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HACTEHA [7]
3 years ago
5

According to the pressure-flow hypothesis, what mechanism causes the movement of phloem sap from sources to sink tissues? See Se

ction 35.4 (Page) .
A) Transpirational pull from the leaves
B) Solute potential differences between source and sink
C) Root pressure
D) Pressure potential differences between source and sink
Biology
1 answer:
Vaselesa [24]3 years ago
3 0

Answer:

D) Pressure potential differences between source and sink

Explanation:

high turgor pressure causes the movement of   phloem sap from source to sink, Sap moves through phloem via translocation, the transport of dissolved materials in a plant. Unlike the xylem, which can only carry water upward, phloem carries sap upward and downward, from sugar sources to sugar sinks.

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7 0
3 years ago
Read 2 more answers
1. What percentage of puppies would have the same genotype as the<br> parents, Ww?
wolverine [178]

Answer:

50%

Explanation:

This question involves a single gene with two alleles W and w in puppies. According to the question, the genotype of the parent organisms are Ww. In a cross between the two parents i.e. Ww × Ww, the following gametes will be produced by each parent: W and w.

Using these gametes in a punnet square (see attached image), the following genotype of offsprings will be produced: WW, Ww, Ww, ww. Hence, based on this question, the percentage of puppies that would have the same genotype as the parents, Ww are 1/2 × 100% = 50%.

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