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प्रश्न
Conversion of nitrates to nitrogen is called ______.
विकल्प
ammonification
nitrification
nitrogen fixation
denitrification
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उत्तर
Conversion of nitrates to nitrogen is called denitrification.
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संबंधित प्रश्न
What is the general name of chemical substances which bring about control and coordination in plants?
Which of the following is not a plant hormone?
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 |
Name the following:
Growth-retarding hormone in plants.
Very Short Answer Question:
Which is the plant stress hormone?
In which part of plant does auxin synthesis occur?
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 |
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.
