2023 past paper

Question 1

Organisms living in the same habitat are in the same what?

Answer 1

community

Question 2

What describes

Question 3

Where in the eye is the image focused

Answer 3

retina

Question 4

What happens to the shape of the lens when focusing on a near object

Answer 4

Becomes thicker

Question 5

FOUR control variables to include in a test like reaction times with caffeine

Answer 5

• Age
• Amount of sleep
• Volume of coffee
• Time intervals

Question 6

Suggest one advantage of producing tomatoes that are genetically different

Answer 6

• not all susceptible to the
  same disease / pathogen

Question 7

What is tissue culture?

Answer 7

A group of cells are grown into a new organism

Question 8

Describe selective breeding process (e.g. chickens that produce most eggs and meat)

Answer 8

breed best of A and B (together)
select offspring with highest egg
numbers and heaviest / fastest
growing
breed (these) offspring together
repeat over many / several
generations

Question 9

Process by which ADH reduces amount of water in urine

Answer 9

3 (kidney) tubules more permeable
to water
(so) more water is reabsorbed
(so) less water in urine causing
decreased rate of production (of
urine)
(so) less water in urine causing
higher concentration of dissolved
substances (in urine)

Question 10

Why would a lack of FSH cause underdeveloped breasts?

Answer 10

3 (lack of FSH causes) lack of
oestrogen (production)
breast development is
dependent on oestrogen (from
follicles)

Question 11

Why is the change in number of chromosomes important

Answer 11

(meiosis) forms gametes
(two gametes) fuse / fertilise
(so) keeps chromosome number
constant (from generation to
generation)

Question 12

How does meiosis produce cells that are genetically different

Answer 12

random chromosome from
each pair (of chromosomes)
moves to one end of the cell