Page 152 - Biology Form Two

Biology for Secondary Schools

Delivery tube

Cork

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Test tube
Oil Test tube

Glucose + yeast Lime water

Figure 6.14: Experimental set-up to investigate anaerobic respiration

5. Leave the set-up in a warm place for an hour.

6. Observe the changes.
7. Prepare a short report about your observation.

Table 6. 5: Differences between aerobic and anaerobic respiration
Aerobic respiration Anaerobic respiration
(a) Oxygen is used (a) Oxygen is not used
(b) Large amount of energy is produced (b) Little energy is produced
(c) Water is produced (c) Water is not produced
(d) Food substances are completely (d) Food substances are not completely
broken down broken down

(e) It starts in the cytoplasm and ends in (e) Takes place in the cytoplasm
the mitochondria
(f) Carbon dioxide and water are the (f) Lactic acid is produced in animals
end-products and alcohol is produced in plants

Factors affecting the rate of respiration
The rate at which respiration takes place varies depending on the state of an
organism or that of the environment. Hence, respiration is sometimes fast and at
other times slow. The factors affecting the rate of respiration are presented below.

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