Q.

Choose the correct pair

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a

Anabaena – Coralloid roots of Cycas

b

Unbranched stem - Cedrus

c

Redwood tree - Angiosperm

d

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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Choose the correct pair