pp questions#

Question 1

adaptation

Answer 1

a physical or behavioural feature that helps an organism become more suited to its environment

Question 2

what happens to the pupil
and iris when bright light comes in

Answer 2

In brighter light iris contract to reduce pupil size (1)
Restricts light entering the eye, so retina is protected (from
damage) (1)

Question 3

rejection of a kidney

Answer 3

antigens on cells of donor kidneys (1)
white blood cells produce antibodies (specific to antigens) (1)
that {destroy/ act against} the {antigens/cells} (1)
Reject {kill/ fight/ attack} antigens

Question 4

uses of monoclonal antibodies

Answer 4

 diagnosis of [disease/chlamydia/HIV]
 tissue typing for transplants
 monitoring of the spread of malaria
 supporting chemotherapy for cancers
 pregnancy testing

Question 5

tropic response

Answer 5

Growth of a plant (organ) in response to a (one sided) stimulus
Reject movement/ bending

Question 6

what is the plant experiment wrong

Answer 6

1. they have not used a control
2. Plant subjected to both light and gravity/more than one
   variable being tested / plant could be showing negative
   gravitropism
3. set up {identical/same} experiment in the dark
4. to test only one variable/to eliminate light as a variable

Question 7

plant hormone

Answer 7

auxin responsible for phototropism