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has been will come in place of have been; as, here we are talking about one spectrum including all the fields and not the fields individually so we will be using HAS(second or third person singular) in place of HAVE.(plural)
The four principles of organic farming do not include
Ballast elements are
Wart disease of potato is caused by _____
Concentration of argon in the atmosphere is
Wheat crop needs which climate during vegetative growth
MIC is used in the manufacture of which insecticide?
Which plant is used for control of blood pressure?
The gene responsible for dwarfing in rice is
The air temperature drop with increasing altitude. The average decrease in temperature drop is approximately _______. This is also known as “Environme...
Which of the following parts of the stomach is called “True stomach”?