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Organisms and Populations — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYOrganisms and Populations1 Mark
MCQ
Which of the following statements is incorrect?
  • A
    Lichen, an association of fungus and algae is an example of symbiosis.
  • B
    Those epiphytes which use other plants for support only and not for water or food supply are examples of commensals.
  • C
    Sea-anemone on hermit-crab is an example of protocooperation.
  • D
    Mutualism, protocooperation and commensalism cannot be included under symbiosis.
✓

Answer

  1. Mutualism, protocooperation and commensalism cannot be included under symbiosis.

Explanation:

Mutualism or symbiosis is the mutually beneficial interaction between organisms of two different species, with none of the two capable of living separately.

Mutualism and symbiosis are synonyms though symbiosis was formerly considered to be any interaction between two different organisms. Mutualism or symbiosis is generally considered to be obligatory.
Protocooperation is the non-obligatory, mutually beneficial relationship, that develops when two different organisms get associated.In commensalism, one species is benefitted without the other being harmed. All three commensalism, protocooperation, mutualism are types of symbiosis.

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