9.1 Transport in the Xylem of Plants

Certain plants have developed a mutualistic relationship with soil fungi, in which the plant provides sugars to the fungus for respiration.

In what way does the plant receive a benefit in return?

Which table gives the most accurate summary of the movement of water via the apoplast and symplast pathways?

The following data were gathered from an experiment into the rate of transpiration in samples of plants in the genus Coelus, commonly grown by gardeners for herbaceous borders. Coelus grows easily in UK gardens and thrives in the relatively high rainfall that the UK experiences.

Marram grass is a xerophyte that is found on sand dunes and other fast-draining soils in coastal areas. The same experimental set-up was repeated with marram grass. 

Which graph of A - D would be the most likely graph for a comparable experiment carried out on marram grass?

The diagram shows a potometer set up to measure the rate of transpiration in a piece of cut plant. 

For a potometer with a cylindrical capillary of the internal diameter of d mm, the bubble was measured to travel h mm in an experimental time of s seconds. 

Which is the correct formula to calculate the rate of transpiration (as a volume of water uptake per unit time) in this experiment?