Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
10 Cards in this Set
- Front
- Back
Explain the need for larger organisms to have a transport system.
|
As an organism increases in size, the surface area to volume ratio decreases and gases are unable to diffuse enough
|
|
Explain why transpireation is an inevitable consequence of gas exchange.
|
The guard cells become turgid which opens the stoma. Gases diffuse in and out, and water is evaporated from mesophyll cells.
|
|
Explain water potential.
|
Water potential is the ability of a solution to pull water towards it by osmosis.
|
|
Describe water potential.
|
Pure water has a water potential of zero. So any solution has a negative water potential. A concentrated solution has a very negaitve water potential.
|
|
How does water pass from the soil to the root.
|
Osmosis.
|
|
Describe the mechanism of how water moves from cell to cell.
|
Either apoplast or symplast.
|
|
Differentiate between apoplast and symplast pathways.
|
Apoplast goes through the non living parts in between the cell walls and membranes. The symplast moves through the living.
|
|
What are plasmadesmata?
|
Small gaps in the cell walls of plant cells that speed up the passage of water by osmosis.
|
|
Define translocation
|
Is the movement of organic compounds around the plant through thre phloem from a source to a sink.
|
|
What are the 2 main mechanisms that xerophyrtes use.
|
Reduce the diffusion gradient, or they reduce surface area of their leaves.
|