Question
Homo erectus.
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| Column I (Organic Acids] | Column II (Microbial source) |
| (1) Citric acid | (a) Rhizopus arrhizus |
| (2) Fumaric acid | (b) Acetobacter aceti |
| (3) Gluconic acid | (c) Aspergillus niger |
| (4) Acetic acid | (d) Aspergillus niger |
| Waves on ECG | Heart Activity | Caused due to |
| P wave | Atrial contraction | —————- |
| QRS wave | —————– | Ventricular depolarization |
| T wave | —————– | Ventricular repolarization |