Question
What are the effects of air pollution?
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| Instrument / Technique | Purpose of use |
| Sphygmomanometer | ——————— |
| —————- | X-ray imaging of the cardiac blood vessels to locate the position of blockages. |
| ————— | To measure ECG. |
Explain the different factors responsible for genetic variations.
| Column A | Column B |
| (1) Symbiont in root nodule | ————- |
| (2) Conversion of nitrite to nitrate | ———— |
| (3) Denitrification process | ————- |
| (4) Conversion of ammonia to nitrite | ————- |