CH9 transport in plants test questions Flashcards
How are nutrients transported around the plant?
Phloem
What is an example of a sink in a plant?
Meristem
What is the purpose of the Casparian Strip
To force water from the cell wall into the cytoplasm
What is an example of something that contributes to the movement of water up the stem of a plant
Root pressure
In an experiment on translocation, swelling ocurred above the ring used to hold the stem in place - what substance caused this swelling?
Sucrose
How do plants control water loss from leaves?
Close the stomata
What are the steps of the transpiration stream?
- Water evaporates from mesophyll into air space in leaf (Water has to leave for water to come in)
- Water moves down a concentration gradient out of the leaf
- Water potential of cell is lowered and watermoves into it via osmosis
- Water moves out of the xylem via osmosis
How does water move from the root to the xylem?
Down a water potential gradient.
What is an adaptation of pine trees to reduce water loss?
Narrow leaves with a thick waxy coating - pines
What is a plant adapted to live in standing water called?
Hydrophyte
What is the part of a plant used to transport sucrose called?
Phloem
What is the pathway of water that moves through the cell wall and not the cytoplasm called?
Apoplast pathway
What is a plant that possesses transport tissues called?
vascular plant
What is an apparatus to measure water uptake in a plant called?
Potometer
What is the difference between transpiration and translocation?
- Transpiration is the movement of water from the root to the stomata on the leaf, via the xylem, using cohesion-tension theory.
- Translocation is the movement of assimilates (dissolved sucrose/amino acids) from the source to the sink (e.g. sucrose from leaf to the root), along a concentration gradient.