Mark the odd one out:a)Auxinb)Abscisic acidc)Cytokinind)GibberellinsCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

Correct option is B as auxin , cytokinin and gibberellins are growth promoting plant hormones while Abscisic acid is the growth inhibitior plant hormone.

Answer

Option(b)becoz-----:

Abscisic acid promotes the dormancy in seeds and buds [ this is the opposite of breaking the dormancy]. It also promotes closing of stomata. Other can't do so.

Answer

Odd one out: Abscisic acid (Option B)

Explanation:
Plant hormones, also known as phytohormones, play a crucial role in the growth and development of plants. They regulate various physiological processes such as cell division, elongation, flowering, fruit ripening, and response to environmental stimuli. There are several types of plant hormones, including auxin, abscisic acid, cytokinin, and gibberellins.

1. Auxin:
- Auxin is a plant hormone that regulates various aspects of plant growth and development.
- It is involved in cell elongation, apical dominance, phototropism, gravitropism, and root initiation.
- It promotes the growth of stems, inhibits lateral bud growth, and regulates the growth of roots.
- It is synthesized in the apical meristem and transported downwards through the plant.

2. Abscisic Acid:
- Abscisic acid is a plant hormone that regulates various physiological processes, especially in response to stress conditions.
- It plays a crucial role in seed dormancy, drought tolerance, and stomatal closure.
- It inhibits cell growth, promotes leaf senescence, and regulates the closure of stomata to prevent water loss.
- Abscisic acid is synthesized in various plant tissues, including roots, leaves, and seeds.

3. Cytokinin:
- Cytokinin is a plant hormone that promotes cell division and regulates plant growth and development.
- It is involved in the regulation of shoot and root growth, leaf senescence, and delay of aging.
- Cytokinin promotes the development of lateral buds, stimulates shoot formation in tissue culture, and regulates nutrient distribution within the plant.
- It is synthesized in actively growing tissues, such as root tips and developing fruits.

4. Gibberellins:
- Gibberellins are a group of plant hormones that regulate various aspects of plant growth and development.
- They promote stem elongation, seed germination, flowering, and fruit development.
- Gibberellins are involved in the regulation of internode elongation, breaking seed dormancy, and inducing flowering.
- They are synthesized in young leaves, shoots, and developing seeds.

Conclusion:
Out of the given options, abscisic acid (Option B) is the odd one out because it functions primarily as a stress hormone, regulating responses to drought, while the other three hormones (auxin, cytokinin, and gibberellins) are involved in promoting growth and development under normal conditions.

Answer

Abscisic acid is odd one among them because rest them promotes the growth of plant but abscisic inhibit the growth of plant.

Answer

Abscisic acid (ABA) because they all break the dormancy but abscisic acid promote the dormancy.

Similar Class 10 Doubts

Artifical ripening of fruit is carried out by

The hormone that is used to keep flowers fresh is

Which of the following is not associated with growth of plant?

Which of the following impacts the growth by reversing the effects of auxin?

Small cut pieces of soft stems are placed in growth medium with following plant hormones. Which combination of plant hormones will show slowest growth ?

Top Courses for Class 10View all

Science Class 10

Social Studies (SST) Class 10

Mathematics (Maths) Class 10

English Grammar Advanced

English Grammar Basic

Top Courses for Class 10

Top Courses for Class 10

Suggested Free Tests

Related Content

About Class 10

Class 10 Study Material

Class 10 All Subjects

NCERT Textbook Solutions

Other Classes

Important Links

Company