Biology Paper 2, May-June 2022

QUESTION 2
(a) Complete the table below by ticking (√) the appropriate
group to which each of the listed elements required by plants belongs.

Element	Group
Element	Microelement	Macroelement
Hydrogen
Copper
Magnesium
Zinc
Phosphorus
Manganese
Boron
Nitrogen
Carbon
Oxygen

[10 marks]

(b) State:
(i) three differences between definition of herbivore and a carnivore;
[3 marks]

(ii) four differences between the definition of a human and a goat.
[4 marks]
(c) What are milk teeth? [3 marks]

This question was also very popular among candidates.

They were able to complete the table by ticking the appropriate group to which each of the listed elements required by plants belongs.

They were also able to state the differences between the dentition of humans and a goat. Some candidates showed weaknesses in stating the differences between the dentition of a herbivore and a carnivore.

Some candidates could not also define and explain milk teeth.

The expected answers are:

2. (a) Table

*Element*	*Group*
*Element*	*Microelement*	*Macroelement*
Hydrogen		√
Copper	√
Magnesium		√
Zinc	√
Phosphorus		√
Manganese	√
Boron	√
Nitrogen		√
Carbon		√
Oxygen		√

(b) Differences between the dentition of a

(i) Herbivore and Carnivore

Herbivore	Carnivore
Presence of diastema	absence of diastema;
Absence of canine	presence of canine;
Absence of carnassial teeth	presence of carnassial teeth;
Ridged molar	cusped molar.

Note: points must correspond to score.

(ii) Human and Goat

Human	Goat
Absence of diastema	presence of diastema;
Presence of canine	absence of canine;
Presence of upper incisor	absence of upper incisor;
Absence of dental pad	presence of dental pad;
Presence of eight premolar	presence of twelve premolars;
Equal number of incisors in upper and lower jaw	Presence of more incisors on lower jaw.

Note: points must correspond to score.

Are the first set of teeth grown by the infants of a human;
are twenty in number;
made up of incisors, canines and molars;
premolars are absent;
the dental formula is I CM or I C PM;
they are also known as primary/temporal/deciduous teeth/they are shed and replaced by permanent teeth.

Biology Paper 2, WASSCE (SC), 2022