Question

The volume of phloem tissue in a stem is typically much smaller than the volume of xylem tissue because of which of the following?

		xylem dies quickly and, therefore, needs to be replaced frequently
		phloem conduits are much wider, and because flow is proportional to conduit radius raised to the fourth power, fewer phloem conduits are needed
		the pressure gradient driving water flow in the phloem is metabolically generated and, therefore, can be much larger than the environmentally generated xylem gradient.
		plants lose hundreds of H2O molecules for each CO2 gained

Answer 1

Ang flow is proportional to the readers of the Conduit vraised to the fowith power, Pholem conduits are much widey and because How is proportion to conduit radeus to fourth Power, fewer conduit needed. while xylem conduits are required more So b correct. - dies quickly A incorrect, xylem does not Cand o also incorrect, Scanned with CamScanner