Question

Which of the following is a weed killer?
A.2, 4-D
B.NAA
C.ABA
D.${ GA }_{ 3 }$

Answer 1

Hint: It is a fundamental herbicide that specifically murders most broadleaf weeds by causing uncontrolled development in them however most grasses, for example, grains, yard turf, and prairie are generally unaffected.

Complete answer:
Over the span of exploration on auxin science, numerous mixes with perceptible auxin movement were combined. Huge numbers of them had been found to have the conservative potential for man-controlled development and improvement of plants in agronomy. Auxins are harmful to plants in enormous fixations. They are generally poisonous to dicots and less so to monocots. In view of this property, manufactured auxin herbicides, including 2, 4-D and 2, 4, 5-T, have been created and utilized for weed control. In any case, engineered auxins, particularly 1-naphthaleneacetic corrosive (NAA) and indole-3-butyric corrosive (IBA), are additionally ordinarily applied to invigorate root development when taking cuttings of plants or for various agrarian purposes, for example, the counteraction of organic product drop in plantations. Utilized in high portions, auxin animates the creation of ethylene. Abundance ethylene (likewise local plant hormone) can hinder stretching development, cause leaves to fall (abscission), and even murder the plant. GA3 and ABA are not utilized as weed executioners.

Additional Information: 2, 4-D is one of the most seasoned and most broadly accessible herbicides and defoliants on the planet, having been economically accessible since 1945, and is currently created by numerous synthetic organizations since the patent on it has since a long time ago lapsed. It tends to be found in various business grass herbicide blends, and is generally utilized as a weed killer on grain yields, fields, and plantations.
So, the correct answer is ‘2, 4-D’.

Note: 2, 4-Dichlorophenoxyacetic corrosive is a natural compound with the substance equation C8H6Cl2O3 which is normally alluded to by its ISO regular name 2, 4-D. More than 1,500 herbicide items contain 2, 4-D as a functioning fixing