Advertisements
Advertisements
प्रश्न
How does chemical coordination occur in plants?
उत्तर
- Chemical coordination occurs in plants with the help of plant hormones. Different plant hormones help to coordinate growth, development, and responses to the environment.
- They are synthesized at places away from where they act and diffuse to the area for action; for example, auxin promotes cell growth, gibberellins promote stem growth, cytokinins promote cell division, and abscisic acid inhibits growth, and its effects include wilting of leaves.
APPEARS IN
संबंधित प्रश्न
What is Parthenocarpy?
Match the items in column A with those of column B.
| Column A | Column B | ||
| (a) | Auxin | (i) | apical dominance |
| (b) | Gibberellin | (ii) | cell-division |
| (c) | Cytokinin | (iii) | fruit ripening |
| (d) | Ethylene | (iv) | internodal elongation |
Conversion of nitrates to nitrogen is called ______.
Multiple choice question.
How many molecules of ATP are required to fix one molecule of nitrogen?
Very Short Answer Question:
What is role of gibberellin in rosette plants?
A farmer is fed up of weeds in his Wheat farm. Which of the following chemicals he can use to overcome the problem?
Buyers often complain that a particular fruit merchant uses some chemical to ripen fruits in his shop.
Name the chemical he must be using to do so.
Name the tissue that transports hormones within the plant body?
The active ingredient of Agent Orange is an egual mixture of two phenoxy herbicides ____________.
Coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly cut coleoptile stumps.
What is the significance of the above experiment performed by Dr. F. Went?
First cytokinin was discovered by Skoog and Miller while working on tissue culture of ____________ plant.
Antidiuresis is the role of ______ hormone.
Name the plant hormones responsible for the following
- elongation of cells
- growth of stem
- promotion of cell division
- falling of senescent leaves.
Name various plant hormones. Also give their physiological effects on plant growth and development.
Name the first hormone that was discovered in plant and its precursor.
Study the diagram given below and answer the questions that follow:
- Name the phenomenon depicted by the shoot in the above diagram.
- Which plant hormone plays an important role in the above movement?
- Complete and rewrite the given statement by filling in the correct terms:
Shoots show positive ______ whereas, roots show positive ______.
Give one example of Parthenocarpy.
The response by parts of the plant towards stimulus is called as ______.
The box given below contains twelve words. Out of these, ten can be arranged in five suitable matching pairs. Make these five pairs in the form of a table.
| Auxins, Abscisic acid, Fruit ripening, Cytokinins, Closure of stomata, Parthenocarpy, Ethylene, Gibberellins, Tropism, Stem elongation, Cuscuta, Cell division. |
