TROPISM IN PLANTS.pptx

TROPISM IN PLANTS

1. TROPISM IN PLANTS BY MOHANAPRIYA. D 21-EDB-06

2. INTRODUCTION P lants do not move on their own from one place to another, but they can move their body parts for getting sunlight ,water & nutrients. They are sensitive to external factors like light, gravity, temperature & etc.

3. TYPES OF PLANTS MOVEMENTS TROPIC MOVEMENT NASTIC MOVEMENT Tropism is a undirectional movement of a whole or part of a plant towards the direction of stimuli. Nastic movements are non directional response of a plant or part of a plant to stimulus.

4. TYPES OF TROPISM PHOTOTROPISM GEOTROPISM HYDROTROPISM THIGMOTROPISM CHEMOTROPISM THERMOTROPISM

5. Phototropism in plants The movement caused by stimulus of light is called “photo tropism” Example: the flower bwnd to the direct ion of sun light.

6. GEOTROPISM IN PLANTS The movement that follows earth gravitational force is called “geotropism”. POSTIVE GEOTROPISM NEGATIVE GEOTROPISM

7. CHEMOTROPISM IN PLANTS The movement that is caused by chemical substances stimulus.

8. THIGMOTROPISM IN PLANTS The movement that is caused by stimulus of touch to the harder thing.

9. HYDROTROPISM IN PLANTS The movement of the plant root that is influenced by reservation of soil water.

10. THERMOTROPISM IN PLANTS Plants or a part of the palant responds to the changing atmospheric temperature.