Section 3- Plants Flashcards
Photosynthesis equation
Carbon dioxide + water –> glucose + oxygen
What does photosynthesis make?
Glucose and oxygen
How are leaves adapted for photosynthesis?
- broad so exposed to light
- chloroplasts are found in the palisade layer
- transparent upper epadermis
What are vasuclar bundles?
Xylem and phloem
Job of the vascular bundles
Deliver water and carry nutrients to parts of the lead
Take away glucose produced by photosynthesis
What is a limiting factor?
Somthing which stops photosynthesis from happening any faster
How to test a lesf for starch
- put in boiling water
- put in boiling tube with ethanol
- heat in water bath
- rinse leaf in cold water
- add iodine
Why is the leaf put in boiling water?
To stop any chemical reactions happening inside the leaf
Why is the leaf put in ethanol?
To get rid of any chlorophyll
How to show that chlorophyll is needed for photosynthesis
- variegrated leaves
- test for starch
How to show that CO2 is needed for photosynthesis?
- sealed bell jar
- soda lime
- test the leaf for starch
How to show the rate of photosynthesis
- light placed near test tube of Canadian pondweed in water
- measure the volume of gas produced with a gas syringe
What are nitrates used for in a plant?
- making amino acids and proteins
- cell growth
Magnesium uses in plants
-making chlorophyll
Magnesium deficiency
-yellow leaves
Why do unicellular organisms rely on diffusion for the movement of substances?
The substances only need to travel short distances
What is the role of the xylem?
- transports water and mineral salts
- from the roots to the shoots
What is the role of phloem?
- transporting sugars like sucrose, and amino acids
- from where they are made in the leaves to other parts of the plant
Translocation definition
The movement of food substances around the plant
Transpiration definition
The loss of water from the plant
Light intensity
Brighter light
Greater transpiration rate
Why does the rate of transpiration decrease as the light intensity decreases?
Stomata begin to close as photosynthesis doesn’t happen when it is darker
Temperature
Warmer temperature
Faster rate of transpiration
Wind speed
Higher wind speed
Greater transpiration rate
Humidity
Drier air
Faster rate of transpiration
