How does water get to the top of a tree?

Question 1 of 6

1

What do xylem vessels transport?

Select one of the following:

Minerals
Water
The products of photosynthesis

Explanation

Question 2 of 6

9

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Leaves have , which open to let in for photosynthesis. This, unavoidably, lets water diffuse out of the leaf due to the surrounding air usually having a than inside the leaf. This process is called which defines as the evaporation of water vapour, mainly through the stomata in the surface of a leaf. It is a process, using energy from the sun, which evaporates water from the cells.
As water vapour diffuses from the air spaces in the mesophyll and through the stomata, it is replaced by water from the cells. This in turn is replaced by water from the in the veins of the leaf.

Explanation

Question 3 of 6

10

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Water cannot be pulled up more than ( 10, 5, 20 )m, which is a problem tall trees must be overcome. Xylem vessels are very narrow, and water molecules tend to stick together because of the ( hydrogen, covalent, strong ) bonds between them - this property of water is called ( cohesion, tension ). As water moves out of the ( xylem, phloem ) in a leaf, it drags other molecules of water behind it. Because the vessels are so ( narrow, wide ), the column of water behind does not break, and water is pulled up all the way from the roots.
The pulling force is so great that the column of water is actually being ( stretched, pulled ) - it is under ( tension, cohesion ). The tension in the column of water tends to pull the walls of the vessels ( inwards, outwards ) slightly. However, the ( lignin, cellulose ) in the walls is strong enough to stop the vessels ( collapsing, bursting, breaking ).

Explanation

Question 4 of 6

5

Water enters the roots by ❌ and passes up the stem to the leaves, where it evaporates into the ❌ inside the leaf and then passes out to the atmosphere through the ❌. The air has a low ❌ because it normally has a low percentage of ❌.

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osmosis

diffusion

transpiration

air spaces

cells

stomata

mesophyll

water potential

concentration

water vapour

water molecules

Explanation

Question 5 of 6

2

Which of these are advantages of transpiration

Select one or more of the following:

The stream of water transports mineral ions around the plant
The flow of water helps to cool down the plant.
The evaporation of water from the leaves has a cooling effect which prevents enzymes denaturing.
The evaporation of water has a cooling effect which gives the plant energy.

Explanation

Question 6 of 6

1

The two ideas, of cohesion and tension, used to explain how water is pulled up in a plant, are brought together by what theory?

Select one of the following:

Cohesion-tension theory
Tension-cohesion theory
Cohesion theory

	Created by Lucy Garland about 8 years ago

AS - Level Biology (Mass Transport in Plants) Quiz on How does water get to the top of a tree?, created by Lucy Garland on 09/04/2016.

How does water get to the top of a tree?

Question 1 of 6

What do xylem vessels transport?

Select one of the following:

Explanation

Question 2 of 6

Fill the blank spaces to complete the text.

Explanation

Question 3 of 6

Select from the dropdown lists to complete the text.

Explanation

Question 4 of 6

Water enters the roots by ❌ and passes up the stem to the leaves, where it evaporates into the ❌ inside the leaf and then passes out to the atmosphere through the ❌. The air has a low ❌ because it normally has a low percentage of ❌.

Drag and drop to complete the text.

Explanation

Question 5 of 6

Which of these are advantages of transpiration

Select one or more of the following:

Explanation

Question 6 of 6

The two ideas, of cohesion and tension, used to explain how water is pulled up in a plant, are brought together by what theory?

Select one of the following:

Explanation