1. Why Kharif crops cannot be grown in Rabi season?
2.What are organic foods?
3.How are manures prepared by the farmers?
4.What are the steps involved in soil preparation?
5.Name the two fertilizers containing nitrogen and other containing phosphorous
6.Write the uses of metals and non-metals in our daily life.
7.Sodium is stored in kerosene. Why?
8.Explain displacement reaction with the help of an activity.
9.Name two most ductile metals.
10.What are oxides? Write the nature of metallic and non-metallic oxides.
Answers
1. Kharif crops require a lot of water. In the kharif season, the rain provides this water and the kharif crops get sufficient water for their growth. ... So kharif crops can't be grown in the rabi season as they require more water for their growth
2. Organic food is food produced by methods that comply with the standards of organic farming. Standards vary worldwide, but organic farming features practices that cycle resources, promote ecological balance, and conserve biodiversity
3. Manure is a natural fertilizer and it is prepared from animal waste and decomposition of plants is collected by farmers. The outcome of this decomposition process is a matter which is rich in nutrients such as phosphorus, potassium, nitrogen, and sulfur
4. In agriculture, ploughing, leveling, and manuring are the three steps of soil preparation. Ploughing includes loosening and digging of soil. During ploughing, the soil becomes loose and the nutrients in deep soil come to the top.
5. Nitrogen-Phosphorus Fertilizers. Ammonium phosphates are produced by reacting ammonia with phosphoric acid or a mixture of phosphoric and either sulfuric or nitric acids. Ammonium phosphates are the leading nitrogen-phosphorus products in the fertilizer industry.
6.Uses of some common metals and non-metals are as follows. Metals Iron is used for making automobiles, machinery, pipes, containers, nails, etc. Gold and silver are used for making jewellery. Copper is used for making electrical wires, cooking utensils, etc.
7. sorry i don't know
8.Displacement reaction is a chemical reaction in which a more reactive element displaces a less reactive element from its compound. Both metals and non-metals take part in displacement reactions. Example : Reaction of iron nails with copper sulphate solution
9. Gold and silver r most ductile metals
10.oxide is a chemical compound that contains at least one oxygen atom and one other element in its chemical formula. metallic oxide are basic in nature while non metallic oxides are acidic in nature