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All questions of Plant Hormones for UPSC CSE Exam
Which of the following hormone help in the cell division and development in the presence of auxins?- a)Ethylene
- b)Cytokinins
- c)Auxins
- d)Florigens
Correct answer is option 'B'. Can you explain this answer?
Which of the following hormone help in the cell division and development in the presence of auxins?
a)
Ethylene
b)
Cytokinins
c)
Auxins
d)
Florigens
 | Saanvi Mehta answered |
Role of Cytokinins in Cell Division
Cytokinins are a class of plant hormones that play a vital role in cell division and development. Their interaction with other hormones, particularly auxins, is crucial for various growth processes.
Key Functions of Cytokinins:
- Promotion of Cell Division:
Cytokinins stimulate the mitotic activity in plant cells, leading to increased cell division, particularly in conjunction with auxins. This enhances tissue growth and organ development.
- Synergistic Effects with Auxins:
When cytokinins are present alongside auxins, they amplify the effects of auxins on cell division and differentiation. While auxins promote elongation and growth, cytokinins encourage the formation of new cells.
- Influence on Shoot and Root Development:
The balance of auxins and cytokinins determines the growth patterns in plants. High levels of auxins with cytokinins favor shoot development, while lower levels can promote root formation.
Other Plant Hormones:
- Ethylene:
Primarily involved in fruit ripening and responses to stress, not directly in cell division.
- Auxins:
While they are crucial for growth and elongation, they primarily work in synergy with cytokinins rather than acting alone in cell division.
- Florigens:
These hormones are associated with flowering rather than cell division.
Conclusion:
In summary, cytokinins are essential for promoting cell division and development, especially in the presence of auxins. Their synergistic relationship is fundamental to proper plant growth and morphology, making option 'B' the correct answer.
Cytokinins are a class of plant hormones that play a vital role in cell division and development. Their interaction with other hormones, particularly auxins, is crucial for various growth processes.
Key Functions of Cytokinins:
- Promotion of Cell Division:
Cytokinins stimulate the mitotic activity in plant cells, leading to increased cell division, particularly in conjunction with auxins. This enhances tissue growth and organ development.
- Synergistic Effects with Auxins:
When cytokinins are present alongside auxins, they amplify the effects of auxins on cell division and differentiation. While auxins promote elongation and growth, cytokinins encourage the formation of new cells.
- Influence on Shoot and Root Development:
The balance of auxins and cytokinins determines the growth patterns in plants. High levels of auxins with cytokinins favor shoot development, while lower levels can promote root formation.
Other Plant Hormones:
- Ethylene:
Primarily involved in fruit ripening and responses to stress, not directly in cell division.
- Auxins:
While they are crucial for growth and elongation, they primarily work in synergy with cytokinins rather than acting alone in cell division.
- Florigens:
These hormones are associated with flowering rather than cell division.
Conclusion:
In summary, cytokinins are essential for promoting cell division and development, especially in the presence of auxins. Their synergistic relationship is fundamental to proper plant growth and morphology, making option 'B' the correct answer.
Name the plant hormone which increases the activity of cambium in the wooden plants?- a)Gibberellins
- b)Cytokinins
- c)Auxins
- d)Ethylene
Correct answer is option 'A'. Can you explain this answer?
Name the plant hormone which increases the activity of cambium in the wooden plants?
a)
Gibberellins
b)
Cytokinins
c)
Auxins
d)
Ethylene
 | Knowledge Center answered |
While seeing the above Questions and Answers on Plant hormones we come to know how these hormones plays a vital role in plant life. Plant hormones help in growth of plants, in flowering, breaks the dormancy of seed, destroys the straws etc.
Which of the following hormone is found in gaseous form?- a)Florigens
- b)Abscisic Acid
- c)Ethylene
- d)Auxin
Correct answer is option 'C'. Can you explain this answer?
Which of the following hormone is found in gaseous form?
a)
Florigens
b)
Abscisic Acid
c)
Ethylene
d)
Auxin
| | Knowledge Center answered |
Ethylene is the plant hormone that is found in gaseous form. It is the only gaseous hormone among the options listed. Ethylene plays a significant role in various aspects of plant growth and development, including fruit ripening, leaf senescence (aging), and the response to environmental stresses.
Ethylene is produced naturally by plants and is released as a gas into the surrounding environment. It can diffuse through the air and affect nearby plants and tissues. The gaseous nature of ethylene allows it to act as a signal molecule, triggering physiological and developmental changes in plants.
Florigens, abscisic acid, and auxin are not gaseous hormones. Florigens are transported through the phloem, abscisic acid is a soluble hormone, and auxin is a soluble hormone that can be transported through the plant's vascular system.
Which hormone is formed in leaves and helps in the blooming of the flowers?- a)Traumatic
- b)Auxin
- c)Florigens
- d)None of the above
Correct answer is option 'C'. Can you explain this answer?
Which hormone is formed in leaves and helps in the blooming of the flowers?
a)
Traumatic
b)
Auxin
c)
Florigens
d)
None of the above
| | Knowledge Center answered |
Florigens are the plant hormones that are formed in leaves and play a key role in the blooming or flowering of plants. They are responsible for initiating the transition from the vegetative phase to the reproductive phase in plants, leading to the formation of flowers.
Florigens are specifically involved in promoting the initiation of flowering in response to various environmental and internal cues, such as day length and age of the plant. They are synthesized in the leaves and then transported to the apical meristem, where they induce the development of floral structures.
Neither traumatic nor auxin hormones are directly associated with the blooming of flowers. Traumatic hormone is not a recognized plant hormone, and auxin primarily plays a role in various aspects of plant growth and development, but not specifically in flowering.
Which of the following statement is incorrect?- a)Auxins are the most important plant hormone.
- b)Auxins are produced at the region of elongation.
- c)Indoleacetic Acid (IAA) is a principal auxin.
- d)Auxins are also important in regulating the fall of leaves and fruits.
Correct answer is option 'B'. Can you explain this answer?
Which of the following statement is incorrect?
a)
Auxins are the most important plant hormone.
b)
Auxins are produced at the region of elongation.
c)
Indoleacetic Acid (IAA) is a principal auxin.
d)
Auxins are also important in regulating the fall of leaves and fruits.
 | Knowledge Hub answered |
Auxins are not specifically produced at the region of elongation. Instead, they are primarily synthesized in the apical meristems of the plant, particularly in the shoot apical meristem and young leaves. From there, auxins are transported downwards towards the region of elongation, where they play a crucial role in cell elongation and growth. So, while auxins are involved in the regulation of elongation, they are not produced exclusively at the region of elongation.
Which plant hormone is responsible for saving the crops from falling.- a)Cytokinin
- b)Gybberellin
- c)Auxin
- d)Ethylene
Correct answer is option 'C'. Can you explain this answer?
Which plant hormone is responsible for saving the crops from falling.
a)
Cytokinin
b)
Gybberellin
c)
Auxin
d)
Ethylene
| | Knowledge Hub answered |
Auxin is a plant hormone that plays a crucial role in various aspects of plant growth and development, including preventing the abscission or shedding of leaves, flowers, and fruits. It helps in maintaining the attachment of these structures to the plant, thereby saving the crops from falling off prematurely.
While the other hormones mentioned in the options also have important roles in plant physiology, auxin specifically helps in preventing the loss of crops by promoting cell elongation, which aids in keeping the plant parts firmly attached.
Which plant hormone is formed in injured cells by which the injury of plant is healed?- a)Florigens
- b)Traumatic
- c)Abscisic Acid
- d)None of the above
Correct answer is option 'D'. Can you explain this answer?
Which plant hormone is formed in injured cells by which the injury of plant is healed?
a)
Florigens
b)
Traumatic
c)
Abscisic Acid
d)
None of the above
| | Knowledge Hub answered |
The correct answer is D: None of the above.
The plant hormone that is formed in injured cells to aid in the healing process is called auxin. Auxin is responsible for promoting cell division and elongation, which helps in the regeneration of damaged tissues and the formation of new roots. It plays a crucial role in wound healing and is synthesized in the meristem tissues near the injured area.
Which plant hormone is helpful in making RNA and protein?- a)Gibberellins
- b)Auxin
- c)Cytokinins
- d)Ethylene
Correct answer is option 'C'. Can you explain this answer?
Which plant hormone is helpful in making RNA and protein?
a)
Gibberellins
b)
Auxin
c)
Cytokinins
d)
Ethylene
| | Knowledge Hub answered |
Cytokinins are involved in cell division and differentiation in plants. They promote cell division and play a crucial role in regulating the growth and development of plant tissues. Cytokinins stimulate the synthesis of RNA and proteins, which are essential for cell division and growth. By promoting these processes, cytokinins contribute to the overall growth and development of plants.
Name the plant hormone which is responsible for the ripening of fruits?- a)Ethylene
- b)Auxin
- c)Traumatic
- d)Cytokinins
Correct answer is option 'A'. Can you explain this answer?
Name the plant hormone which is responsible for the ripening of fruits?
a)
Ethylene
b)
Auxin
c)
Traumatic
d)
Cytokinins
| | Knowledge Hub answered |
Ethylene is the plant hormone responsible for the ripening of fruits. It is a gaseous hormone that is naturally produced by plants during various stages of their development, including fruit ripening. Ethylene acts as a signal to initiate and accelerate the ripening process in fruits by triggering changes in color, texture, aroma, and taste.
During fruit ripening, ethylene promotes the breakdown of chlorophyll, which leads to changes in pigmentation. It also stimulates the production of enzymes that break down complex carbohydrates into simpler sugars, resulting in the sweetening of fruits. Additionally, ethylene affects the softening of fruit tissues by breaking down cell walls and pectins, leading to a softer and juicier texture.
While auxin, cytokinins, and other plant hormones have important roles in various aspects of plant growth and development, ethylene is specifically associated with fruit ripening.
Which plant hormone helps in breaking the dormancy of plant?- a)Auxin
- b)Gibberellin
- c)Cytokinin
- d)Ethylene
Correct answer is option 'B'. Can you explain this answer?
Which plant hormone helps in breaking the dormancy of plant?
a)
Auxin
b)
Gibberellin
c)
Cytokinin
d)
Ethylene
| | Knowledge Hub answered |
The correct answer is B: Gibberellin.
Gibberellins are plant hormones that play a key role in breaking seed dormancy and promoting seed germination. They stimulate various physiological processes in plants, including stem elongation, leaf expansion, and flowering. In the context of seed dormancy, gibberellins are responsible for initiating the growth of the embryo and promoting the synthesis of enzymes that break down stored nutrients in the seed, allowing it to sprout and begin its growth cycle.
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