81.
Effect of higher plants to lower plants is known as

82.
'Tarai' soils are deficient in

83.
Triazines are mostly used in

84.
Prussic acid is more in Sorghum

85.
Bacterial diseases are controlled by use of chemicals

86.
Which one of the following crops is most sensitive to both excess moisture and drought

87.
Country having the maximum area of hybrid rice is

88.
1$$\mathop {\text{A}}\limits^{\text{o}} $$ (Angstrom ) is equal to

89.
Leading country in oil palm production is

90.
pH change from 9 to 6, the H ion concentration will

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