2ne1

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Oct 27, 2009
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which of following has sporophyte that is 'independent' of gametophyte, and gametophye is 'independent' of sporophyte?

a)dandelion
b)fern
c)oak
d) moss
 

Brettla16

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Sep 27, 2009
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This is the evolutionary trend of terrestrial plants.

Seedless non-vascular plants have a large gametophyte stage, with a small dependent sporophyte. ------->Seedless vascular plants have a large sporophyte stage, with a smaller independent gametophyte. -------->Seed plants have an even more reduced gametophyte stage, that is completely dependent on the very large sporophyte stage.

a. Dandelion is a seed plant (angiosperm), so its gametophyte is dependent on the sporophyte.

c. Oak is a seed plant (gymnosperm), so its gametophyte is dependent on the sporophyte.

d. A moss is a seedless non-vascular plant (bryophyte), so its sporophyte is dependent on the gametophyte.

Answer is B. Ferns are seedless vascular plants (Pterophyte), and are known for their free-living, photosynthetic, independent gametophytes.