Correct answer
A. None of the above
Explanation
The correct answer is None of the above.
Grass hopper, cricket have mouth parts________?
Calf diphtheria is a disease caused by ________?
The toxicity level of Zn (mg/kg) in plants suggested by some workers is________?
The most abundant metal in the earth’s crust and toxic to plants in low concentration is________?
________ may be defined as the art and science of cutting away of portion of plant to improve its shape, to influence its growth, flowering and fruitfulness and to improve the quality of the product:
Cotesia flavipers is endo larval parasite of________?