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

Academic Biology NCERT Class 10

(d) chemotropism.

The growth or movement of a plant or plant part in response to a chemical stimulus is known as chemotropism.

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Updated on: 23-Mar-2023

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What is the stimulus in : (a) phototropism ? (b) geotropism ? (c) chemotropism ? (d) hydrotropism ? (e) 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.
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 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
Define the terms pollination and fertilization. Draw a diagram of a pistil showing pollen tube growth into the ovule and label the following: pollen grain, male gamete, female gamete and ovary.
The movement of sunflower in accordance with the path of the sun is due to:(a) photonasty (b) phototropism (c) hydrotropism (d) chemotropism
(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.
The length of pollen tube depends on the distance between:(a) pollen grain and upper surface of stigma (b) pollen grain on upper surface of stigma and ovule (c) pollen grain in anther and upper surface of stigma (d) upper surface of stigma and lower part of style
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 meaning of pollen tube?
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
Fill in the blanks:(a) _____ is caused by a deficiency of Vitamin D.(b) Deficiency of ______ causes a disease known as beri-beri.(c) Deficiency of Vitamin C causes a disease known as ______.(d) Night blindness is caused due to deficiency of ______ in our food.
Define chemotropism. Give one example of chemotropism. State whether this example is of positive chemotropism or negative chemotropism.
The disease kala-azar is caused by a micro-organism known as:(a) Planaria (b) Leech (c) Leishmania (d) Plasmodium
The stimulus in the process of thigmotropism is:(a) touch (b) gravity (c) light (d) chemical

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