Jaivik Khad ka mukhya strot hai
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(i) An electric bell is suspended by thin wires in a glass vessel and set ringing. Describe and explain what happens if the air is gradually pumped out of the glass vessel.
​(ii) Why cannot a sound be heard on the moon? How do astronauts talk to one another on the surface of moon?
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Plant nutrients, earthworms, cowdung and nutrients from soil.
Explanation:
- Organic fertilizers or manures are important for the growth of plants as it will provide proper nutrients to the plants. The organic fertilizers do not harm the plants, animals and are eco- friendly in nature.
- Even its excess dose do not degrade the fertility of soil. Three main types of manures are - compost, vermi - compost and green manures.
- Compost uses the soil, cowdung and stored in a pit that are later supplied the plants. Vermi-compost uses earthworm in addition to the component of compost.
- Plant manures uses the plant component and its waste like litter, leaf and vegetable peels for the preparation of manures.
# Learn more with brainly about organic manures :
Definition of manures: https://brainly.in/question/6514353.
Types of manures : https://brainly.in/question/8816982.
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