and cause the breakdown of rocks they grow on.
  • Roots of plants that grow on rocks cause cracks on the surface of rocks.
  • Thus, all these factors are responsible for the weathering of rocks.
Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

Which among the following is a good source of a natural dye of litmus? 

  1. Algae

  2. Fungi

  3. Lichen

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

The species of the lichen Rocella is used for the extraction of the dye which serves in the formation of litmus. The litmus papers are used for testing of the pH. The litmus paper turns blue at alkaline pH and red at acidic pH. The change in the pH can be analysed using the litmus papers. 

Thus, the correct answer is option C. 

Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

Which of the following is lichen?

  1. Apple moss

  2. Peat moss

  3. Reindeer moss

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

Reindeer moss is a type of lichen. It grows in arctic regions and is a bluish-grey organism. In winters, it provides food for reindeer. Apple moss, peat moss and club moss are typical mosses. 

So, option C " Reindeer moss" is the correct answer.

Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

Lichens show the symbiotic association between

  1. Algae and fungi

  2. Fungi and bacteria

  3. Bacteria and virus

  4. Fungi and roots of higher plants
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A lichen is a stable symbiotic association between a fungus and algae and/or cyanobacteria. The lichen symbiosis is thought to be a mutualism, as both the fungi and the photosynthetic partners, called as photobionts, benefit. The algal component photosynthesize and provide food for the fungus while the fungal component provide protection from the environment by its filament.
Thus, the correct answer is option A.
Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

Which are sensitive to sulphur dioxide pollution?

  1. Algae

  2. Mosses

  3. Lichens

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

The correct answer is 'lichens'

lichens are the most sensitive indicators of sulphur dioxide pollution as their growth is inhibited due to its presence. Sulphur gets accumulated in them destroying chlorophyll and inhibiting photosynthesis.