1. Phototaxis is movement in response to direction and intensity of light.
• Free-swimming algae such as Chlamydomonas usually tend to concentrate where light intensity is optimum and will respond to light by swimming towards it. This is an example of phototactic response.
2. Osmotaxis is movement in response to changes in osmotic conditions e.g. freshwater amoeba.
Survival Value
• Ensures favourable conditions for existence.
3. Chemotaxis is movement in response to concentration of chemical substances.
Wilfykil answered the question on February 28, 2019 at 11:51
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