The water pressure gradient in phloem tubes is formed by the
A) leaves being higher than the roots, which means that gravity creates pressure.
B) diffusion of water from one sieve-tube cell to the next.
C) loading of sugars into phloem at sources and removal of sugars at sinks.
D) active transport of water from sugar sources to sugar sinks.
Correct Answer:
Verified
Q4: Generally speaking, fluids in plants are
A) pushed
Q5: A hot, dry summer will reduce crop
Q6: If a plant is kept in the
Q7: Where do plants get most of their
Q8: _ increase the surface area of roots.
A)
Q10: What force is responsible for the cohesiveness
Q11: _ pulls water through a plant.
A) Transpiration
B)
Q12: The pores that facilitate gas exchange in
Q13: Aphids are small insects that insert their
Q14: The loss of water from the leaves
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