Topic 7 - January Yr12 Flashcards
How to measure Light?
Light meter
How to measure Temperature?
Thermometer
How to measure wind speed?
Anemometer
How to measure pH?
pH meter
What 3 ways can substances move in and out of cells?
Diffusion
Active Uptake
Osmosis
What is Osmosis?
The movement of water molecules from a dilute solution to a more concentrated solution through a selectively permeable membrane
What happens if cells lose too much water?
They become plasmolysed and shrivel up
What happens if cells get too much water?
They swell and burst
What happens when Plant Cells lose water?
They become plasmolysed and lose their turgor, becoming flaccid
What 4 reasons make water very important for plants?
Support
Transport
Transpiration
Photosynthesis
What is transpiration?
Evaporation of water from spongy mesophyll followed by diffusion through air spaces and stomata
What is the Transpiration stream?
The continuous movement of water in to, through and out of the plant
How to measure speed of water uptake with Bubble Potometer?
Record initial position of bubble
After a certain period of time, record final position of bubble
Calculate distance moved by bubble per minute
What 4 environmental factors affect transpiration rates?
Temperature
Wind speed
Humidity
Surface area
How to measure effect of Temperature on Transpiration rate using Bubble Potometer?
Place the shoot in areas where the temperature differs
How to measure effect of Wind Speed on Transpiration rate using Bubble Potometer?
Using a fan with different settings
How to measure effect of Humidity on Transpiration rate using Bubble Potometer?
Cover the shoot with a polystyrene bag
How to measure effect of Surface Area on Transpiration rate using Bubble Potometer?
Have shoots with different sizes or number of leaves
What are the 2 main functions of the Circulatory System?
Transport of materials
Protection against disease
What is plasma?
Plasma is the liquid part of the blood
What 5 things does plasma transport?
Cells Digested food molecules CO2 Hormones Urea
What is the function of the Hepatic portal vein?
Transports dissolved food from intestine to liver
Heart disease cause, result?
- Coronary arteries blocked by high cholesterol
- Less oxygen and glucose to heart; less respiration; heart cells die; heart stops beating
Strokes cause, result?
- Blood vessel in brain blocked with cholesterol
- Less oxygen and glucose to brain; less respiration; brain cells die; reduced brain/body function