SCIENCE
PLANT KINGDOM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Pteridophyte gametophyte has a protonemal and leafy stage
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In gymnosperms female fametophte is free-lliving
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Antheridiophores and archegoniophores are present i pteridophytes
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Origin of seed habit can be traced in pteridophytes
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Detailed explanation-1: -The development of the zygote into the young embryo takes place within the female gametophyte. This event is a precursor to the seed habit and hence the origin of the seed habit is said to be in pteridophytes. Hence Option D is the correct statement.
Detailed explanation-2: -The origin and evolution of seed habitation started to occur in the late Devonian period, about 385 million years ago. It began with the evolution of the first modern tree, Archaeopteris species which produced an advanced system of spores called heterospory.
Detailed explanation-3: -In gymnosperms, female gametophyte is free-living. Antheridiophores and archegoniophores are present in pteridophytes. The origin of seed habit can be traced in pterido-phytes. Pteridophyte gametophyte has a protonemal and leafy stage.
Detailed explanation-4: -Plants belonging to division Pteridophyta are vascular cryptogams.
Detailed explanation-5: -Many scientists believe that pteridophytes have originated from algae, though they are not unanimous about the type of ancestral algae. The concept of the algal origin of pteridophytes is based on the similarity between algae (specially chloro-phyceae) and pteridophytes.