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Which one of the following statements about Cycas is incorrect?

1. It does not have a well-organized female flower
2. It has circinate vernation
3. Its xylem is mainly composed of xylem vessels
4. Its roots contain some blue-green algae

Correct answer: Its xylem is mainly composed of xylem vessels

Solution

Cycas is a gymnosperm, so its xylem is mainly made of tracheids, not xylem vessels. The other statements are true: it lacks a well-organized female flower, shows circinate vernation, and has cyanobacteria in coralloid roots.

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