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  • In which of the following groups of gymnosperms, vessels are present in the xylem? Option: 1  Coniferopsida <div class='

In which of the following groups of gymnosperms, vessels are present in the xylem? 

Option: 1

 Coniferopsida 


Option: 2

 Ginkgopsida 


Option: 3

 Gnetopsida 


Option: 4

 Cycadopsida


Answers (1)

best_answer

 

 

Classification of Gymnosperms -

Gymnosperms are divided into four groups:

1-Cycadopsida- Wood is manoxylic, Siphonogamous fertilization, male gametes are winged, they are commonly called cycads. E.g Cycas 
 
2-Coniferopsida- commonly called conifers, e.g. Pinus. Wood is pycnoxylic, small ephemeral cones formed in groups, large and perennial female cones, siphonogamous fertilization, male gametes non-motile. 
 
3-Ginkgopsida- represented by Ginkgo, also known as maidenhair tree. It is known as a living fossil. It is the only one living organism in this group, it has leathery and fan-shaped leaves, The veins are dichotomously branched, male gametes are motile and multiflagellate.
 
4-Gnetopsida- includes Gnetum, Ephedra, Welwitschia. Vessels are present in secondary xylem, orthotropous ovules with long tubular micropyle are present,  resin canals absent.
 

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Gnetopsida- includes Gnetum, Ephedra, Welwitschia.Vessels are present in secondary xylem, orthotropous ovules with long tubular micropyle is present,  resin canals absent.
 

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