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Question

Briefly discuss about the significance of the following movement for the plant. a. Positive phototrophic movement b. Positive thigmotrophic movement c. Positive hydrotropic movement d. Negative geotropic movement e. Positive geotropic movement

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Solution

Positive phototropism:-The flower-stalks of this plant initially show positive phototropism until they have produced flowers.

Negative phototropism:- After fertilisation the stalks curl up and eventually bury the developing pods under the soil, thus showing negative phototropism.

Positive geotropism:-Primary roots and certain other portions of the root system tend to grow directly toward the centre of gravity.

Negative geotropism:-Stem mostly grows away from the centre of gravity and is thus negatively geotropic.

Positive hydrotropic movement-The roots show positive hydrotropic response, i.e., they bend towards the water



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