1. Which of the following is a synthetic auxin?
A.
2,4-D
B.
Gibberellin
C.
Ethylene
D.
Cytokinin
Correct Answer:
2,4-D
Explanation:
2,4-D, or 2,4-dichlorophenoxyacetic acid, is a commonly used synthetic auxin.
2. Which synthetic auxin is commonly used as a selective weed killer?
A.
2,4-D
B.
Kinetin
C.
Abscisic acid
D.
Gibberellic acid
Correct Answer:
2,4-D
Explanation:
2,4-D acts as a selective herbicide and is used to control many broad-leaved weeds.
3. Which synthetic auxin is commonly used to promote rooting in stem cuttings?
A.
Indole-3-butyric acid
B.
Ethylene
C.
Zeatin
D.
Abscisic acid
Correct Answer:
Indole-3-butyric acid
Explanation:
Indole-3-butyric acid, or IBA, is a synthetic auxin widely used to stimulate root formation in cuttings.
4. Naphthalene acetic acid is commonly abbreviated as:
A.
NAA
B.
IAA
C.
ABA
D.
GA3
Correct Answer:
NAA
Explanation:
Naphthalene acetic acid is a synthetic auxin commonly abbreviated as NAA.
5. Which synthetic auxin may be used to induce rooting in plant cuttings?
A.
NAA
B.
Ethylene
C.
Cytokinin
D.
Gibberellin
Correct Answer:
NAA
Explanation:
NAA is a synthetic auxin that can promote the development of roots in suitable plant cuttings.
6. Synthetic auxins are mainly used in horticulture to:
A.
Promote rooting of cuttings
B.
Produce chlorophyll directly
C.
Break down proteins
D.
Stop all cell division
Correct Answer:
Promote rooting of cuttings
Explanation:
Synthetic auxins such as IBA and NAA are applied to cuttings to encourage root formation.
7. Which synthetic auxin is used in very low concentrations to help prevent premature fruit drop in some crops?
A.
NAA
B.
Kinetin
C.
Ethylene
D.
Abscisic acid
Correct Answer:
NAA
Explanation:
NAA can be used in suitable low concentrations to help reduce premature fruit drop in certain crops.
8. The synthetic auxin 2,4-D is especially effective against:
A.
Broad-leaved weeds
B.
All plant diseases
C.
Insect larvae only
D.
Fungal spores only
Correct Answer:
Broad-leaved weeds
Explanation:
2,4-D is a selective synthetic auxin herbicide that is particularly effective against many broad-leaved weeds.
9. Which substance is used as a synthetic auxin in rooting powders?
A.
IBA
B.
Ethylene
C.
Cytokinin
D.
Abscisic acid
Correct Answer:
IBA
Explanation:
IBA is commonly included in rooting powders because it promotes root formation in plant cuttings.
10. A synthetic auxin is best described as a:
A.
Man-made chemical with auxin-like effects
B.
Natural gas produced during fruit ripening
C.
Pigment found in chloroplasts
D.
Protein-digesting enzyme
Correct Answer:
Man-made chemical with auxin-like effects
Explanation:
Synthetic auxins are manufactured chemicals that produce effects similar to those of natural auxins in plants.
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