Hi,
I have a question

Angiosperms are considered to be the most highly evolved plants. How
are they well adapted to land?

answer how plant structures are adapted to their fuction,

and one more question

What role do plants have in maintaining biodiversity and in the
survival of humans(ecological and economical)?

thanks

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Hi,
I have a question

Angiosperms are considered to be the most highly evolved plants.

That's something of a misconception. Arguably, there's no such thing
as "most highly evolved". However, some living things have doubtless
changed more significantly than some other things have, when compared
to their last common ancestor. It makes more sense to compare related
organisms feature by feature with one another and with their common
ancestors.

How are they well adapted to land?

Not all of them are adapted to life on land.
Many are secondarily aquatic and can't live on land at all.

Do any of the terrestrial ones have adaptations to life on land
that are not found in any other vascular plants? That's possibly
a more interesting question.

answer how plant structures are adapted to their fuction, thanks

How? By evolution and natural selection.
More would require rather detailed discussions of the structures
and their functions.

and one more question

What role do plants have in maintaining biodiversity and in the
survival of humans(ecological and economical)?

Very major roles. Humans and other animals would have difficulty
surviving at all without plants or other photosynthetic organisms.

So, when is the exam due?

cheers

For the question of how angiosperms are well adapted to land, a basic
botany text usually discusses how plants are well adapted to land. Do
you want adaptations specific to angiosperms or reasons why terrestrial
angiosperms are better adapted to land than gymnosperms or seedless
vascular plants? Try a google.com search for angiosperm adaptations or
angiosperm success.

Here's one of several articles you will find,

Crepet, William L. 2000. Progress in understanding angiosperm history,
success, and relationships: Darwin's abominably "perplexing
phenomenon." Proceedings of the National Academy of Sciences 97:
12939-12941.
http://www.pnas.org/cgi/content/full/97/24/12939
http://www.pnas.org/cgi/reprint/97/24/12939.pdf

On the question, What role do plants have in maintaining biodiversity
and in the survival of humans(ecological and economical)?, try a
google.com search for plant importance, "importance of plants" or
economic botany.

David R. Hershey

wrote:
Hi,
I have a question

Angiosperms are considered to be the most highly evolved plants. How
are they well adapted to land?

answer how plant structures are adapted to their fuction,

and one more question

What role do plants have in maintaining biodiversity and in the
survival of humans(ecological and economical)?

thanks