Plant tissues Flashcards
What are the organs in plants?
Leaves
Stems
Roots
What are the tissues in plants and what do they do?
Xylem: Tubes that transport water and minerals
Phloem: Tubes that transport sugars and other nutrients
What is a vascular bundle?
Where plant vessels (Xylem + phloem) are grouped together within the plant stem to form a vascular bundle
What is transpiration?
transpiration is the process in which water is lost as water vapor via the plants stomata.
What factors affect the rate of transpiration?
Light intensity (increases)
temperature (increases)
wind (increases)
humidity (decreases)
What do guard cells do?
Regulate the stomata opening size
What is the stomata?
Ø Stomata regulates water loss and gas exchange with the environment.
What is the stomata open and closed?
Ø When guard cells are turgid (water enters the cell) the stomata opens
Ø When guard cells are flaccid (water leaves the cell) the stomate closes
What is adhesion?
- Water sticks to non-water molecules
-water is attracted to the walls of the xylem and the water is slowly pulled upwards/curved
What is cohesion?
-cohesion occurs when water molecules are attracted to each other
-when some water molecules move up the xylem, they pull others along with them.
