During transpiration plants move water from the roots to their leaves for photosynthesis in xylem vessels. Glucose made in photosynthesis is then moved to all cells in phloem vessels for respiration.
What substances are transported in the xylem?
Water and mineral ions
Sugars and amino acids
What feature of palisade cells makes them efficient at photosynthesis?
They have a thick, waxy coating
They are packed with chloroplasts
They are very close to most of the stomata
In which direction are substances transported in the phloem?
Upwards and downwards
What is the process that transports sustances in the phloem?
How is the rate of water uptake by a plant measured?
By the increase in mass of plant leaves
Counting the number of stomata on a leaf
Using a potometer
What type of cells release the energy required for phloem transport?
How does water enter a root hair cell?
By active transport
Why do Christmas tree growers spray the trees with a chemical that blocks the trees' stomata?
To increase the rate of photosynthesis
To reduce the transpiration rate so thay they lose less water
To make them look attractive for Christmas
Why do multicellular organisms need a transport system?
To increase the surface area to volume ratio of their bodies
To move molecules internally when the rate of diffusion would be too slow
To provide additional exchange surfaces
Why does the rate of transpiration increase as the light intensity is increased?
The plant is respiring more so will require less carbon dioxide
The plant will need to get rid of excess water
The plant opens its stomata to allow the entry of carbon dioxide for photosynthesis