The growth movement of a plant part in response to the touch of an object is called:(a) thigmonasty (b) hydrotropism (c) thigmotropism (d) geotropism

Academic Biology NCERT Class 10

(c) thigmotropism.

The turning or bending of a plant part in response to the touch of an object is called thigmotropism.

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Updated on: 23-Mar-2023

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The movement of a plant part in response to the force of attraction exerted by the earth is called:(a) hydrotropism (b) geotropism (c) chemotropism (d) phototropism
The bending of the shoot of a plant in response to light is called: (a) geotropism (b) phototropism (c) thigmotropism (d) photonasty
Which of the following terms denotes the movement of the root of a plant towards moisture in the soil?(a) thigmotropism (b) chemotropism (c) hydrotropism (d) geotropism
What is the stimulus in : (a) phototropism ? (b) geotropism ? (c) chemotropism ? (d) hydrotropism ? (e) thigmotropism ?
Which of the following is not caused by a growth movement?(a) bending of the shoot of a plant in response to light(b) closing up of leaves of a sensitive plant on touching with an object(c) climbing up of a plant on an object by using tendrils(d) movement of the root of a plant towards a source of water
(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.
The stimulus in the process of thigmotropism is:(a) touch (b) gravity (c) light (d) chemical
The plant part which exhibits negative geotropism is:(a) root (b) stem (c) branch (d) leaves
(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?
The movement of food in food pipe is called(a) Linear movement (b) Rectilinear movement(c) Smooth movement(d) Peristaltic movement
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?
Fill in the following blanks:(a) A plant's response to light is called _____.(b) A plant's response to gravity is called _____.(c) Plant shoot grows upward in response to _____.(d) Plant roots grows downward in response to _____.(e) Tendrils wind around a support in response to ______.(f) Plant roots grow towards ____ and in the direction of force of ______.(g) A root of a plant grows downward. This is known as _____.(h) ______ is the hormone that causes phototropism in plants.(i) The response of leaves to the sunlight is called ______.
The movement of sunflower in accordance with the path of the sun is due to:(a) photonasty (b) phototropism (c) hydrotropism (d) chemotropism
A growing seedling is kept in a dark room. A burning candle is placed near it for a few days. The top part of seedling bends towards the burning candle. This is an example of:(a) chemotropism (b) hydrotropism (c) phototropism (d) geotropism
The cut part of a plant stem(without roots) which is used in grafting is called:(a)stock (b)stump (c)scion (d)graft

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