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प्रश्न
The growth of pollen tubes towards ovules is due to
विकल्प
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.
APPEARS IN
संबंधित प्रश्न
How is the movement of leaves of the sensitive plant different from the movement of a shoot towards light?
Give the scientific terms used to represent the Growing of roots towards the earth.
Distinguish between tropic movements and nastic movements in plants. Give examples to illustrate your answer.
Why is the closing of a dandelion flower at dusk (when it gets dark) not a tropism?
Name one plant part which exhibits positive thigmotropism.
There are three plants A, B and C. The flowers of plant A open their petals in bright light during the day but close them when it gets dark at night. On the other hand, the flowers of plant B open their petals at night but close them during the day when there is bright light. The leaves of plant C fold up and droop when touched with fingers or any other solid object.
- Name the phenomenon shown by the flowers of (i) plant A and (ii) plant B.
- Name one flower each which behaves like the flower of (i) plant A and (ii) plant B.
- Name the phenomenon exhibited by the leaves of plant C.
- Name a plant whose leaves behave like those of plant C.
- Which plant/plants exhibit the phenomenon based on growth movements?
State whether true or false. If false, correct the statement.
The response of a part of plant to the chemical stimulus is called phototropism.
Where are auxins synthesized in a plant? Which organ of the plant shows:
- Positive phototropism
- Negative geotropism
- Positive hydrotropism
Name the following:
The tropic movement of plant parts in response to chemicals.
______ of sweet peas exhibit thigmotropism.
