Tag: botany

Questions Related to botany

Which of the following share same mode of nutrition?

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

  1. Rhizobium and lichens

  2. Lichens and Mycorrhizae

  3. Mycorrhizae and Rhizobium

  4. All of the above

Show answer
Correct Option: D
Explanation:
  • Rhizobium is a genus of bacteria associated with the formation of root nodules on plants. These bacteria live in symbiosis with legumes. They take in nitrogen from the atmosphere and pass it on to the plant, allowing it to grow in soil low in nitrogen.
  • A lichen is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi in a symbiotic relationship. 
  • Mycorrhizal fungi colonize the plant's root system and develop a symbiotic association called “mycorrhiza” They form a network of fine filaments that associate with plant roots and draw nutrients and water from the soil that the root system would not be able to access otherwise.
  • Lichens, Rhizobium and Mycorrhizae  have symbiotic relationships and follow same mode of nutrition.
  • So the correct answer is " All the above".

Which of the following groups of algae can be phycobiont part of lichen?

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

  1. Cyanophyceae

  2. Rhodophyceae

  3. Phaeophyceae

  4. Chlorophyceae

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Correct Option: A,D

Lichens are mutualistic relationship between:

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

  1. Fungus and photosynthetic algae

  2. Fungus and cyanobacteria

  3. Fungus and roots of higher plants

  4. Both (1) and (2)

Show answer
Correct Option: A

The fungal component of lichen is called?

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

  1. Phycobiont

  2. Photobiont

  3. Mycobiont

  4. Symbiont

Show answer
Correct Option: C
Explanation:

Lichens are the symbiotic associations i.e; mutually useful associations between algae and fungi. The algal component is known as phycobiont and the fungal component is known as mycobiont. Algae prepare food for fungi and fungi provide shelter and absorb mineral nutrients and water for its partner.  option C is the answer

Lichens are composites consisting of algae and

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

  1. Mosses

  2. Achlorophyllous organisms

  3. Bacteria

  4. Mycoplasma

Show answer
Correct Option: B
Explanation:
  • A lichen is a composite organism that emerges from algae living among the filaments (hyphae) of the fungi in a mutually beneficial symbiotic relationship.
  • Fungi are Achlorophyllous organisms because they do not perform photosynthesis due to the absence of chlorophyll.
  • Hence Lichens are composites consisting of algae and achlorophyllous organisms(fungi).
  • So, the correct answer is 'Achlorophyllous organisms'.

Lichen and mosses do not grow in :-

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

  1. $CO _2$ polluted area

  2. $NO _2$ polluted area

  3. $CO$ polluted area

  4. $SO _2$ polluted area

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Correct Option: A

A lichen having much branched system of cylindrical or ribbon-like branches but a small thallus, is called as?

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

  1. Foliose lichen

  2. Fruticose lichen

  3. Crustaceous lichen

  4. Thallose lichen

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Correct Option: A

Mycorrhiza exhibits the phenomenon of

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

  1. Commensalism

  2. Mutualism

  3. Competition

  4. Antagonism

Show answer
Correct Option: B
Explanation:

  • Mycorrhiza is the product formed by the symbiotic association between fungus and roots of higher plants, in which fungi protects the plant from pathogens and increases the surface area by which plants can absorb soil nutrients and water whereas plants provide the shelter and carbohydrates to fungi in which both get benefited.
Symbiosis includes commensalism, mutualism.

  • Mutualism, an association between two different organisms in which both get benefited.
  • Commensalism, an association in which one individual gets benefited without either benefiting or harming the other.

So, the correct answer is 'Mutualism'

In Ascolichen, algal partners is mostly member of 

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

  1. Blue Green Algae

  2. Green Algae

  3. Chlorella

  4. Both (1) and (2)

Show answer
Correct Option: D
Explanation:
Ascolichen: - Fungal partner is a member of ascomycetes. Algal partner is mostly member of green algae and rarely blue-green algae.
So, the correct option is 'Both (1) and (2)'

Which of the following is first to colonize on the rock?

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

  1. Algae

  2. Lichens

  3. Mycorrhiza

  4. Both A and C

Show answer
Correct Option: B
Explanation:

Lichen can grow on barren rock and are the first living organisms or "pioneers" to colonize places, where no other living things can survive.

Thus, the correct answer is option B.