class 8 science ch 1 crop production and management exercise long answer type questions.
Answers
Answer:
1.Agriculture is important to human beings because it forms the basis for food security. It helps human beings grow the most ideal food crops and raise the right animals with accordance to environmental factors. ... Agriculture also helps humans know the right way to use land so as to avoid disasters like famines.
2. Steps used in modern agriculture:-
- penetrating the land.
- lavelling.
- sowing.
- irrigation.
- sprinkling pesticides.
- harvesting.
3.The advantages of ploughing are:
- Loosening of soil can improve air circulation.
- The roots can penetrate deeper into the soil, thus holding the plant firmly.
- Ploughing enhances the water retention capacity of the soil.
- Ploughing uproots the weeds growing in the field and aids in the growth of microbes.
4. Things to keep in mind while sowing seeds are:-
- Seeds should be grown at proper depth.
- They should be sown at a proper distance apart from each other.
- Seed used for sowing should be clean, healthy and free from any disease or infection.
5. Natural methods by which lost nutrients are replenished in the soil are: ... Vermi compost can be used as earthworms naturally help in maintaining soil fertility by aeration of soils for Growing leguminous plants which contain bacteria Rhizobium that fixes atmospheric N2.
6. Drip irrigation is a form of irrigation that saves water and fertiliser by allowing water to drip slowly to the roots of many different plants, either onto the soil surface or directly onto the root zone, through a network of valves, pipes, tubing, and emitters.
7. The main classes of crop protection chemicals are herbicides, insecticides and fungicides. Selective herbicides, for example, control the growth of weeds which would otherwise grow among a crop, competing with it for water, nutrients and sunlight. Without crop protection chemicals agriculture would be less efficient.
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