Basic questions Flashcards
Why is staining used
To give more contrast between cell structures
Makes them easier to see
What is plant tissue stained with
Iodine
Animal tissue stained
Methylene blue
Why do chromosomes need to be stained
Because they are transparent
What is p=0.05
There is a 5% chance that the null hypothesis is true
Why is chi square used
To compare observed and expected results
Discontinuous data
Why is T test used
To compare two sets of continuous data
What is abiotic
Non living factors
What is biotic
Living factors
What are examples of biotic factors
Diseases
Predation
Competition
Examples of abiotic factors
Temp
Light intensity
Humidity
Wind speed
Nutrient supply
Water supply
What is hazard and risk of methylene blue
It’s an irritant
Could splash on skin when pouring
Hazard and risk of hot water
Can burn skin when pouring
Handle carefully
What must you say when talking about risk
When doing ….injury may occur
Why were they taken from single parent plant and grown under same conditions
Minimise genetic variation
Ensure only light is having an effect
Environmental factors that should be controlled whne growing plants for experiment
Soil temp
Air temp
Water availability
Minerals
Soil ph
Carbon dioxide
Why structures seem to appear to be in different shape from structure
Cut in different planes
Equipment for microscopy
Microscope
Eye piece graticule
Stage micrometer
Why is electron microscope better
Higher magnification
Higher resolution
Why can you not use electron microscopes to view live specimens
High energy electron beam would kill or damage the living cells
Reducing biodiversity factors
Over fishing
Over hunting
Pollution
Climate change
Deforestation
Grazing
Forest fires
Invasive alien species
