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Anabaena – Coralloid roots of Cycas

Unbranched stem - Cedrus

Redwood tree - Angiosperm

Nostoc - Pinus

answer is A.

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Detailed Solution

Cedrus is a gymnosperm with branched stem. Redwood tree is a giant gymnosperm and known as Sequoia. Pinus roots do not have Nostoc but associated with fungi to form mycorrhizae. Coralloid roots of Cycas are associated with blue green algae like Nostoc and Anabaena.

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