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Different Tropic Movements

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Question

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.

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Solution

(a) Phototropism
(b) Geotropism
(c) Chemotropism
(d) Hydrotropism
(e) Thigmotropism

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Give the scientific terms used to represent the following:

(a) Bending of a shoot towards the light.

(b) Growing roots towards the earth.

(c) The growth of a pollen tube towards ovule.

(d) Bending roots towards the water.

(e) The winding of tendril around a support.

Q. Match the pairs and explain.

'A'	'B'
1. Growth of pollen tube towards ovule 2. Growth of shoot system 3. Growth of root system 4. Growth towards water	a. Gravitropic movement b. Chemotropic movement c. Phototropic movement d. Growth-irrelevant movement e. Hydrotropic movemen

Q. 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

Q. 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 grow 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 ..........

Q. The arrow in the diagram represents a beam of light striking a triangular glass prism. On entering the glass, the beam
Figure

(a) bends towards A.
(b) bends towards B.
(c) is totally reflected back.
(d) continues without bending.

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