O level south west regional mock gce 2022 human biology 2

O level south west regional mock gce 2022 human biology 2

O level south west regional mock gce 2022 human biology 2

SECTION A
1) a) Briefly describe the levels of organization within the human body and give an
(8 marks)
b)Draw a large and neatly labelled diagram of a typical animal cell as seen under the
electron microscope.
c)In which four ways do humans differ from other primates?
example of each.
(8 marks)
(4marks)
(5 marks)
(8 marks)
2) a) State the functions of the human skeletal system.
b) Describe how movement is brought about at the elbow joint.
c) In tabular form distinguish between
i) Cartilage and bone.
Tendon and ligaments.
3) a) Draw a large and neatly labelled diagram to show the transverse section through the
human eye.
a) State the causes and corrective measures for the following eye defects:
Myopia.
Presbyopia.
Astigmatism.
b) In tabular form differentiate between nervous and endocrine (hormonal) control
mechanisms.

4) a) Define each of the following terms
Excretion
ii) Osmoregulation
iii) Homeostasis
i)
(2,2,2 marks)
b) Draw a large and neatly labelled diagram of the longitudinal section through the
human kidney. (6 marks)
c) Describe the process of urine formation in the kidney nephron. (8 marks)
5) a) Define each of the following terms as used in genetics:
Phenotype.
Co-dominance.
Mutation.
b) In humans red-green colour-blindness is inherited as an X-linked recessive trait. A
with normal vision but whose father is colourblind marries a man with normal

woman
vision. Determine the genotypes, phenotypes and probabilities of their offspring.
(8 marks)
c) Describe how a human female carries out birth.