The website has the complete lesson note for all the subjects in secondary school but this piece showcases the SS1 Biology Lesson Note on Cell Reactions to its Environment. You can use the website search button to filter out the subject of interest to you.
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TOPIC: PROPERTIES AND FUNCTIONS OF THE CELL – CONTINUED
CONTENT:
SUB-TOPIC 1: CELL’S REACTIONS TO ITS ENVIRONMENT
The protoplasm of plant and animal cells is irritable. It can detect and respond to changes in their environment. Any change in conditions which is enough to produce a change in the activities of an organism or its part is called a stimulus.
Types of Responses
The three responses of the cell to its environment are tactic, nastic and tropic responses.
Tactic responses (Taxism): It is a response made by a whole organism or its freely locomotive part in response to an external stimulus. Types of tactic responses are:
Nastic responses (Nastism): This is a response made by a fixed plant in response to a non-directional or diffuse stimulus. Various types of nastic responses include the following:
Tropic Responses (Tropism): This is a response made by a fixed plant part to a stimulus. The direction of movement is determined by the direction from which the stimulus originates. Various types of tropic responses include the following:
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