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Growth Related Movement in Plant

A researcher ...

Question

A researcher performed an experiment to study the effect of a particular plant hormone ‘H’ on plant growth.

Identify the plant hormone ‘H’ based on the results obtained as shown in the above figure.

A

Auxin

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B

Gibberellin

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C

Cytokinin

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D

Abscisic acid

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Solution

The correct option is B Gibberellin
Gibberellin induces internodal elongation in all types of plants including genetically dwarf plants. It also causes elongation of stems in plants with rosette habits. So, the given phytohormone H is Gibberellin.

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Q. While conducting an experiment on plant hormones a student found that on using a particular hormone abscission of leaves, senescence, cell division and growth was observed. Which hormone do you think was used on the plants?

Q. Name the plant hormone that inhibits plant growth. Give an example of its effect on the plant.

The following experiment was performed to test the effect of auxin on plant growth: Study and answer question.

The auxin was dissolved in a gelatin block; gelatin does not affect the biological activity of the auxin. Several plant seedlings were prepared in a gelatin block; gelatin does not affect the biological, activity of the auxin. Several plant seedlings were prepared as described above and growth was measured every 5 days.

Based on the results of the experiment, one can conclude that the tip of the plant contains ....................

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