Biology P2

Question 1

Difference between population and community

Answer 1

Population is all of the same species in the habitat and community is the populations of all the different species in the habitat

Question 2

Peat bogs

Question 3

4 Ways land is used by humans

Answer 3

Farming
Quarrying
waste disposal
Building

Question 4

What is accomodation

Answer 4

Eye lens changing shape to focus image in retina

Question 5

Describe the path of stimuli to response in a reflex

Answer 5

Stimulus—receptor—sensory neuron—CNS—motor neuron—effector response

Question 6

What is myopia and hyperopia

Answer 6

Hyperopia is long sightedness so they cant focus on near things and the light focuses too past the eye

Myopia is short sightedness so they cant focus on far objects and the light focuses too early on the eye

Question 7

Describe how the eye focuses on near and far objects

Answer 7

For far objects the light needs less magnification (the line form the top and bottom of the object are almost parallel)so the lens needs to be flatter, the suspensory ligaments tighten and the muscles relax

For near objects the light needs more bending(the line from the top and bottom are diverging a lot) so lens needs to be rounder, the suspensory ligament are loose and the ciliary muscles tight

Question 8

Describe decay RP

Answer 8

Set amount of milk with an indicator(methyl orange) in a test tube and set amount of lipase enzyme in another test tube place both in water bath until same temp as the water

Mix together with glass rod and start timer

When colour changes it means that the milk is acidic because of the lipase turning lipids into fatty acids showing decay stop timer

Repeat for different temps to get different times showing how rate of decay changes with temp

CV: Amount of each substance