Explain what is meant by source to sink flow in phloem transport.
Explain why it is necessary for phloem to be alive to be functional,whereas xylem can function as dead tissue:
Name three environmental conditions that increases the rate of transpiration in plants,explaining how they operate:
A light air craft takes off flying die north then turns and flies 11 000 metres due west.The plane then has a bearing of 340 degrees from its starting point.For what distance did it fly due north?
The system H2 (g) + 3N2 (g) = NH3 (s) is at equilibrium.Use Le Chatelier's principle to predict the direction in which the equilibrium will shift if the ammonia is withdrawn from the reaction chamber.
If the temperature of the system PCl5 (g) =PCl3 (s) + Cl2 (g) + 92.5 kj. is increased, predict the direction of th Le Chatelier's shift.
The volume occupied by the reaction SiF4(g)+2H2O (g)=SiO2 (s)+4HF (g). is reduced.Predict the direction of shift in the position of equilibrium.Will the shift be in the direction of the more gaseous molecules,or fewer?
Describe two differences between xylem and phloem.
What happens if water is lost from the leaves faster that it is taken up the roots?
Does all the water which rises up a plant escape through the leaves?
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