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hodyreva [135]
2 years ago
8

Please answer the following questions correctly​

Biology
1 answer:
Oksi-84 [34.3K]2 years ago
6 0

Answer:

i.   Name each of the parts labelled I, II, III, IV and V.

                           {5 marks}

I - Crown / Enamel

II - Dentine

III - Cement / Periodontal membrane

IV - Jaw bone / Root

V - Pulp Cavity

ii   What is the function of each of the parts labelled I and III?

                    {2 marks}

I - Protects teeth from harmful bacteria

-- Enable teeth withstand pressure of chewing

-- Cutting / chewing / protects dentine / protect pulp cavity

III - hold tooth firmly (in socket / Jaw bone)

iii  Which of the labelled parts could be affected by tooth decay?

                                   {1 mark}

V - Pulp cavity

iv  State three ways by which tooth decay may be prevented.

                      {3 marks}

→ avoid using sharp-pointed objects

→ avoid having dry mouth

→ use water containing fluorides to wash teeth / mouth

→ avoid smoking

→ the teeth should be cleaned regularly after each meal / remove food particle from the teeth / flossing

→ wash the mouth vigorously after each meal

→ regular visit to the dentist

→ avoid eating too hot foods

→ avoid eating too much sugary food

→ avoid eating too cold food / taking too cold drinks

Explanation:

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a. <span>MU = (M + m)V; where M = 45 m, U = 8.9 m/s, find V = ?. V = (45/46)*8.9 = 8.7 m/s 
</span>
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