Organisms In The Enviroment Flashcards
What does chlorophyll absorb
Suns light energy
What plants carry out photosynthesis
Green plants and algae
Word equation for photosynthesis
Carbon dioxide + water —-(light energy)—–> glucose + water
Process for photosynthesis
Carbon dioxide taken in by leaves and water up by roots. Chlorophyll traps light energy for photosynthesis. The light energy used to covert carbon dioxide and water into glucose, oxygen is released as a by-product.
What is some of the glucose converted into?
Insoluble starch for storage
How can you test for starch
Iodine (I owe dean money for starch)
How can you identify the starch in the leaf?
Green patches on leaf with chlorophyll will turn iodine black/blue to show that starch has been made
Where does the energy for photosynthesis come from?
Sun light energy
During photosynthesis what is light energy transferred to
Chemical energy
What’s the symbol equation for photosynthesis
CO2 + H2O —-> C6H12O6 + O2
Balance the symbol equation CO2 + H2O ——> C6H12O6 + O2
6CO2 + 6H2O —–> C6H12O6 + 6O2
Why do enzyme reactions slow down
If it is cold
When do plants grow best
When they have enough light, carbon dioxide and water and are kept at a suitable temp
What’s an independent variable
One that is being tested
Dependent variable
One you must measure
Control variable
One you keep the same
The uses of soluble glucose
Converted I to insoluble starch for storage, used fir respiration, converted into fats and oils, used to produce cellulose which strengthens cell walls, used to produce proteins
What do plants and algae need to make proteins
Nitrate ions which is a mineral ion
What factors must be controlled in a greenhouse to improve plant growth?
Temperature, light levels and carbon dioxide levels
Physical factors that affect the distribution of organisms
Temp, nutrients availability, amount of light, water availability, oxygen availability, carbon dioxide availability
Why are there so few animals living in very cold regions such as the Arctic
Arctic plants small limits number of plant eaters which can survive in area
What’s a quadrant
Square frame that can be subdivided into a grid
Range
High - low =?
Mean
Sum of readings divided by the number of readings
Median
Middle value when in order
Mode
Reading most frequent
How can you make sure an investigation is valid
That all variables are controlled
Repeatable
Original experiment repeats investigation using same method and equipment and obtains same results.
Reproducible
Investigation is repeated by another person or by using different equipment and same results obtained
Three physical factors affect the distribution of plants
Temp, light levels and carbon dioxide levels
Why would there be little point in heating a greenhouse on a summers day?
Enzymes denature and photosynthesis stops taking place
Limiting factor
Anything that puts a cap on the rate of photosynthesis
How can you use a quadrat to make a line transect
5metres from the start at each point to build up an understanding of the habitat/area
Difference between mean and median
Mean is average median in the middle
