Biology 1

Question 1

Describe one advance in science that could be used to help classify organisms that would not have been available 60 years ago. (2)

Answer 1

DNA analysis has allowed us to compare the genetics of organisms (1) so we can note similarities/differences (1).

Question 2

Explain why being fit may not keep you healthy. (2)

Answer 2

The ability to carry out physical exercise (1) does not stop or kill pathogens (1).

Question 3

Compare how the body deals with the extra glycogen and protein that is taken in. (2)

Answer 3

Excess glycogen is stored in the liver (1) but excess protein cannot be stored by the body (1).

Question 4

Explain the ways in which the spread of malaria could be controlled. (3)

Answer 4

Insecticides to kill adult mosquitos (1). Draining/Adding oil to stagnant water to kill mosquito larvae (1). Taking medication to kill Plasmodium in the body (1).

Question 5

How is vision affected if only one eye is used? (3)

Answer 5

Cannot judge distance (1)
Cannot see 3D images (1)
Narrow field of view (1)

Question 6

Explain what is meant by negative feedback. (2)

Answer 6

Negative feedback cancels out a change (1) to return to normal (1).

Question 7

How does selective weed killer work? (2)

Answer 7

Contains plant hormones (1) which make plants grow too fast (1).

Question 8

Explain what causes genetic variation. (3)

Answer 8

Mutations (1)
Random nature of fertilisation (1)
Gametes have different combinations of chromosomes (1)