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Our experienced subject-matter experts have meticulously designed this set of Important Questions on Auxine Hormone to give you the most standard set of study materials to be focused upon. After finishing every topic or component of the syllabus, it is recommended to solve questions either asked in the previous year papers or given in a mock. This article, including only questions, is aimed to make you understand and attempt a particular syllabus domain effectively. Read the full article and download the PDF.
Important Questions on Auxine Hormone
1. The following table matches the correct columns:-
| Column | Column |
P. | Auxin | 1. Embryogenesis |
Q. | Protoplast culture | 2. 6-Furfurylaminopurine |
R. | Cytokinin | 3. Pectinase and Cellulase |
S. | Microspore culture | 4. Indole-3-acetic acid |
- P- 3, Q-4
- Q- 2, R-1
- R-1, S-1
- P-4, Q-3
2. The structure of this Auxin hormone is related to one of the following amino acids?
- Glutamic acid
- Aspartic acid
- Lysine
- Tryptophan
3. Choose the correct option to match Plant Growth Regulators with their corresponding precursor molecules:-
| Phytohormone | Precursor molecules |
P. | Brassinolide | 1. L-Tryptophan |
Q. | Cytokinin | 2. Methionine |
R. | Ethylene | 3. Campesterol |
S. | Auxin | 4. Alpha-linolenic acid |
- P-3, A P-3, S-1
- Q- 3 ,S- 2
- R- 3, S-2
- S-3, R-4
4. Choose the incorrect option regarding polar transport of auxin
- Polar auxin transport in root tends to be both acropetal and basipetal in direction
- NPA is not an inhibitor of polar auxin transport
- AUXI and PINI proteins are located in the opposite ends of the cell for polar transport
5. Given Column A and Column B
Column A | Column B | |
P. | Auxin | a. Delayed leaf senescence |
Q. | Gibberellins | b. Epinasty bending of leaves |
R. | Cytokinin | c. Polar Transport |
S. | Ethylene | d. Removal of seed dormancy |
Select The correct set of combinations from the options given below:-
- P-c, Q- d, R-a
- P-d, Q-a, R-c
- P-b, Q- c, R-a
- P-c, Q- d, R- c
6. Given below Auxin signal transduction pathway
- ARFs are nuclear proteins that bind to auxin response elements to activate or repress gene transcription.
- AUXIIAA proteins are secondary regulators of auxin-induced gene expression, Binding of AUX/IAA proteins to the ARF protein blocks its transcription regulation,
- Auxin binding to TIRI/AFB promotes ubiquitin-mediated degradation and removal of AUX/IAA proteins.
- Auxin binding to auxin response factors (ARFs) causes their destruction by the 26S proteasome pathway.
Which one of the following combinations of the above statements is correct?
- a,b,c
- b.c,d
- a ,c,d
- d ,c,b
7. Plants make several hormones that are important for growth and development. Some statements on plant hormones are given below:
- Auxin is produced primarily in the root apices
- Cytokinins are a smaller group of related compounds.
- Gibberellins are a large group of related compounds defined not by their biological functions but by their structures.
- Brassinosteroids are an important class of plant hormones, which control a broad spectrum of developmental responses including pollen tube growth.
Which one of the following combinations of the above statements is correct?
- a, b and c
- c and d
- a, c and d
- a, b and d
8. Select the CORRECT set comprising only the synthetic analogues of Auxin and cytokinin:
- IAA and Kinetin
- 2. 4-D and Zeatin
- IAA and Zeatin
- 2, 4-D and Kinetin
9. Statements for regeneration of plants from explants/tissue are given below:-
- If Cytokinin/ Auxin ratio is more root will develop more
- If Auxin/Cytokinin ratio is more shoot development occurs
- If auxin /Cytokinin ratio root will grow more.
- If auxin/ cytokinin is less shoot will development
Which of the following combinations of the above statements is true?
- c,d
- a,b
- a,c
- b,c
10. Some seeds were planted on plates medium. Seeds were found to germinate late. What may be the reason behind it?
- Jasmonic acid
- Cytokinin
- Auxin
- Abscisic acid
Answer Key
- D
- D
- A
- B
- A
- A
- B
- D
- A
- D
Solutions
Solution 1:
- Auxin is Indol 3 acitic acid.
- Protoplast culture is related to pectinase and cellulose.
- Cytokinin is 6-Furfurylaminopurine.
- Microspore culture is related to embryogenesis
Solution 2:
Tryptophan is the Precursor of IAA,
Solution 3:
- Auxin is the precursor of Tryptophan.
- Alpha-linolenic acid is a component of the Jasmonic acid Biosynthesis pathway
- Brassinolide is derived from plant sterol Campesterol
Solution 4:
NPA (Napthylphthalamic acid) is the inhibitor of Polar Auxin Transport, so B is incorrect. All other options regarding polar transport are correct.
Solution 5:
- Auxin hormone transport is polar
- Gibberellin is responsible for the removal of dormancy.
- Cytokinin delays Senescence.
Solution 6:
According to the pathway shown option 4 is incorrect since ARF is not degraded by proteasome-mediated pathway Instead AUX/IAA is degraded.
Solution 7:
A option is incorrect since Auxin is primarily produced in shoot apical meristem.
Solution 8:
- 2,4-D is the synthetic form of Auxin
- And Kinetin is the synthetic form of Cytokine
Solution 9:
Cytokine is responsible for shoot growth and auxin is for root. So if auxin/cytokinin is more root will grow more similarly if Auxin/cytokinin ratio is less shoot will grow more. So, the auxin and cytokinin ratio is very important.
Solution 10:
Abscisic acid because it inhibits precocious germination
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