Which of the following statements is incorrect for $Cycas$?

  • A
    It lacks an organized female flower.
  • B
    It has circinate vernation.
  • C
    Its xylem contains only xylem tracheids.
  • D
    Its roots contain some blue-green algae.

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What is the biological importance of the following structures in gymnosperms?
$(i)$ Mycorrhiza in roots
$(ii)$ Coralloid roots

In which of the following groups would you place a plant that produces seeds but lacks flowers and fruits?

Give scientific reasons: Cone-bearing plants possess pointed,thick-cuticled leaves.

Each plant or group of plants has some phylogenetic significance in relation to evolution. $Cycas$,one of the few living members of gymnosperms,is called the 'relic of the past'. Can you establish a phylogenetic relationship of $Cycas$ with any other group of plants that justifies the above statement?

Diploxylic or polyxylic vascular bundles are found in

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