Tag: lichens ( the nature's pioneers )

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

Fungal partner of a lichen is commonly 

  1. Ascomycetes

  2. Basidiomycetes

  3. Phycomycetes

  4. Deuteromycetes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Lichens are stable, self-supporting associations between fungi and photobionts. 
  • The fungi are most commonly ascomycota. A few holobasidiomycetes are known to form the association. 
  • The photobionts are either algae or cyanobacteria. The algae may be single celled or rarely filamentous. Option A is correct
Multiple choice botany adaptations to different ecosystems lichen lichens lichens ( the nature's pioneers )

Lichens have an actual relationship of 

  1. Parasitism

  2. Mutualism

  3. Helotism

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

In lichens, a relationship occurs in which the fungus lives as a dominant organism and algae like a slave, the relationship is known as helotism. It is a form of symbiosis in which one species is forced to perform tasks for another, for their mutual benefit. 

Thus, the correct answer is option C.

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

Lichens show symbiotic relationships between

  1. Fungus and roots of higher plants

  2. Fungus and alga

  3. Two algae

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

A lichen is a composite organism that arises from algae or cyanobacteria (or both) living among filaments of a fungus in a symbiotic relationship. The combined life form has properties that are very different from the properties of its component organisms. The fungus benefits from the symbiotic relation because algae or cyanobacteria produce food by photosynthesis. The algae or cyanobacteria benefit by being protected from the environment by the filaments of the fungus, which also gather moisture and nutrients from the environment, and (usually) provide an anchor to it. 

Thus, the correct answer is option B.

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

Which of the following statement is wrong about lichens?

  1. Some species are eaten by Reindeers.

  2. Lichens are indicators of pollution.

  3. They grow rapidly about 2 cm per day.

  4. They have symbiotic relationship between alga and fungus.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Lichens are known for their extremely slow growth rates, often growing only a few millimeters per year, not 2 cm per day.

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

Lichens multiply by 

  1. Conidia

  2. Oidia

  3. Ascopores

  4. Soredia
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Lichens reproduce vegetatively by soredia formation. It is the most common form of reproduction where small protuberances are formed on the thallus. They may have a definite pustule or appear as greyish dust. Many lichens reproduce asexually, either by vegetative reproduction or through dispersal of diaspores, which contain a few algal cells surrounded by fungal cells. 

Thus, the correct answer is option D.

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

In majority of lichens, there is association of ___________.

  1. Green algae and ascomycetes

  2. Green algae and basidiomycetes

  3. Blue-green algae and ascomycetes

  4. Blue-green algae and basidiomycetes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Lichens are symbiotic organisms consisting of a fungal partner (mycobiont) and an algal or cyanobacterial partner (phycobiont). In the vast majority of lichens, the fungal partner is an ascomycete, and the photosynthetic partner is either green algae or blue-green algae (cyanobacteria).

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

In lichens, sexual reproduction is usually performed by

  1. Algal partner only

  2. Fungal partner only

  3. Both algal and fungal partner only

  4. Either of the two partners
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Lichens exhibit the symbiotic association between algae and fungi. In this plant, algae is the photosynthetic partner involved in food preparation and the fungal partner increases the surface area for the absorption of water and minerals. Also, the fungal partner is involved in sexual reproduction with the help of reproductive structures called apothecia. 

Thus, the correct answer is option B. 

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

Lichen with a branched system but small base is :

  1. Fruticose

  2. Foliose

  3. Crustose

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

Lichens with a branched system but small base are Fruticose.


Lichens are a complex life form of a symbiotic partnership of two separate organisms, a fungus, and algae. The dominant among then is a fungus. The algae can be either green algae or cyanobacteria or both fungus. 

These are $3$ main types of lichens. Foliose, Fructose, and Crustose. Foliose lichens have $2$ easily distinguishable sides, top, and bottom. Fruticose lichens have round branches that have a central core and others are hollow in the middle.