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Plant Physiology: III. Plant Hormones

📆 October 29, 2024

Total Questions: 11

1. Which one of the following is not a plant hormone? [U.P.P.C.S. (Mains) 2011]

Correct Answer: (c) Insulin
Solution:Insulin is a hormone produced in the pancreas by islets of Langerhans, which regulates the amount of glucose in the blood. The lack of insulin causes diabetes. Cytokinin, ethylene and gibberellin are plant hormones.

2. Which one of the following is a plant hormone? [U.P. R.O/A.R.O. (Mains) 2021, U.P.P.C.S. (Pre) (Re. Exam) 2015, U.P.P.C.S. (Mains) 2016]

Correct Answer: (d) Cytokinin
Solution:Plant hormones are naturally occurring special organic compounds found in plants. They affect and control many metabolic activities after being transported to different parts of the plants in very low quantity. Auxins, gibberellin, cytokinin, abscisic acid, and ethylene are examples of the plant hormone.

3. Which of the following is a plant hormone? [Chhattisgarh P.C.S. (Pre) 2014]

Correct Answer: (d) Cytokinin
Solution:Plant hormones are naturally occurring special organic compounds found in plants. They affect and control many metabolic activities after being transported to different parts of the plants in very low quantity. Auxins, gibberellin, cytokinin, abscisic acid, and ethylene are examples of the plant hormone.

4. Which one of the following is a plant hormone? [U.P. Lower Sub. (Pre) 2015]

Correct Answer: (b) Cytokinin
Solution:Plant hormones are naturally occurring special organic compounds found in plants. They affect and control many metabolic activities after being transported to different parts of the plants in very low quantity. Auxins, gibberellin, cytokinin, abscisic acid, and ethylene are examples of the plant hormone.

5. Match List-I with List-II and select the correct answer from the code given below the lists: [U.P. R.O/A.R.O. (Mains) 2016]

 

List-IList-II
(Plant hormone)(Function)
A. Auxin1. Cell elongation
B. Gibberellin2. Cell division
C. Cytokinin3. Growth inhibition
D. Abscisic acid4. Apical dominance

Code:

 

CodeABCD
(a)2341
(b)4123
(c)3421
(d)4132
Correct Answer: (b)
Solution:The correctly matched lists of plant hormones and their functions are as follows:
List-IList-II
(Plant hormone)(Function)
AuxinApical dominance
GibberellinCell elongation
CytokininCell division
Abscisic acidGrowth inhibition

6. The hormone related to drought tolerance is - [U.P. Lower Sub. (Pre) 2013]

Correct Answer: (a) Abscisic acid
Solution:The hormone abscisic acid was discovered in the early 1960s and plant biologists have known for decades that it plays a crucial role in keeping plants alive during the drought. Abscisic acid causes the temporary closure of stomata when there is a shortage of water. It is very useful for the plants growing in water deficient soil. It functions as antitranspirant and also known as the stress hormone.

7. Which hormone is found in the gaseous form? [Chhattisgarh P.C.S (Pre) 2013]

Correct Answer: (b) Ethylene
Solution:Ethylene is a phytohormone (plant hormone) which is found in gaseous form.

8. The gas used in the artificial ripening of green fruit is - [U.P.P.C.S. (Pre) 1996]

Correct Answer: (a) Acetylene
Solution:Under prevention of food adulteration rule, 1955: (Clause 44AA) acetylene gas cannot be used in the ripening of fruits. Calcium carbide is used in some countries as a source of acetylene gas, which is an artificial ripening agent. However, acetylene is not nearly as effective as ethylene and is not a natural plant hormone like ethylene. Also, calcium carbide may contain traces of arsenic and phosphorus, both highly toxic to humans and the use of this chemical for ripening is illegal in most countries. Ethylene has been found not harmful or toxic to humans in the concentrations found in ripening rooms.

9. The gas used for artificial ripening of green fruits is - [Jharkhand P.C.S. (Pre) 2010, U.P. Lower Sub (Pre) 2008, U.P.P.C.S. (Mains) 2007]

Correct Answer: (b) Acetylene
Solution:Under prevention of food adulteration rule, 1955: (Clause 44AA) acetylene gas cannot be used in the ripening of fruits. Calcium carbide is used in some countries as a source of acetylene gas, which is an artificial ripening agent. However, acetylene is not nearly as effective as ethylene and is not a natural plant hormone like ethylene. Also, calcium carbide may contain traces of arsenic and phosphorus, both highly toxic to humans and the use of this chemical for ripening is illegal in most countries. Ethylene has been found not harmful or toxic to humans in the concentrations found in ripening rooms.

10. Which of the following phytohormone is mainly responsible for fruit ripening? [U.P.P.C.S. (Mains) 2009, U.P.P.C.S. (Pre) 2006]

Correct Answer: (c) Ethylene
Solution:Under prevention of food adulteration rule, 1955: (Clause 44AA) acetylene gas cannot be used in the ripening of fruits. Calcium carbide is used in some countries as a source of acetylene gas, which is an artificial ripening agent. However, acetylene is not nearly as effective as ethylene and is not a natural plant hormone like ethylene. Also, calcium carbide may contain traces of arsenic and phosphorus, both highly toxic to humans and the use of this chemical for ripening is illegal in most countries. Ethylene has been found not harmful or toxic to humans in the concentrations found in ripening rooms.
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