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Question

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.


Solution

(a) Bending of shoot towards light - phototropism
(Photo = light,tropism = movement)

(b) Growing of roots towards earth - geotropism.
(This means that plant respond positively for gravitational force.)

(c) Growing of pollen tube towards ovule - chemotropism

(chemo = chemicals)

(d) :- Bending of roots towards the water - hydrotropism
(hydro =water)

(e) The winding of tendril around a support - thigmotropism.
(Tendrils are thin thread-like growths on the leaves or stems of the climbing plant. They grow towards support and wind around them.)

 


Biology
Science for Tenth Class - Part III - Biology
Standard X

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