Tag: lichens ( the nature's pioneers )

Questions Related to lichens ( the nature's pioneers )

Phenomenon of halotism or controlled parasitism is shown by _______

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

  1. Leguminous roots

  2. Lichens

  3. Mycorrhiza

  4. All of the above

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Correct Option: B

Phycobiont and mycobiont together constitute :

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

  1. Phycomycetes

  2. Lichens

  3. Phycobilins

  4. Mycorrhiza

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Correct Option: B
Explanation:
Lichens are symbiotic association between alga and fungi. Phycobiont is algal partner and mycobiont is fungal partner. 
So, the correct answer is 'Lichens'

Lichens are composite organisms containing an alga and

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

  1. Fungus

  2. Bacterium

  3. Moss

  4. Protozoan

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Correct Option: A
Explanation:

Lichens are composite organisms containing algae and fungus. They live in symbiotic association. In this, algae provides food and nutrition obtained by photosynthesis. In turn, fungus provides protection, anchorage and absorption of water and nutrition from soil for algae.

Thus, the correct answer is option A.

Pick up the wrong statement.

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

  1. Lichens are symbiotic associations.

  2. Lichens do not grow in unpolluted areas.

  3. Lichens are very good pollution indicators.

  4. Algal component of lichen is known as phycobiont .

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Correct Option: B
Explanation:

  • Lichens are widely used as environmental indicators or bio-indicators. If the air is clean, shrubby, hairy and leafy, the lichens become abundant. 
  • Only a few lichen species can tolerate quite high levels of pollution.

So the correct option is B.

Lichens growing on rocks are called _______

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

  1. Saxicolous

  2. Corticolous

  3. Lignocolous

  4. Terricolous

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Correct Option: A

In lichen, the fungus provides

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

  1. Protection, anchorage and absorption for alga

  2. Food for alga

  3. Oxygen for alga

  4. Fixes nitrogen for alga

Show answer
Correct Option: A
Explanation:

Lichen is a symbiotic association between blue-green algae and fungus. In this, blue-green algae provide food and nutrition obtained by photosynthesis. In turn, fungus provides protection, anchorage and absorption of water and nutrition from soil for algae.

Thus, the correct answer is option A.

The most common photobiont from green algae in lichen thallus is :

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

  1. Trebouxia

  2. Tetraspora

  3. Chlamydomonas

  4. Ulothrix

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Correct Option: A
Explanation:

The majority of lichen photobionts belong to the green algal class Chlorophyceae, with the most common genera being Trebouxia.

So the correct option is A.

The two micro-organisms which live in symbiotic association in lichens are

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

  1. Fungus and protozoa

  2. Alga and bacteria

  3. Bacteria and protozoa

  4. Alga and fungus

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Correct Option: D
Explanation:

A lichen is a composite organism consisting of a fungus (the mycobiont) and a photosynthetic partner (the photobiont) growing together in a symbiotic relationship. 

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'.