Which of the following is a symbiotic nitrogen fixer?
Glomus
Azotobacter
Frankia
Azolla
The major portion of the dry weight of plants comprises of
carbon, hydrogen, and oxygen.
nitrogen, phosphorus and potassium
calcium, magnesium and sulphur
carbon, nitrogen and hydrogen.
Enzyme involved in nitrogen assimilation
nitrogenase
nitrate reductase
transferase
transaminase
Gray spots of oat are caused by deficiency of
Fe
Cu
Zn
Mn
Which one of the following is a micronutrient for plants?
Calcium
Magnesium
Manganese
Nitrogen
Zinc as a nutrient is used by the plants in the form of :-
Zn2+
ZnO
ZnSO4
Which of the following is a free living aerobic non-photosynthetic nitrogen-fixer?
Rhizobium
Azospirillum
Nostoc
Which of the following is not caused by deficiency of mineral nutrition?
Necrosis
Chlorosis
Etiolation
Shortening of internodes
Dough kept overnight in warm weather becomes soft and spongy because of
absorption of carbon dioxide from atmosphere.
fermentation
cohesion
osmosis
Amino acids are mostly synthesized from
mineral salts
fatty acids
volatile acids
α- ketoglutaric acid