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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