Plant transport Flashcards
Why can simple, unicellular organisms rely on diffusion for movement of substances in and out of the cell?
The surface area to volume ratio is large, there is a lot of surface area for diffusion and not much volume to travel within.
Do multicellular organisms need a transport system? If so, why?
Yes, this is due to the SA:V ratio being low meaning it would not be able to transport the nutrients needed properly.
What is the role of phloem in transporting sucrose and amino acids between the leaves and other parts of the plant?
Phloem transports sucrose and amino acids up and down the plant.
What is the role of xylem in transporting water and mineral ions from the roots to other parts of the plant?
The Xylem transports water and mineral ions up the plant.
How is water absorbed by root hair cells?
Root hair cells absorb water from the soil by osmosis from a high water potential to a low water potential.
What is Transpiration?
Transpiration is the evaporation of water from the surface of a plant.
How is the rate of transpiration affected by changes in humidity, wind speed, temperature and light intensity?
Warmer temperatures generally lead to higher transpiration rates, while higher humidity levels decrease the rate of water loss. Additionally, windy conditions and bright sunlight also increase the rate of transpiration.
