answer the question of biology
Answers
9. a) These pictures represent the traditional methods of irrigation. (i) Moat (ii) Sprinkler system
b)Sprinkler system is more effective because it covers most of the land .
c ) Sprinkler system is more effective, this system is more useful on uneven lands epwhere sufficient water is not available
10. The nitrogen cycle is a repeating cycle of processes during which nitrogen moves through both living and non-living things: the atmosphere, soil, water, plants, animals and bacteria. In order to move through the different parts of the cycle, nitrogen must change forms.It is an important part of many cells and processes such as amino acids, proteins and even our DNA. It is also needed to make chlorophyll in plants, which is used in photosynthesis to make their food. As part of these life processes, nitrogen is transformed from one chemical form to another.
11.
Animal cell:
1. An animal cell does not have a cell wall.
2. Whereas there are very small vacuoles as compared to plant cells are seen in animal cells.
3. Smaller in size.
4. Animal cells do not have plastids.
5. Animal cells have centrosomes.
6. Animal cells have
7. Animal cells have lysosomes.
Plant cell:
1. A plant cell is surrounded by a rigid cell wall.
2. Presence of a large vacuole is seen in plant cells.
3. Larger in size.
4. Plant cells have plastids.
5. Centrosomes are absent in plant cells
6. Plant cells do not have
7. Lysosomes are very rare in plant cells.
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