4. . Explain om crops are divided in India. Give Reasons. 1. Sometimes microorganisms are useful to us. How? 2. It is impossible to study the world of microbes without a microscope. Wh 3. Manure is better for soil than fertiliser. Why?
Answers
Answer:
4) The major crops in India can be divided into four categories viz. Food grains (Rice, Wheat, Maize, Millets and Pulses), Cash Crops (Cotton, Jute, Sugarcane, Tobacco, and Oilseeds), Plantation Crops (Tea, Coffee, Coconut and, Rubber) and Horticulture crops such as Fruits and Vegetables.
1)
Microorganisms are useful in producing foods, treating waste water, creating biofuels and a wide range of chemicals and enzymes. They are invaluable in research as model organisms. They have been weaponised and sometimes used in warfare and bioterrorism
2)
This is not visible to the naked eye due to the minute size of it. the microscope acts as a magnifying glass, and makes it easier to observe microbes. Hence, it is impossible to study the world of microbes without a microscope.
3)
Manures are considered better than fertilizers in maintaining soil fertility because: i) They add nutrients to the soil without affecting its fertility. Due to the presence of chemicals in fertilizers, when used constantly, they have the potential to decrease the fertility of the soil.