Which are the main water-conducting tubes in angiosperms?
1.Phloem vessels
2.Xylem vessels
3.Trachaeids
4.Sieve tubes
2
You might also like to view...
A cuticle
a. resists water loss. b. covers epidermal cells. c. may contain waxes and cutin. d. resists attack by microorganisms. e. does all of these.
The situation in which an active regulatory protein "turns on" gene expression is an example of
A) feedback inhibition. B) positive control. C) negative control. D) constitutive gene elements. E) a mutation.
Explain how the nervous system and hormones regulate the secretion of gastric juice. What will be an ideal response?
When sunlight hits chlorophyll, the electrons are excited out of the chlorophyll; the electrons go ________ an energy hill, and as they pass through the electron transport chain they go ________ an energy hill
Fill in the blank(s) with correct word