PUMPA - SMART LEARNING
எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்
Book Free DemoFill in the blanks with the options given:
| Arsenic | Lead | Oxygen | Nickel |
| Nitrogen oxide | Absence | Ozone | Increase |
| Photosynthesis | Methyl isocyanate | Saturn | Oxygen |
| Sulphur oxide | Convention currents | Cellular | Air pollution |
1. The change in chemical composition of air is known as __________.
2. Oxygen is utilised to break down food molecules to get chemical energy for cellular activities by organisms which are known as __________ respiration.
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