Q4a-Transport Flashcards
Why must a plant open its stomata even though that means losing large amounts of water?
To allow carbon dioxide to enter the leaf for photosynthesis
How much water can a mature tree use on a average growing season day?
50-100 gallons (189-378L) or more
The water potential of water vapor (gas) is ___ than that of liquid water…
Lower
When water evaporates (transpires) through open stomata, it causes…
Tension that pulls water from further within the plant
How do plants control the amount of water they lose on a given day?
By opening and closing stomata as needed (stimulated by darkness, light, CO2-levels, hydration levels, & Temperature, etc.).
What causes the tendency of water from a reasonably moist soil to enter plants?
Osmosis
Root uptake of essential nutrients and water is enhanced in most plant species by…
symbiotic ‘mycorrhizal’ fungi living in or on the roots
The main type of ‘food’ found in the phloem sap is…
Disaccharide sucrose
Movement of the sap through a plant’s phloem is driven by…
pressure caused by high concentrations of sugars, etc. (osmotic pressure) in the sieve tube members
‘Sinks’ for phloem contents include
both metabolically active areas and food-requesting storage organs.
