Plankton, Nekton and Benthon are NOT the components of which one of the following ecosystems?
A. Marine water
B. Freshwater
C. Grassland
D. Pond
Answer: Option C
A. Marine water
B. Freshwater
C. Grassland
D. Pond
Answer: Option C
Downy Mildew of Bajra caused by
A. C. fusiformis
B. S. graminicola (Sclerospora)
C. T. penicillica
D. All of the above
The criteria of essentiality of nutrients in plants was given by
A. D. J. Nicholas
B. Arnon and Stout
C. J. S. Kanwar
D. M. S. Swaminathan
A. Manganese
B. Boron
C. Zinc
D. Iron
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