Tag: botany

Questions Related to botany

Which one of the following lichens is used in cosmetics?

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

  1. Ochrolechia

  2. Roccella

  3. Ramalina

  4. Parmelia

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Correct Option: A

Choose the correct answers from the alternatives given.
Lichens :

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

  1. cannot reproduce

  2. need a nitrogen source to live

  3. are parasitic on trees

  4. are able to live in extreme environments

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Correct Option: D
Explanation:

Lichens can reproduce, do not need nitrogen source to live and is a symbiotic relationship between fungi and cyanobacteria. They are able to live in extreme conditions like on a bare rock. 

So, the correct option is 'are able to live in extreme environments'.

Match List I with List II and select the correct answer.

List I List II
a. Lichen $1$. Virus
b. Fungi $2$. Symboints
c. Cyanobacteria $3$. Decomposers
d. Bacteriophage $4$. Flagellate
$5$. Blue-green algae
botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

  1. A-$2$, B-$1$, C-$4$, D-$3$

  2. A-$1$, B-$3$, C-$5$, D-$4$

  3. A-$5$, B-$2$, C-$3$, D-$1$

  4. A-$2$, B-$3$, C-$5$, D-$1$

Show answer
Correct Option: A

Growth of Lichens on barren rocks is followed by the growth of____________.

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

  1. Moss

  2. Ferns

  3. Gymnosperms

  4. Algae

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Correct Option: A
Explanation:

The process of community development over time, which involves species in one stage being replaced by other species, is called ecological succession. It is divided as primary succession and secondary succession. An area is initially colonized by certain early-successional species such as Lichens, they are often the first organism to colonize an area that will undergo primary succession. Once new soil has formed in an area it gives way over time to mild-successional species, such as mosses and grasses, which in turn give way much later to late-successional species.

Who coined the term lichens?

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

  1. Linnaeus

  2. Theophrastus

  3. Alexopoulos

  4. None of the above

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Correct Option: B
Explanation:
Lichens are symbiotic associations i.e. mutually useful associations, between algae and fungi. The algal component is known as phycobiont and fungal component as mycobiont, which is autotrophic and heterotrophic, respectively. Algae prepare food for fungi and fungi provide shelter and absorb mineral nutrients and water for its partner.
The term Lichen was coined by 'Theophrastus'.
So, the correct answer is 'Option B'.

A structure is lichens that is similar to stomata in function is known as ____________.

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

  1. Soredium

  2. Isidium

  3. Cyphellae

  4. Cynalle

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Correct Option: A

There exists a close association between the alga and the fungus within a lichen. The fungus -

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

  1. Provides food for the alga

  2. Provides protection, anchorage and

    absorption for the alga

  3. Fixes the atomospheric nitrogen for the alga

  4. releases oxygen for the alga

Show answer
Correct Option: B
Explanation:

Lichens are symbiotic associations i.e. mutually useful associations, between algae and fungi. The algal component is known as phycobiont and fungal component as mycobiont, which are autotrophic and heterotrophic respectively. Algae prepare food for fungi and fungi provide shelter and absorb mineral nutrients and water for its partner.

Lichens are very good pollution indicators – they do not grow in polluted areas.
So, the correct answer is 'Option B- Provides protection, anchorage and absorption for the alga'.
So the correct option is B.

Read the given statements about lichens and select the incorrect ones.


(i) They represent an example of commensalism.
(ii) Algal partner obtains water and mineral salts from the fungus and the fungal partner obtains food prepared by the alga.
(iii) These do not grow in polluted areas.
(iv) The mycobiont is usually an Ascomycetes or a Basidiomycetes.
(v) The phycobiont is mostly a green alga or a cyanobacterium.
(vi) These constitute the pioneer community in the case of hydrosere.

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

  1. (i) and (ii)

  2. (v) and (vi)

  3. (i) and (vi)

  4. (i), (v) and (vi)

Show answer
Correct Option: C

Choose the correct answers from the alternatives given.
Which one of the following is an example of mutualism?

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

  1. Crown gall

  2. Lichens

  3. Hypertrophy

  4. Damping off

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Correct Option: B
Explanation:

Mutualism is a positive interaction in which both partners are benefited. Lichens are the mutualistic association of fungi and cyanobacteria in which both are benefited. 

So, the correct option is 'Lichens'.

Which one of the following is a bio-indicator of air pollution?

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

  1. Fern

  2. Lichen

  3. Money Plant

  4. Dodder

Show answer
Correct Option: B
Explanation:
Lichens can be used as bioindicators of air pollution. They obtain most of their essential nutrients from the air in the surrounding environment instead of the soil as a result of which they accumulate the pollutants present in the air on the fungal threads. Lichens are most helpful in detecting sulfur dioxide pollution but can also be used in detecting radioactive elements and other toxic compounds.

So, the correct answer is 'lichen'.