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प्रश्न
Complete the following cycle given as figure by filling the boxes (a), (b),(c), (d).
उत्तर
The cycle given above represents the nitrogen cycle occurring in the environment.
The atmospheric nitrogen cannot be up taken by plants and animals as such, this is corrected by some bacteria and blue-green algae present in the soil. These microbes fix the atmospheric nitrogen into usable components which are utilised by other living ’organisms.
Nitrogen cycle checks the percentage of nitrogen in the atmosphere and maintains it at a constant level.
- Lightning fixes nitrogen.
- Nitrogen fixing bacteria and blue-green algae fix atmospheric nitrogen.
- Nitrogenous waste from excretion and death.
- Bacteria turns compounds of nitrogen into gaseous nitrogen.
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संबंधित प्रश्न
Talk to the elderly people in your family to find the answers to the following questions, with reference to the foodstuffs mentioned below: Milk, vegetables, grains, flours, sugar, jaggery.
What measures are taken to keep the foodstuffs in the house in good condition, for as long as possible?
What’s the solution?
The papads have become soft and moist.
What are the different methods of preserving food?
_____ gives us the energy to work and play.
Explain any four food preservation methods.
Irradiation affects the taste of the food materials.
Which one can be preserved by drying method?
Match the following:
| 1. | Vacuum drying | a. | Vegetables |
| 2. | Cold storage | b. | Seeds |
| 3. | Deep freezing | c. | Cheese powder |
| 4. | Canning | d. | Meat |
List the methods of food preservation.
Why is sugar used to preserve fruits and fruit products?
