What is a plant hormone ? Name four plant hormone . State one function of each .?

Question

Answer

Plant hormones :-
These chemical substances are naturally produced in plants.They are capable of regulating their important processes . Different plant hormones help to coordinate growth , development and responses to the environmenent .
Major classes of plant hormones and their effects :-
1) Auxin :- are usually synthesised in the tip of shoots . It helps them to grow longer when plants are placed facing a light source , they Shi bending towards it .
2) Gibberellins :- the hormones that help in the growth of the stem and flower .
3( Cytokinis :- are the hormones , which promote cell division . Highest concentration of cytokinis occurs in fruit and seeds , i. e , areas of rapid cell division.
4( Abscisic acid :- is a group inhabitor .
- It is responsible for the wilting of leaves .

Answer

Plant Hormone --- Any of various hormones produced by plants that control or regulate germination, growth, metabolism, or other physiological activities.

Plant hormones are divided into five categories:
1. Auxins --- The primary function of the auxin hormones is to elongate plant cells in the stem.
2. Cytokinins --- The cytokinin hormones promote cell division and tissue growth, and depend upon the presence of auxins to determine the extent of their activity.
3. Gibberellins --- Gibberellins stimulate growth, especially elongation of the stem, and can also end the dormancy period of seeds and buds by encouraging germination.
4. Inhibitors --- True to their name, inhibitors restrain growth and maintain the period of dormancy in seeds and buds.
5. Ethylene --- Ethylene is best known for controlling the ripening of fruits.

Answer

Plant hormone are organic chemical that help biological processes and are secreted by special cell they are also called phytohormone they are 5 in number auxin help in growth movement gibberellins are of 125 . they help to increase size of fruit cytokinin delays ageing of plant abscisic acid induce dormonancy of seeds and buds and also inhibit the growth of plant in unfavorable condition

Answer

Plant hormones are the chemical substances present in plant which bring about control and coordination of various activity in them. Plant Hormone is also called Phytohormone.
Four types of hormone are -----
• Auxin -- Help in promoting growth of the plant tissue , responsible for phototrophism ,higher activity of auxin causes Apical dominance ,etc.
• Gibberillin -- Promote parthenocarpy i.e formation of seedless fruit without fertilisation , promote breaking of dormancy , promote increase in fruit size.
• Cytokynin -- Help in stomatal opening, influence cell division which promote growth, promote expansion of cotyledon, involve in the enlargement of stem cells.
• Abscisc Acid -- Help in closing of stomata, promoting bud dormancy.

Answer

What is this

Answer

What is a plant hormone?

Plant hormones, also known as phytohormones, are chemical substances produced naturally in plants that regulate various physiological processes. These hormones play a crucial role in plant growth, development, and response to environmental stimuli. They are synthesized in one part of the plant and transported to target cells or tissues, where they elicit specific responses.

Name four plant hormones:

1. Auxins
2. Gibberellins
3. Cytokinins
4. Abscisic Acid

Functions of each plant hormone:

1. Auxins: Auxins are primarily responsible for cell elongation, root development, and apical dominance in plants. They promote cell growth by loosening the cell walls and stimulating the uptake of water. Auxins also help in phototropism (bending towards light) and gravitropism (response to gravity) in plants.

2. Gibberellins: Gibberellins regulate various aspects of plant growth and development, including stem elongation, seed germination, and flowering. They promote stem elongation by stimulating cell division and elongation. Gibberellins also break seed dormancy and promote seed germination. Additionally, they play a role in fruit development and ripening.

3. Cytokinins: Cytokinins are involved in cell division and differentiation in plants. They promote cell division in the growing regions of a plant, such as shoot tips and root tips. Cytokinins also influence the development of lateral buds, delay senescence (aging) of leaves, and enhance nutrient transport in plants.

4. Abscisic Acid: Abscisic acid (ABA) is responsible for regulating plant responses to environmental stresses, such as drought, cold, and salinity. It inhibits plant growth by closing stomata, reducing transpiration, and promoting the accumulation of storage compounds. ABA also plays a role in seed dormancy and inhibits seed germination under unfavorable conditions.

Conclusion:

Plant hormones are essential for the growth, development, and adaptation of plants to their surroundings. They regulate various processes, including cell elongation, stem elongation, cell division, seed germination, and stress responses. Understanding the functions of plant hormones helps in manipulating plant growth and development for agricultural purposes and improving plant tolerance to adverse conditions.

Similar Class 10 Doubts

Name one plant hormone which is responsible for growth

Name four plant hormones and write functions of any one.?

Name the plant hormone that inhabits growth and also help in wilting of leaves ?

Name the Hormone secreted by thyroid Write its function?

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