What a Sap
Can capillary action allow a plant to be tall?
NO
What are the pigments that control a plant's photoperiodism?
Phyrochromes
What is an outside factor that affects the cell?
Hormone
What states that plants move sugars from high pressure areas to low pressure areas.
Pressure-flow hypothesis
What is a gas that causes fruit to ripen and allows trees to drop leaves in the fall?
Ethylene
Which plants require shorter nights in order to flower?
Long-day plants
Where does xylem sap flow?
Upwards only
What is thigmotropism?
When the tendrils or extensions of a plant bend around an object
What is the difference between tubers and stolons?
Tubers - underground stems that produce new plants by sending out buds
Corms - underground stems that are solid
What is the cohesion-tension theory?
As transpiration occurs in plants, water molecule in the leaf are "pulled up" by the water exiting the leaf
Explain the difference between auxins and cytokinins?
Auxins - promote cell elongation and suppress cell division in the shoot
Cytokinins - promote cell division and work with auxins to control the growth and division of the cell
What does abscisic acid do?
Slows both cell growth and cell division and causes dormancy in buds and seeds
Explain:
Why farmers want plants to reproduce asexually
How they force them to do that
Issues with isolating plants in a greenhouse
Because it allows good clones of the original plant
They force plants to grow asexually by putting them into a greenhouse
Problems include that there must be hand pollination and that some trees will only grow fruit if pollinated by a tree of the same variety
What determines a plant's photoperiodism?
The length of nights
List four ways in which plants affect their environment.
Releasing water into the air from the ground via transpiration
Absorbing nutrients from water to prevent nutrient runoff into streams and lakes
Prevents areas from overheating
Controlling erosion by holding the soil together with roots