Mention two breeding places to obtain protozoa for laboratory experiments and...

Here are the solutions to the biology questions:

SECTION B – AEB

11. Two breeding places to obtain protozoa for laboratory experiments are:

• Pond water
• Hay infusion

12. The function of methyl cellulose when viewing a protozoa sample under the microscope is to slow down the movement of the protozoa, making them easier to observe.

13. The objective lens first used to view a protozoan sample under the microscope is the lowest power objective lens (e.g., 4x or 10x).

14. The type of symmetry observed in laboratory dissected specimens:

• a) Porifera: Asymmetrical
• b) Cnidaria: Radial symmetry

15. The two parts of the scolex observed in a stained slide of Taenia pisiformis under low power objective lens are suckers and the rostellum (with hooks).

16. Two habitats in which samples of clamworms (Annelida: Polychaetes) can be collected are:

• Sandy marine bottoms
• Muddy marine bottoms

17. From laboratory observation, arthropods' body is unsegmented. False.

18. The internal organ of a dissected rat specimen that is directly below the diaphragm is the liver.

19. A dissected rat specimen has its caecum below the rectum. False.

20. The difference between Paramecium and Amoeba using their shape:

• a) Paramecium: Has a fixed, slipper-like or oval shape.
• b) Amoeba: Has an irregular, constantly changing shape due to pseudopods.

21. Another name for the laboratory apparatus "Medicine dropper" is a Pasteur pipette or dropper pipette.

SECTION C – MICROBIOLOGY

22. For routine purposes, an incubator temperature is maintained at:

• For bacteria: 37°C
• For moulds: 25°C

23. A centrifuge separates two or more substances based on their density (or mass/size).