Question

Explain the types of tropic movements
For 5 marks

Answer 1

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chemotropism The growth or movement of a plant or plant part in response to a chemical stimulus. An example is the growth of a pollen tube down the style during fertilization in response to the presence of sugars in the style.

geotropism. : a tropism (as of plant roots or shoots) in which gravity is the orienting factor : gravitropism.

the orientation of a plant or other organism in response to light, either towards the source of light ( positive phototropism ) or away from it ( negative phototropism ).

the growth or turning of plant roots towards or away from moisture.

I HOPE IT HELPS U.

Answer 2

$\huge\textbf{Tropic movements}$

Movement of plant towards stimuli is called tropic movement. It can be in the direction of the stimuli or away from the stimuli. 



$\huge\textbf{Types}$

1. PHOTOTROPISM :-

The movement of plant towards light is called phototropism. 

Ex :- Take a plant and put it near the window then you see that it's stem moves toward in the direction of light showing + ve phototropism and roots show - ve phototropism.

2. THIGMOTROPISM :-

Movement of plants toward chemicals is called thigmotropism. 

Ex :- Coiling of plants.

3. CHEMOTROPISM :- 

Movement of plants toward chemicals is called chemotropism.

Ex :- Growth of pollen tube towards ovule.

4. HYDROTROPISM :-

Movement of plants toward water is called hydrotropism.

Ex :- Growth of tomato roots in the direction of water then it's root shows + ve hydrotropism and stem shows - ve hydrotropism.

5. GEOTROPISM :- 

Movement of plants toward earth is called geotropism.

Ex :- Take a portaid plant and put it horizontally towards earth then it's root shows + ve geotropism and stem shows - ve geotropism.