1. Which one of the following is not a plant hormone ?
(a) Cytokinin
(b) Ethylene
(c) Insulin
(d) Gibberellin
[U.P.P.C.S. (Mains) 2011]
Ans. (c) Insulin
- Insulin is a chemical made by the pancreas that helps control the amount of sugar in the blood.
- If the body doesn’t make enough insulin, it can cause diabetes. Plants also create hormones, such as cytokinin, ethylene, and gibberellin.
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2. Which one of the following is a plant hormone?
(a) Insulin
(b) Thyroxine
(c) Estrogen
(d) Cytokinin
[U.P.P.C.S. (Pre) (Re. Exam) 2015]
[U.P.P.C.S. (Mains) 2016]
Ans. (d) Cytokinin
- Plants produce special organic compounds called plant hormones. They help regulate processes within the plant, but only in small amounts.
- Examples of plant hormones are auxins, gibberellin, cytokinin, abscisic acid and ethylene.
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3. Which of the following is a plant hormone?
(a) Insulin
(b) Thyroxine
(c) Estrogen
(d) Cytokinin
(e) None of the above
[Chhattisgarh P.C.S. (Pre) 2014]
Ans. (d) Cytokinin
- Plants produce special organic compounds called plant hormones. They help regulate processes within the plant, but only in small amounts.
- Examples of plant hormones are auxins, gibberellin, cytokinin, abscisic acid and ethylene.
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4. Which one of the following is a plant hormone?
(a) Thyroxine
(b) Cytokinin
(c) Insulin
(d) None of the above
[U.P. Lower Sub. (Pre) 2015]
Ans. (b) Cytokinin
- Plants produce special organic compounds called plant hormones. They help regulate processes within the plant, but only in small amounts.
- Examples of plant hormones are auxins, gibberellin, cytokinin, abscisic acid and ethylene.
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5. Match List-I with List-II and select the correct answer
from the code given below the lists.
List-I List-II
(Plant hormone) (Function)
A. Auxin 1. Cell elongation
B. Gibberellin 2. Cell division
C. Cytokinin 3. Growth inhibition
D. Abscisic acid 4. Apical dominance
Code :
A B C D
(a) 2 3 4 1
(b) 4 1 2 3
(c) 3 4 2 1
(d) 4 1 3 2
[U.P. R.O./A.R.O. (Mains) 2016]
Ans. (b) 4 1 2 3
| The correctly matched lists of plant hormones and their functions are as follows :
(Plant hormone) (Function)
| Auxin |
Apical dominance |
| Gibberellin |
Cell elongation |
| Cytokinin |
Cell division |
| Abscisic acid |
Growth inhibition |
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6. The hormone related to drought tolerance is –
(a) Abscisic acid
(b) Gibberellin
(c) Indole acetic acid
(d) Cytokinin
[U.P. Lower Sub. (Pre) 2013]
Ans. (a) Abscisic acid
- In the early 1960s, scientists discovered a hormone called abscisic acid that helps plants survive during dry times.
- This hormone causes the stomata, or tiny pores, to close when there is not enough water.
- This makes it very useful for plants growing in dry soil, since it helps them conserve water. It is also known as the “stress hormone”.
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7. Which hormone is found in the gaseous form ?
(a) Abscisic acid
(b) Ethylene
(c) Gibberellins
(d) Auxins
(e) None of these
[Chhattisgarh P.C.S (Pre) 2013]
Ans. (b) Ethylene
- Ethylene is a hormone produced by plants that is present in gas form.
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8. The gas used in the artificial ripening of green fruit is :
(a) Acetylene
(b) Ethane
(c) Hydrogen
(d) Carbon dioxide
[U.P.P.C.S. (Pre) 1996]
Ans. (a) Acetylene
- The rule from 1955 about preventing food adulteration states that acetylene gas cannot be used to make fruits ripen.
- Calcium carbide is sometimes used to create acetylene gas, which is a man-made ripening agent.
- Nevertheless, it is not as effective as ethylene and it isn’t a natural plant hormone either.
- Additionally, calcium carbide may have traces of arsenic and phosphorus, which are both very poisonous to humans, so the use of this chemical for ripening is not allowed in most countries.
- On the other hand, ethylene has been proven to not be harmful or toxic when used in concentrations found in ripening rooms.
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9. The gas used for artificial ripening of green fruits is–
(a) Ethane
(b) Acetylene
(c) Carbon-dioxide
(d) Oxytocin
[Jharkhand P.C.S. (Pre) 2010]
[U.P. Lower Sub (Pre) 2008]
[U.P.P.C.S. (Mains) 2007]
Ans. (b) Acetylene
- The rule from 1955 about preventing food adulteration states that acetylene gas cannot be used to make fruits ripen.
- Calcium carbide is sometimes used to create acetylene gas, which is a man-made ripening agent.
- Nevertheless, it is not as effective as ethylene and it isn’t a natural plant hormone either.
- Additionally, calcium carbide may have traces of arsenic and phosphorus, which are both very poisonous to humans, so the use of this chemical for ripening is not allowed in most countries.
- On the other hand, ethylene has been proven to not be harmful or toxic when used in concentrations found in ripening rooms.
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10. Which of the following phytohormone is mainly
responsible for fruit ripening ?
(a) Cytokinin
(b) Abscisic acid
(c) Ethylene
(d) None of the above
[U.P.P.C.S. (Mains) 2009]
[U.P.P.C.S. (Pre) 2006]
Ans. (c) Ethylene
- The rule from 1955 about preventing food adulteration states that acetylene gas cannot be used to make fruits ripen.
- Calcium carbide is sometimes used to create acetylene gas, which is a man-made ripening agent.
- Nevertheless, it is not as effective as ethylene and it isn’t a natural plant hormone either.
- Additionally, calcium carbide may have traces of arsenic and phosphorus, which are both very poisonous to humans, so the use of this chemical for ripening is not allowed in most countries.
- On the other hand, ethylene has been proven to not be harmful or toxic when used in concentrations found in ripening rooms.
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11. It is possible to produce seedless tomato fruits by :
(a) Applying trace elements in tomato fruits
(b) Spraying mineral solution on plants
(c) Spraying hormones on flowers
(d) Applying fertilizers containing radioactive elements
[I.A.S. (Pre) 1996]
Ans. (c) Spraying hormones on flowers
- Parthenocarpy is a desirable trait for certain fruits like tomatoes and summer squash that can be hard to pollinate or fertilize.
- Spraying one of the plant hormones – gibberellin, auxin or cytokinin – on the flowers can cause seedless fruit to develop. This is called artificial parthenocarpy.
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