CSEE
Biology · Paper 2A · 2025
2 questions 🇹🇿 NECTA ✓ Official NECTA answers
CSEE
🇹🇿 NECTA
✓ Official NECTA answers
Biology · Paper 2A · 2025
2 questions
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200 TZS
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Questions (2)
Section A
1.
25 marks
You have been provided with specimens O and M, the chemical reagents and apparati. You are required to identify the food substances present in the specimens. Record your results in the table below.
| Food Tested | Procedure | Observation | Inference |
|---|---|---|---|
(a)
Prepare the solutions from specimen O and M for the food test experiments then, outline the procedures used to prepare each solution.
5 mk
(b)
Carry out experiments to identify the food substances present in specimens O and M as shown in the following table:
10 mk
(c)
State the function(s) of each food substance identified in 1(b) to the human body.
5 mk
(d)
Apart from the specimen provided, give another one example of a natural source from which the food substances identified in 1(b) could be obtained.
5 mk
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2.
25 marks
You have been provided with specimens E, F and G obtained from different habitat. Carefully study them and answer the following questions:
(a)
Identify the Phylum/Division and the Kingdom in which each specimen E, F and G belongs.
6 mk
(b)
For each of specimens E, F and G state three observable features which are characteristic of its respective Phylum/Division.
9 mk
(c)
Name the habitat of each of specimens E, F and G.
3 mk
(d)
For each of specimens E, F and G state whether it is a producer, consumer or decomposer in its natural habitat. Give reason for each case.
4 mk
(e)
State two advantages and one disadvantage of specimen E to other living organisms.
3 mk
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