The one which is a weed killer is___________?
Correct answer: C. 2 4-D
- A. IAA
- B. NAA
- C. 2 4-D
- D. GA
Explanation
2,4-D is a synthetic auxin that acts as a selective herbicide, especially against many broad-leaved weeds. IAA and NAA are auxins mainly discussed as natural or synthetic plant-growth regulators, while GA is gibberellic acid and promotes growth. Students may choose IAA because it is an auxin, but it is not the standard weed killer named here.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Chemical Coordination and Hormones
Chemical coordination uses hormones released by endocrine glands and carried in blood to specific target cells. Coverage includes the pituitary, thyroid, pancreas, adrenal glands, ovaries and testes, feedback control, and the contrast between slower, longer-lasting hormonal responses and rapid nervous coordination.
Practise Coordination and Control
1,687 free Coordination and Control MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Chemical Coordination and Hormones questions
Chlorosis, i.e., yellowish hue on the leaves results from_____________?
Chemically auxins are____________?
Gibberellins may be substituted for ___________ light, therefore promote flowering in long day plants?
The one which causes contraction of wall of the uterus during and after birth?
Exposure to low temperature stimulates plants to flower. This is called___________?
Sleep movements are a type of___________?