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Diverrsity Of Plants
Part 1 of Paper
....s ago, trees had evolved and formed forests, within
which the diversification of vertebrates, insects, and fungi occurred. Roughly
266,000 species of plants are now living.
The two major groups of plants are the bryophytes and the vascular
plants; the latter group consists of nine divisions that have living members.
.... Part 2 of Paper
....ess
dependent on water. The oldest plant fossils date from the Silurian Period,
some 430 million years ago.
The common ancestor of plants was a green alga. The similarity of the
members of these two groups can be demonstrated by their photosynthetic pigments
(chlorophyll a and b,) carotenoids); chief storage product (starch); cellulose-
rich cell walls (in some green algae only); and cell division by means of a cell
plate (in certain green algae only).
Major Groups
As mentioned earlier, Th.... |
| Number of words: 2857 - Approximate pages: 11 |
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