Transport in Plants Flashcards
Define Osmosis?
Net Movement of molecules from a high water concentration to a low water concentration across a semi-permeable membrane
How do plants get water?
Through Root Hair Cells
Give the adaptations of root hair cells (RHC)?
Large SA
High amount of mitochondria
Don’t Contain Chloroplasts
What two processes take place for RHC to absorb water and minerals?
Osmosis
Active Transport
What tube in the plant takes water up to the leaves and rest of the plant?
The Xylem
What does the Xylem do?
Transports water and minerals to the rest of the plant as well as providing physical support
What reactions take place in the leaf which requires water?
Photosynthesis
Define transpiration?
The evaporation of water from the leaves of the plants
How can transpiration be sped up?
Through heat, wind or humidity
What molecule is stored and used in leaves?
Glucose
What vessel moves minerals and sugars to the RHC?
Phloem
Name all 7 parts of a leaf cell?
Waxy Cuticle
Upper epidermis
Palisade Mesophyll
Spongy Mesophyll
Stomata
Guard Cell
Lower Epidermis
Which part of the leaf is responsible for water loss?
Stomata
What occurs through the stomata?
Gas Exchange
What helps the stomata open and close?
Guard cells
When do guard cells open the stomata?
When they are turgid
When do the stomata open and why?
In the day, because there is a high amount of photosynthesis occurring meaning O2 and H2O have to be exchanged
When do the guard cells close the stomata?
When they are flaccid
When do the stomata close and why?
In the night as there is no photosynthesis occurring or when too much water is lost
What can be used to measure rate of transpiration?
A Potometer
Give all 6 steps of setting up a potometer?
- Cut stem diagonally UNDERWATER
- Check for air leaks
- Record where air bubble starts
- Record where air bubble finishes after a given time
- Repeat experiment
- Calc Volume of water loss: millimetres (length) /time)
