Tag: lichens ( the nature's pioneers )

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

Phenomenon of halotism or controlled parasitism is shown by _______

  1. Leguminous roots

  2. Lichens

  3. Mycorrhiza

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

The term helotism refers to a master-slave relationship in symbiosis, where the fungus is often considered to dominate or 'enslave' the algal partner, a concept frequently applied to the lichen association.

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

Lichens are composite organisms containing an alga and

  1. Fungus

  2. Bacterium

  3. Moss

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

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

Pick up the wrong statement.

  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 .
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

In lichen, the fungus provides

  1. Protection, anchorage and absorption for alga

  2. Food for alga

  3. Oxygen for alga

  4. Fixes nitrogen for alga
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. Fungus and protozoa

  2. Alga and bacteria

  3. Bacteria and protozoa

  4. Alga and fungus
Reveal answer Fill a bubble to check yourself
D Correct answer
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. 

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

Choose the correct answers from the alternatives given.
Lichens :

  1. cannot reproduce

  2. need a nitrogen source to live

  3. are parasitic on trees

  4. are able to live in extreme environments
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.