Question 1

Based on the diagram, what is the primary function of the phloem in the beet plant?

Accepted Answer

Transporting sugars from source cells in the leaves to sink cells in the root

Question 2

According to the image, what causes the movement of sugars from the source (leaf) to the sink (root) in the phloem?

Accepted Answer

A difference in sugar concentration and water pressure between source and sink cells

Question 3

If the sugar concentration in the root (sink) cells increased to match that of the leaf (source) cells, what would most likely happen to the flow of sugars in the phloem?

Accepted Answer

The flow of sugars would stop because there would be no concentration gradient

Question 4

Which of the following best describes the role of the root in the process shown in the diagram?

Accepted Answer

The root acts as a sugar sink, storing sugars transported from the leaves

Question 5

Which process is responsible for the movement of water from the xylem into the phloem at the source cell?

Accepted Answer

Osmosis due to high sugar concentration in the source cell

Question 6

What would happen to the pressure in the phloem at the source if the plant stopped photosynthesizing?

Accepted Answer

Pressure would decrease due to reduced sugar production

Question 7

Which equation best represents the relationship between water potential ($$\Psi$$), solute potential ($$\Psi_s$$), and pressure potential ($$\Psi_p) in $$the phloem?

Accepted Answer

$$\Psi = \Psi_s + \Psi_p$$

Question 8

If a beet plant's root is damaged and cannot store sugars, what is the most likely immediate effect on the phloem transport system?

Accepted Answer

Sugars will accumulate in the leaves, reducing the concentration gradient

Question 9

Which of the following best explains why the root acts as a 'sink' in the context of the diagram?

Accepted Answer

It stores sugars transported from the leaves

Question 10

In the context of the diagram, which process is most directly responsible for the movement of sugars from the phloem into the root cells?

Accepted Answer

Active transport

Midterm Study Guide: Evolution, Plant Structure, and Diversity

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