Biology Paper 2, WASSCE (SC), 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

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

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.                                         

      (c) Milk teeth

  • 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.