l1 b1 biology gcse
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What is the odd one out and why?
B1. Characteristics of living organisms
Lesson Objective:1. List and describe the characteristics of living organisms.
What do you think you have in common with people of your age who live in the USA?
What do you think you have in common with an animal like a lion?
What do you think you have in common with a plant?
What do you think you have in common with bacteria?
Features of all living things are movement, respiration, sensing, growth, reproduction, excretion, and nutrition.
Characteristics of living organisms
- Respire- Irritability (Sensitivity)- Nourish- Grow and develop- Excrete- Reproduce
RINGER
Respiration
- Organisms use oxygen and nutrients to release energy
- Oxygen is generally gained from the environment and taken in by gaseous exchange systems
Irritability
• Organisms can detect changes to their environment
• If conditions are extreme organisms will have to move (or die)
Nutrition
• Organisms must take in food providing energy or materials for growth
• Plants use photosynthesis to make their own food
Growth
• Growth is a permanent increase in size and dry mass
• Organisms generally grow as time goes on
Excretion
• Removal of toxic waste from organisms
Reproduction
• Sexual – fertilization to produce a new organism
• Asexual – organism splits in two and produces two identical organisms
Questions
1. When did the first living organism appear on earth?
2. RINGER stands for what? 3. Give two reasons why reproduction is so
important for living organisms.