🌲2nd Form Plants + Photosynthesis Flashcards
(19 cards)
Where does carbon dioxide come from and how does it get into the plant?
Comes from the air, diffuses into leaf via stomata
How does water get into the plant
Absorbs into the leaves
Where is glucose made
It’s made in leaves during photosynthesis
How does oxygen leave the plant?
Diffuses out to the air through stomata
How are leaves adapted for quick diffusion of carbon dioxide?
Lots of stomata, many air spaces in the spongy layer, leaves are thin
What happens if a plant loses too much water?
The plant will wilt
The plant is adapted by having ———— that can open and close to control the water vapour leaving it
Guard cells
Suggest when in a 24 hour period the stomata will be open and closed
Open: during the day time when it’s light
Closed: during the night time when it’s dark
How is the cell adapted to let water into a plant?
Has a big surface area to take in lots of nutrients and water for the plant
Cytoplasm is…
Where chemical reactions occur
The nucleus…
Contains DNA that stores information to control the cell strength
The cell wall…
Contains cellulose to give the cell strength and support
The vacuole…
Contains cell sap to provide support for the cell
The cell membrane…
Controls what goes in and out of the cell
Chloroplasts…
Contain chlorophyll to trap light and be the site of photosynthesis
What is photosynthesis?
A chemical reaction where carbon dioxide and water react to make glucose and oxygen
How to boil a leaf to test for starch (step 1,2,3,4)
Step 1 - Boil a leaf in water to soften it and kill cells
Step 2 - Boil leaf in ethanol to break down chloroplasts
Step 3 - Rinse leaf in water to remove ethanol
Step 4 - Test with iodine (any part that goes blue/black contains starch)
3 factors that affect the rate of photosynthesis
Light intensity
Amount of carbon dioxide it gets
Temperature
Fertiliser
Chemicals applied to soil to replace
