(c)Name one plant part which exhibits positive thigmotropism.

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Solution

Answer: Tendril
●The directional movement of the plant part responding to the touch of an object is called thigmotropism.

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Q. (a) What is meant by positive tropism and negative tropism? Explain with examples.
(b) Define thigmotropism. Give one example of thigmotropism.
(c) What is the difference between thigmotropism and thigmonasty? Name one plant which exhibits thigmotropism and one plant which exhibits thigmonasty. What behaviour (or responses) of these plants make you think that they exhibit thigmotropism and thigmonasty respectively?

Q. (a) Define geotropism. Give one example of geotropism.
(b) What is meant by 'positive geotropism' and 'negative geotropism? Give one example of each type. Draw a labelled diagram to illustrate your answer indicating the plant part which shows positive geotropism and the plant part which shows negative geotropism.
(c) Name one plant part which exhibits positive thigmotropism.

A potted plant is growing in a transparent glass jar. In this plant, X and Y are the two growing parts having a lot of meristematic tissue. It is observed that the part X of this plant exhibits positive geotropism but negative phototropism. On the other hand, part Y of this plant exhibits negative geotropism but positive phototropism.
(a) Name the part X of plant.
(b) Name the part Y of plant.
(c) Which part of the plant, X or Y, will exhibit positive hydrotropism?
(d) Which part of the plant, X or Y, can have tendrils on it?
(e) Which phytohormone causes the part X to exhibit negative phototropism?

Q. (c)What is the difference between thigmotropism and thigmonasty? Name one plant which exhibits thigmotropism and one plant which exhibits thigmonasty. What behaviour (or responses) of these plants make you think that they exhibit thigmotropism and thigmonasty respectively?

Is thigmotropism in touch me not plant positive or negative?

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(c)Name one plant part which exhibits positive thigmotropism.

Answer: Tendril ●The directional movement of the plant part responding to the touch of an object is called thigmotropism.

Answer: Tendril
●The directional movement of the plant part responding to the touch of an object is called thigmotropism.