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 |
|
absence of diastema; |
|
presence of canine; |
|
presence of carnassial teeth; |
|
cusped molar. |
Note: points must correspond to score.
(ii) Human and Goat
Human |
Goat |
|
presence of diastema; |
|
absence of canine; |
|
absence of upper incisor; |
|
presence of dental pad; |
|
presence of twelve premolars; |
upper and lower jaw |
Presence of more incisors on |
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.