Question

Data:

Table 1: A comparison of pH of the water in fish tanks with various amounts of fish and

aquatic plants after 1 week

Tank	Set-up	pH of water after 1 week
1	1 fish	5
2	1 fish and several aquatic plants	7
3	3 fish and several aquatic plants	6.7
4	Several aquatic plants	7
5	Several aquatic plants (tank wrapped in aluminum foil)	7
6	1 fish and several aquatic plants (tank wrapped in aluminum foil)	5.5

**Tanks 2, 3, 4 and 5 contained the same number of aquatic plants.

Part A Analysis:

1. a) List all of the final end products of: [5 marks]

Glycolysis –

Oxidative Decarboxylation –

Kreb’s Cycle –

b) List all of the starting materials of: [4 marks]

Stage 2 Photosynthesis (Electron Transport Chain and Chemiosmosis):

Calvin Cycle:

2. In which fish tank(s) was:[2 marks]

cellular respiration taking place?

photosynthesis taking place?

2. In terms of metabolic processes and levels of carbon dioxide, discuss reasons for the differences in pH observed in tanks 1, 2, 3, and 4. [3 marks]

2. Describe the types of metabolic processes occurring in tanks 5 and 6. Why did these two tanks differ in their pH levels? [3 marks]

Answer 1

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