AIM: What are the characteristics of a squid? (Squid dissection)
Aim: What are the characteristics of living things? Topic: Conditions for life.
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Transcript of Aim: What are the characteristics of living things? Topic: Conditions for life.
Aim: What are the characteristics of living things?
Topic: Conditions for life
What is BIOLOGY?
- the study of life.
What is an ORGANISM?
- any living thing.
What is an Environment?
- the surroundings of an organism which affects how it lives.
What do all organisms need to survive?
CONDITIONS/FACTORS FOR LIFE:CONDITIONS/FACTORS FOR LIFE:
1. SOURCE OF ENERGY
- needed for life processes.
- light, FOOD
**The SUNSUN is the origin of almost all the energy available to all living things.
2.2. WATERWATER
- water makes up more than 65% of all organisms.
- it dissolves & carries materials throughout an org.
- many chemical reactions take place in water.
- helps keep an organisms temperature stable.
3. GASES- found in the environment.- needed to perform life processes.- oxygen (O2), carbon dioxide (CO2) &
nitrogen (N).4. PROPER TEMPERATURE- needed to maintain “homeostasishomeostasis” or
“dynamic equilibrium” which means to have a constant, stable internal environment.
5. PROPER HABITAT
- a place to live and find all the other factors needed for to carry out the life processes.
What are the life processes?What are the life processes?
- processes that all living things must do in order to survive. THEY ARE:
1. METABOLISM
2. RESPONSE
3. GROWTH
4. MOVEMENT
5. REPRODUCTION
What is METABOLISM??1. Metabolism = total of all the
chemical activities that occur in a living thing involving energy usage.e.g. Building substances.
Breaking down substances.- in order for these chemical
reactions to take place, organisms must take in food for energy.
What is RESPONSE??What is RESPONSE??
-a reaction to a stimulus.What is a stimulus?
-any change in the internal or external environment of an organism (temperature, weather, light, predator).
e.g. blink, leaves fall off a tree, leaves bend towards light
What is Homeostasis?
• Homeostasis is the body’s ability to maintain a constant internal environment.
• Examples include:– Maintenance of body temperature.– Maintenance of pH.– Maintenance of sugar level in the blood.– Maintenance of water level in the body.
• Failure to maintain homeostasis will result in the organism becoming sick or dying!
What is GROWTH?- building new parts for an organism
during metabolism.- an increase in cell size.- replace or repair of dying or dead
cells.- maturation
e.g. a baby getting bigger, fruit ripening
What is MOVEMENT?
- a change in position.
- a whole organism can move.
- internal organs, fluid, blood can move.
- cell parts and cells can move.
What is REPRODUCTION?
- production of a new offspring or organism.
2 types: 1) sexual – 2 parents
2) asexual – 1 parent
** NOT needed for the individual organism to survive – just the species.
Summary:
All forms of life share certain characteristics. Living things are able to move, perform complex chemical activities, grow, reproduce, and respond to stimuli.