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Exchange Surface and Diffusion
Mineral ions enter the plant by active transport through the roots.

Exchange Surface and Diffusion

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Getting essential materials to where they are needed in an organism requires specialized tissues and organs. In animals, the transport is taken care of by blood. In plants it is the sap, which is a mixture of water and nutrients. But when the materials arrive at the place they are required, how do they move out of the blood or the sap? The answer is by diffusion through exchange surfaces.

1.
During gaseous exchange, which two gasses are involved?
Oxygen and hydrogen
Nitrogen and oxygen
Carbon dioxide and oxygen
Ammonia and oxygen
Oxygen is taken in and carbon dioxide is given out. Plants do the opposite during photosynthesis.
2.
Alveoli are found in the...
gills
lungs
liver
brain
They are also known as air sacs
3.
In animals, uptake of materials is quicker if there is a rich network of...
capillaries
villi
lungs
arteries
Lungs, gills and the villi all have a dense capillary network which takes up the materials quickly, thus maintaining a steep concentration gradient for maximal uptake
4.
Within leaves, the gasses enter and leave through specialized pores called...
stomata
stoma
holes
gaps
These are found on the underside of the leaves
5.
Mineral ions enter the plant by active transport through the...
stem
leaves
roots
flowers
Mineral ions, such as nitrate ions, enter the plant through specialized cells in the roots called root hair cells. These have a lot of mitochondria to supply the energy required for the active transport of the mineral ions
6.
These are found in large numbers in the lining of the small intestine.
Alveoli
Ville
Villi
Arteries
These create a very large surface area within the small intestine
7.
Carbon dioxide enters plants mainly through the...
roots
leaves
flowers
stem
Leaves are thin and flat which helps to make gaseous exchange more efficient.
8.
Exchange surfaces are generally involved in the...
transfer of materials across a membrane
removal of waste
uptake of nutrients
respiration
This happens where there is a difference in concentration (a concentration gradient) of the materials being exchanged on the two sides of the membrane
9.
Diffusion is faster across an exchange surface if the concentration gradient is...
less
increased
the same
moved
Think of it like a hill. If a hill is steeper (has a greater gradient), an object will roll down it better
10.
Exchange surfaces are usually very...
thin
thick
wide
tall
If the structure is thin, materials get through more quickly
Author:  Donna Maria Davidson

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