Structures and functions in living organisms

Question 1

Jan 2020 1BR Q8 EYE
Name the structures labelled A,B,C and D

Answer 1

A=Iris
B=Cornea
C=Pupil
D=Lens

Question 2

Jan 2020 1BR Q8

Answer 2

Ciliary muscles relaxes(1), which allows the suspensory ligament to pull tight(1). This makes the lens go thinner(1). So the light refracted by a smaller amount(1).

Question 3

Describe the role of the stomach
Jan 2020 1BR Q1

Answer 3

The stomach produces hydrochloric acid(1) to kill bacteria and create the optimum pH for enzymes. It also secretes the enzyme pepsin(protease) to break down proteins into peptides(short chain of amino acid).