Photosynthesis and Transpiration
17 important questions on Photosynthesis and Transpiration
How does carbon dioxide enter plants?
What type of food do plants make?
How was PSS discovered?
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What factors affect the rate of PSS?
- The light intensity- brighter the light, faster the rate
- The concentration of carbon dioxide- higher the concentration, the faster the rate.
- The temperature- warm but not too hot best temp is around 30 degrees
What is inverse square law?
A section through a leaf
There are tiny are spaces in the spongy mesophyll
There are phloem tubes close to the palisade layer
There are stomata in the lower epidermis
The leaves are thin
There are xylem vessels close to the palisade layer
The upper epidermis is transparent
Palisade cells contain many chloroplasts
To carry away the sugar made by PSS
To allow carbon dioxide and oxygen in and out of the leaf
To supply water to cells for PSS
To allow sunlight, carbon dioxide and water to reach all cells quickly.
To absorb as much sunlight as possible for PSS.
What happens if plants cannot replace the water they lose?
What factors affect the rate of transpiration?
- Temperature- higher, faster
- humidity- higher, slower
- Light- brighter, faster
- water- less, slower
How does the total surface area of all the leaves on a plant affect transpiration?
What are the adaptations of the root for absorbing water and minerals?
- branching structure, root hairs, micro villi- all increase the surface area for absorbing water.
- A good transport system (xylem vessels) these ensure that the water and minerals can be carried up the plant.
How does the water move up the stem against gravity?
Why are minerals important to plants?
Why do they need nitrates and magnesium?
Mg- chlorophyll- yellow leaves
What are Phloem tubes used for?
What are the Xylem vessels?
Soda lime/ Sodium hydroxide
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