Which of the followings is/are symbiotic associations between autotrophic and heterotrophic organisms only?
(A) Mycorrhiza between fungi and roots of higher plants.
(B) Lichen between phycobiont and mycobiont.
(C) Coralloid roots of Cycas have cyanobacteria.
(D) Obligate association between Pinus roots and fungi making mycorrhizae.

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A and B only

B and C only

A, B and C only

A, B and D only

answer is D.

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Detailed Solution

Autotrophs examples are plants and cyanobacteria. A heterotroph example is fungi. Hence, the association between coralloid roots of Cycas and cyanobacteria is not considered as an association between autotroph and heterotroph as both are autotrophs.

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