Question 1

The haustorium is a modified root that penetrates into the xylem and/or phloem of another plant.With this information,one can deduce that haustorium are roots of

Accepted Answer

Parasitic plants attach to a host plant to steal from the host.

Question 2

The cohesion-tension theory explains how water moves within a plant.

Accepted Answer

Cohesion-tension explains movement of water in the xylem.

Question 3

Scientists measured the pressure in the xylem of redwood trees at different heights and found that the higher they made their measurements,the lower the pressure.They extrapolated this to a pressure of zero,and concluded that the tallest a tree could grow is 122-130 meters.The tallest known tree on Earth is 112.7 meters.Which of the following most likely limits the height of trees?

Accepted Answer

At a certain length of water column, no further height can be added without snapping the column and emptying xylem.

Question 4

Bean plants significantly change the development of their roots when they make nodules,as well as diverting energy and resources for this change.Given the critical role of normal roots,why would the plant make this change?

Accepted Answer

Nodules provide so much critically needed nitrogen that the sacrifices needed to make the nodules are worthwhile to the plant.

Question 5

Many carnivorous plants use modified leaves to trap their prey.

Accepted Answer

Most carnivorous plants have modified leaves, though the modifications range from snap traps to sticky leaves.

Quiz 21: Plant Form and Function

The haustorium is a modified root that penetrates into the xylem and/or phloem of another plant.With this information,one can deduce that haustorium are roots of

The cohesion-tension theory explains how water moves within a plant.

Bean plants significantly change the development of their roots when they make nodules,as well as diverting energy and resources for this change.Given the critical role of normal roots,why would the plant make this change?

Many carnivorous plants use modified leaves to trap their prey.