A) Herbicides kill .paint mostly by blocking PS-11 (photolysis of water) and occasionally phloem transport
B) Insecticides kill insects mostly through impairment of nerve conduction and sometimes through respiratory arrest
C) both (a) and (b)
D) None of the above
Correct Answer: C
Solution :
The herbicides (DCMU, CMU) act by blocking PS-II (\[{{O}_{2}}\] evolution) of photosynthesis and the insecticides (contact poisons) kill the insects either by clogging spiracles and respiratory system or by entering in blood acting as nerve or general tissue poison.
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