The bending of the shoot of a plant in response to light is called: (a) geotropism (b) phototropism (c) thigmotropism (d) photonasty

Academic Biology NCERT Class 10

(b) phototropism.

In the term phototropism, Photo means light and tropism means movement. The turning or bending of plant shoots in response to light is called phototropism.

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Updated on: 23-Mar-2023

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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
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
What is the stimulus in : (a) phototropism ? (b) geotropism ? (c) chemotropism ? (d) hydrotropism ? (e) thigmotropism ?
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 ______.
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
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
The movement of sunflower in accordance with the path of the sun is due to:(a) photonasty (b) phototropism (c) hydrotropism (d) chemotropism
The stimulus in the process of thigmotropism is:(a) touch (b) gravity (c) light (d) chemical
(a) Define phototropism. Give one example of phototropism.(b) How does phototropism occur in a plant stem (or shoot)? Explain with the help of labelled diagrams.(c) What is meant by positive phototropism and negative phototropism? Give one example of each type.
(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.
Give the scientific terms used to represent the following :(a) Bending of a shoot towards light.(b) Growing of roots towards the earth.(c) Growth of a pollen tube towards ovule.(d) Bending of roots towards water.(e) Winding of tendril around a support.
The plant part which exhibits negative geotropism is:(a) root (b) stem (c) branch (d) leaves
Bouncing back of light from shining surfaces is called bending?
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?
Name the plant hormones which are responsible for the following effects :(a) falling of leaves (b) opening of stomata(c) bending of stem towards light (d) closing of stomata

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