What is the stimulus in : (a) phototropism ? (b) geotropism ? (c) chemotropism ? (d) hydrotropism ? (e) thigmotropism ?

Academic Biology NCERT Class 10

The stimulus in-

(a) Phototropism: Light

(b) Geotropism: Gravity

(c) Chemotropism: Chemicals

(d) Hydrotropism: Water

(e) Thigmotropism: Touch

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Updated on: 24-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
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
The bending of the shoot of a plant in response to light is called: (a) geotropism (b) phototropism (c) thigmotropism (d) photonasty
The movement of sunflower in accordance with the path of the sun is due to:(a) photonasty (b) phototropism (c) hydrotropism (d) chemotropism
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 stimulus in the process of thigmotropism is:(a) touch (b) gravity (c) light (d) chemical
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 growth of a pollen tube towards the ovule caused by a sugary substance as stimulus is an example of: (a) phototropism (b) chlorotropism (c) gravitropism (d) chemotropism
Which of the following acts as a stimulus in the process of hydrotropism?(a) hydrocarbon (b) hydrogen oxide (c) hydrogen chloride (d) hydrogen peroxide
(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 plant part which exhibits negative geotropism is:(a) root (b) stem (c) branch (d) leaves
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?
(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.
What is a plantlet? Define the stimulus.
Write the property: $( \frac{a}{b}+\frac{c}{d})+\frac{e}{f}=\frac{a}{b}+( \frac{c}{d}+\frac{e}{f})$.

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