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WEEK 9
SUBJECT: BIOLOGY
CLASS: SS1
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 the 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.
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