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CSEE 🇹🇿 NECTA ✓ Official NECTA answers

Biology · Paper 2B · 2020

3 questions

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Questions (3)

Section A

1. 25 marks

You are provided with a piece of mirror and food samples labelled by letter A, B, C and D. Carry out experiments under procedures (i) – (v) and then answer the questions that follow: (i) Hold up a mirror in front of your face while opening your mouth widely, and note all sense organs reflected on the mirror. (ii) Carefully look at specimens C and D and note their coarseness. (iii) Touch both sample C and D and note their coarseness. (iv) Hold specimen D near the right ear, then shake it vigorously and note the sound that comes from inside. (v) Observe the food samples A, B, and C carefully. Do not taste the food sample in the laboratory.

(a) Identify the function of each sense organ identified in procedure (i). 4 mk
(b) Name the stimuli perceived by each of the sense organs identified in procedure (i). 4 mk
(c) What is the shape of the samples C and D? 2 mk
(d) Identify the coarseness of samples C and D. 2 mk
(e) Identify the contents producing the sound inside sample D. 2 mk
(f) Draw a well labeled diagram of sense organ observed in the mouth and locate the regions corresponding to the taste of the following food samples: (i) A (ii) B (iii) C. 7 mk
(g) Briefly explain how the nervous system recognizes the taste of food samples. 6 mk

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2. 25 marks

You are provided with specimens Q, R, S and T and answer the questions that follow:

(a) Classify the specimens Q, R and S from Phylum/Division to Class level. 15 mk
(b) What distinctive features of the specimen R makes it typical representative of its Class? 10 mk

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Section B

0. 0 marks

(c) What are the three observable differences between the specimens Q and R at Class level? 0 mk
(d) (i) What is the habitat of each of the specimens S and T? (ii) Identify three observable features which help the specimen T to adapt its habitat. 0 mk
(e) Give three advantages of the products produced by each specimens S and T for the development of processing industry in Tanzania. 0 mk

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