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प्रश्न
The growth of pollen tubes towards ovules is due to
पर्याय
hydrotropism
chemotropism
geotropism
phototropism
उत्तर
chemotropism
Explanation -
The stigma of the flower releases a chemical which guides the pollen tube through style towards the ovule. Here the movement occurs in response to a chemical. Such a type of movement is called chemotropism.
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संबंधित प्रश्न
Where is the auxin hormone made in a plant stem?
Distinguish between tropic movements and nastic movements in plants. Give examples to illustrate your answer.
To which directional stimuli do roots respond?
Name the plant organ which is negatively geotropic.
Define phototropism. Give one example of phototropism.
What are tropic movements? Briefly explain various types of tropic movements in plants.
The shoot system grows upward in response to ______.
Write the scientific terms used to represent the following:
Bending of roots towards the water.
Arrange and rewrite the terms in the group in the correct order so as to be in a logical sequence, beginning with the term that is underlined.
Apical meristem, Positive phototropism, Auxins, Cell elongation.
Study the diagrams given below and answer the following questions:
- Name the structures shown as X and Y in the figures (A) and (B), respectively.
- Write the functions performed by the structures X and Y.
- Name the phenomenon depicted and define it.
- How do the structures X and Y differ from each other?
- Give examples of the plants which show the said phenomenon.
