Question

Find out the correct match (s)
(A). Dichlorovos - Weedicide
(B). Acephate - systemic Insecticide
(C). Benzyl benzoate - repellent
(D). 2 4-d - Weedicide
Choose the correct answer from the options given below:

• A. A is correctly matched B, C and D are not correctly matched
• B. A is incorrectly matched B, C and D are correctly matched
• C. A, B, C and D are correctly matched
• D. A, B, C and D are incorrectly matched

Hint:

Remember:
2,4-D $\rightarrow$ Selective Herbicide (Weedicide).
Dichlorvos (DDVP) $\rightarrow$ Organophosphate Insecticide (not a weedicide).
This helps eliminate incorrect options instantly.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Agrochemicals are classified into broad functional categories based on their target pests:
1. Insecticides: Control insect pests.
2. Herbicides (Weedicides): Control weeds and unwanted vegetation.
3. Repellents: Deter pests (insects or animals) from approaching or settling on a surface.
Furthermore, insecticides are classified based on their mode of action into contact poisons and systemic poisons (which are absorbed and translocated throughout the plant tissues).

Step 2: Detailed Explanation:
Let us evaluate each of the given pairings individually:
(A). Dichlorvos - Weedicide:
This pairing is incorrect.
Dichlorvos (also known as DDVP) is an organophosphate compound used as a broad-spectrum, volatile insecticide to control household and agricultural pests.
It is not a herbicide or weedicide.
(B). Acephate - systemic Insecticide:
This pairing is correct.
Acephate is an organophosphate insecticide that exhibits strong systemic and contact activity.
It is absorbed by plant roots and foliage and translocated throughout the plant, protecting it against sucking and chewing insects.
(C). Benzyl benzoate - repellent:
This pairing is correct.
Benzyl benzoate is an organic ester used primarily as an acaricide (to treat scabies and mites) and as an effective insect repellent against chiggers, ticks, and mosquitoes.
(D). 2,4-D - Weedicide:
This pairing is correct.
2,4-Dichlorophenoxyacetic acid (2,4-D) is a famous, widely used selective systemic herbicide (weedicide) that mimics auxins to control broadleaf weeds in cereal crops.
Therefore, pairing (A) is incorrectly matched, while pairings (B), (C), and (D) are correctly matched.
This corresponds to option (B).

Step 3: Final Answer:
Hence, the correct choice is represented by option (B).