B2.3 - Photosynthesis Flashcards
In the leaf, what is the function of the epidermal tissues?
In the leaf, the function of the epidermal tissue is to cover the plant.
In the leaf, what is the function of the mesophyll?
In the leaf, the function of the mesophyll tissue where most of the photosynthesis occurs.
In the plant, what is the function of the phloem?
In the plant, the function of the phloem is to transport dissolved sugars from the leaves to other parts.
In the plant, what is the function of the xylem?
In the plant, the function of the xylem is to transport water and minerals from the roots to the leaves.
What is the equation for photosynthesis?
Carbon dioxide + water —— > (light energy) glucose + oxygen
During photosynthesis, which molecule absorbs light energy?
During photosynthesis, light energy is absorbed by chlorophyll.
Where is the plant cell do we find chlorophyll, which absorbs light energy?
In the plant cell, we find chlorophyll in the chloroplasts.
Where does the carbon dioxide used in photosynthesis come from?
The carbon dioxide used in photosynthesis comes from the air.
Where does the water used in photosynthesis come from?
The water used in photosynthesis comes from the soil.
How do plants use glucose for respiration?
Plants respire which releases energy which enables them to convert the rest of the glucose into other useful substances.
How do plant use glucose to make cell walls?
The glucose is converted into cellulose for making strong cell walls.
How do plants use glucose to make proteins?
The glucose is combined with nitrate ions to make amino acids, which are then made into proteins.
How do plants store glucose as seeds?
The glucose is converted into lipids for storing in seeds.
How do plants store glucose as starch?
The glucose is turned into starch and stored in roots, stems and leaves ready for use in periods where photosynthesis does not occur (winter).
Which ion absorbed from the soil, is needed by plants to make proteins?
Nitrate ions
Why is starch a good option to store glucose as?
Starch is insoluble as a cell with lots of glucose would draw in loads of water and swell up.
What are the limiting factors of photosynthesis?
Light intensity
Temperature
Carbon dioxide concentration
State why oil burners and artificial lights are often used in greenhouses.
The rate of photosynthesis is limited by light (which is provided by artificial lights) and carbon dioxide and low temperature. Oil burners release carbon dioxide and heat.
Why do plants need magnesium ions for healthy growth?
Magnesium ions produce chlorophyll, which is the substance used in photosynthesis to trap light energy, which leads to the production of glucose which is used by the plant for respiration and protein production.
Name one ion that plants take in to supply them with nitrogen.
Nitrate ions
