Interactions with
the Environment
and between the
Organisms
UNIT-1
Key concept
Relationships
Related conceptInteraction
Interaction
1. What is interaction?
2. How this interaction is related to relationships?
3. What will be Global context of interaction?
Interactions is an effect that things have on each other.
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Living organisms
Systems within organisms
Non-living objects
Chemical substances
When two or more individual interact , they form relationships that ,
over time, impact and contribute to their identity.
( Statement of Inquiry )
Global context: Identity and Relationship
Main focus of this Unit
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Interactions between the animals.
Interactions between animals involves responses.
Most of the responses are mediated by NERVOUS SYSTEM.
How sensory information is processed and how decisions are made that
lead to a response?
★ Types of relationships between two species.
In what ways do organisms respond
to changes in their surroundings?
When you touching somethings hot,you pull your
hand away.
Stimulus: Heat
Response:pull away
STIMULUS
 Any internal or external change that
cause a RESPONSE .
RESPONSE
 Activity of the body due to the
stimulus.
REFLEX ACTION
A response to a stimulus that occurs without the
need for conscious thought is called a reflex action.
Your body has an internal
system in place that can sense
and respond to the changes in
your environment.
Nervous system
Your nervous system is the main communication centre of
your body. It receives, processes and responds to stimuli
you get from your environment.
It is involved in controlling all of your body movements,
like the muscles in your legs when you are walking, and also
controls all the other important systems in your body like
your heartbeat, breathing and digesting.