1 – Correct
The statement itself is correct. This require pre-requisite knowledge of aerobic respiration and anaerobic respiration.
2 – Wrong
Anaerobic respiration does not require oxygen therefore causing an oxygen debt.
3 – Wrong
Water is also formed as a waste product by aerobic respiration.
4 – Correct
Active uptake (or active transport) require ATP to work. ATP is formed by aerobic respiration. If aerobic respiration is reduced, then there will less active transport.
5 – Wrong
Since there is still some oxygen, aerobic respiration together with anaerobic respiration will occur.
6 – Correct
The statement itself is correct. This require pre-requisite knowledge of anaerobic respiration
1, 4 and 6 are correct. Hence, E is the answer.