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Name the four laws of chemical combinations.
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______ source of bio-fertilizers.
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Match the following:
| 1. | Nostoc | a. | Pest |
| 2. | Bacillus | b. | Cyanobacteria |
| 3. | Cotton bollworm | c. | Legume |
| 4. | Rhizobium | d. |
Bio-pesticide |
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What is bio-control?
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What are bio-pesticides?
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What are the effects of acid rain? How can we prevent them?
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The same proportion of carbon and oxygen in the carbon dioxide obtained from different sources proves the law of ______.
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In water, hydrogen and oxygen are combined in the ratio of _____ by mass.
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State the law of constant proportions.
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Ruthresh, Hari, Kanishka, and Thahera collected different samples of water from a well, a pond, a river, and underground water. All these samples were sent to a testing laboratory. The test result showed the ratio of hydrogen to oxygen as 1:8.
- What conclusion would you draw from the above experiment?
- Which law of chemical combination does it obey?
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Name the microbe which converts atmospheric nitrogen directly into soluble nitrogen compounds.
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Write any two preventive measures for acid rain.
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