Science
11. Why does grain produce on a large scale?
12. How do you select good seed ? Give example.
13. Name some weedicides and why precaution taken on the time of spraying.
14. What is force? State its effect?
15. What is pressure ? Write its SI Unit?
16. State the difference between contact and non contact force ?
17. What is synthetic fibre. Give some example with use.
18. What is plastic ? Write its properties.
19. What is 4R ? Why plastic item not thrown in water?
Answers
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11 . Large-scale operators achieved higher resource use efficiency and lower carbon footprints compared to small households.
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Large-scale farming operations increased SOC stocks and system productivity in wheat-maize and wheat-rice rotation systems.
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Land use transfer and avoiding rice planting in water scarce area can help to gain cleaner production.
12- Seed is a basic input in agriculture. Strictly speaking seed is an embryo, a living organism embedded in the supporting or the food storage tissue. In seed, the importance is given to the biological existence whereas; in grain the importance is given to the supporting tissue the economic produce.
As per Seed Act (1966) seed includes
Seed of food crops including edible oil seeds and seeds of fruits & vegetables.
Cotton seeds
Seeds of cattle fodder
Jute seeds
Seedlings, tubers, bulbs, rhizomes, roots, cuttings, all types of grafts and other vegetatively propagated material for food crops (or) cattle fodder
Importance of quality seed
Ensures genetic and physical purity of the crops
Gives desired plant population
Capacity to withstand the adverse conditions
Seedlings produced will be more vigourous, fast growing and can resist pest and disease incidence to certain extent
Ensures uniform growth and maturity
Development of root system will be more efficient that aids absorption of nutrients efficiently and result in higher yield.
It will respond well to added fertilizer and other inputs.
Good quality seeds of improved varieties ensures higher yield atleast 10 – 12 %
13-weedicides is not the commonly used term . the correct term would be herbicide . herbicides are chemical which used tio kill or subdue the growth of specific plants , usually but not always weed . common herbicides are glyphosate 2,4-D , paraquat , diquat , triclopyr , bromacil , antrazine , simazine etc .
14 - The Effects of Forces. A force acting on an object may cause the object to change shape, to start moving, to stop moving, to accelerate or decelerate. When two objects interact with each other they exert a force on each other, the forces are equal in size but opposite in direction.
15-
What is pressure ? Write its SI Unit?
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The SI unit for pressure is the pascal (Pa), equal to one newton per square metre (N/m2, or kg. m. s−2). This name for the unit was added in 1971; before that, pressure in SI was expressed simply in newtons per square metre.
16 - A non-contact force is a force which acts on an object without coming physically in contact with it. The most familiar example of a non-contact force is gravity, which confers weight. In contrast a contact force is a force applied to a body by another body that is in contact with it.
17-Synthetic fabrics are textiles made from man-made rather than natural fibers. Examples of synthetic fabrics include polyester, acrylic, nylon, rayon, acetate, spandex, lastex,orlon and Kevlar.
18 - Plastics generally have resistance to corrosion and chemicals, low electrical and thermal conductivity, high strength-to-weight ratio, colors available in a wide variety and transparent, resistance to shock, good durability, low cost, are easy to manufacture, resistant to water and have low toxicity.
19 - We should not throw polythene bags in drains because it blocks the drains and the water cannot flow through the drain.