Transport In Plants

The diagram shows a tree trunk. A ring of bark including the phloem is removed.

The tree will eventually die because removing the bark stops the transport of

2015 Q29

• Mineral salts to the leaves.

• organic nutrients to the roots.

• oxygen to the roots.

• water to the leaves.

What is translocation? 2016 Q27

• the transport of food in the phloem tissues

• the transport of food in the xylem tissues

• the transport of water in the phloem tissues

• the transport of water in the xylem tissues

A leafy shoot was placed in a beaker containing a blue dye and then examined 5 hours later.

Which statement explains the change in appearance?

• Blue dye stains cells in the leaves.

• Blue dye moves through the xylem.

• Blue dye moves up the stem by osmosis

• Blue dye diffuses through the cells of the plant.

Tags

NGSS.MS-LS2-3

The diagram shows the internal structure of a leaf.

Which region contains cells that are responsible for the transport of manufactured food?

• A

• B

• C

• D

Tags

NGSS.MS-LS1-2

The rate of translocation in the phloem was observed to decrease steadily after a plant was placed in an environment without oxygen for several minutes. Why did this happen?

• The cells in the plants stop respiring.

• The xylem no longer takes in water for the plant.

• Active transport of mineral salts can no longer occur.

• The plant can no longer synthesize sugars to provide energy.

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-3

NGSS.HS-LS2-5

The diagram shows the arrangement of the tissues of a leaf as seen in cross-section under the microscope.

What is the arrangement of the cells in the section X-Y?

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• 
• 
• 

The table shows the rates of water absorption and transpiration of a plant during one morning.

At what time does the plant show signs of wilting?

• 9 am

• 10 am

• 11 am

• 12 am

The diagram below shows a simple potometer.

Which of the following is/are the limitation(s) of the potometer?

I It can only measure water uptake rate but not directly measure actual transpiration rate.

II The apparatus cannot be applied to large plants.

III The rate measured is slower than normal due to the absence of a root system.

• I only

• I and II only

• II and III only

• I, II and III

The graph shows the rate of oxygen production in a plant for 24 hours.

When will the guard cells be fully turgid?

• A

• B

• C

• D

Radioactive carbon dioxide is used to study the movement of materials in a plant. Thin slices are cut from the stem of the plant and placed on photographic film which become black when exposed to radioactivity. Which of the following best illustrates the results of the study?

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• 
• 
• 

Tags

NGSS.MS-LS2-3

NGSS.MS-LS1-6