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प्रश्न
Differentiate between:
Stimulus and response
उत्तर
| Stimulus | Response | ||
| 1. | It comprises. of actions that cause a reaction. All living organisms respond to stimuli. | 1. | It comprises the reaction observed. after an action is performed. |
| 2. | For example, light is a stimulus received by plants. | 2. | For example: On receiving light plants show phototropism that is bent towards the light. |
संबंधित प्रश्न
How does chemical coordination occur in plants?
What is the general name of chemical substances which bring about control and coordination in plants?
Which of the following hormones regulate stomatal colour?
Answer the following question.
What are plant hormones? Name the plant hormones responsible for the following:
- Growth of stem
- Promotion of cell division
- Inhibition of growth
- Elongation of cells
Why is ABA known as antitranspirant?
Match the column A with B
| A | B | |
| i. | Epinasty of flower | GA3 |
| ii. | Natural auxin | NAA |
| iii. | Flowering in Litchi | IAA |
| iv. | Bolting of Beet | Ethylene |
A gardener wants to give bushy appearance to plants in our college campus.
- What should he do to achieve the same?
- Which property of phytohormones he must be aware of?
Match the following lists and select the correct option.
| List I | List II | ||
| i. | 2,4-D | a. | Promotes senescence and ripening of fruits |
| ii. | ABA | b. | DelaysJeaf senescence |
| iii. | Gibberellins | c. | Increases the length of the sugarcane stem |
| iv. | Ethylene | d. | Kills dicotyledonous weeds without affecting mature monocotyledonous plants |
| e. | Stimulates the closure of stomata |
The only phytohormone which is a gas at ordinary temperature:
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. |
