Biology · Paper 2B · 2022
3 questions 🇹🇿 NECTA ✓ MS3-hour timed simulation · auto-graded · counts toward ranking
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Section A
Dissect the provided specimen T in the usual way to display the reproductive system and respond to the following questions: (a) Why should the specimen be anaesthetized before dissection? (b) Draw a diagram of the dissected specimen T and label five parts that form the reproductive system. (c) What is the sex of specimen T? Give four reasons.
- Why should the specimen be anaesthetized before dissection? (0 mk)
- Draw a diagram of the dissected specimen T and label five parts that form the reproductive system. (0 mk)
- What is the sex of specimen T? Give four reasons. (0 mk)
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Section B
You are provided with solution U and answer the following questions: (a) Using the reagents provided, carry out the biochemical test to identify food substance (s) contained in solution U. Tabulate your results, as shown in the following table: Food Test Procedure Observation Inference (b) Identify two natural food stuffs from which solution U could have been extracted from. (c) State the first site of digestion, the digestive juice and the product of digestion of the food substances identified in solution U.
- Using the reagents provided, carry out the biochemical test to identify food substance (s) contained in solution U. Tabulate your results, as shown in the following table: Food Test Procedure Observation Inference (0 mk)
- Identify two natural food stuffs from which solution U could have been extracted from. (0 mk)
- State the first site of digestion, the digestive juice and the product of digestion of the food substances identified in solution U. (0 mk)
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Section C
Observe the provided specimens V, W and Y and then answer the following questions: (a) In what ways is specimen Y useful to human beings? Give two points. (b) Why is specimen Y placed in the Class Insecta? Give three reasons. (c) Using three observable features, differentiate between specimen V and Y. (d) Draw specimen W and label three parts
- In what ways is specimen Y useful to human beings? Give two points. (0 mk)
- Why is specimen Y placed in the Class Insecta? Give three reasons. (0 mk)
- Using three observable features, differentiate between specimen V and Y. (0 mk)
- Draw specimen W and label three parts (0 mk)
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