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Living things
| Term | Definition |
|---|---|
| The variety of life. | • All living things are divided into two main groups. Plants & Animals. |
| Diversity of Animals | • The animal kingdom is divided into groups called classes. Reptiles, Birds, Mammals • These all have similar features which distinguish them from other classes. |
| Metabolism | Metabolism is the sum of all the chemical reactions that occur in living organisms |
| These chemical reactions are responsible for: | • Growth • Repair • Responsiveness • Reproduction • Excretion |
| Anabolic Reactions | • These reactions use energy to join small molecules together & form large molecules. • E.g: Photosynthesis |
| Catabolic Reactions | • Use energy to break apart large molecules into smaller molecules. • E.g. Respiration |
| Continuity of Life | Continuity of Life is the ability of an organism to exist from one generation to the next |
| The characteristics of living things | • In order for an organism to be considered a living thing it must have the following characteristics… 1. Biological Organisation 2. Nutrition 3. Excretion 4. Response 5. Reproduction |
| Biological Organisation | Cell ➡ Tissue ➡Organ➡ Organ system➡ Organism |
| Nutrition | •The Sun is the basic source of energy for all nutrition. • Plants use the sunlight to make food. This is a process known as Photosynthesis • Energy is passed through the food chain & used up in the process of cellular respiration. |
| Types of nutrition | Autotrophic and Heterotrophic |
| Autotrophic | • An organism that makes their own food. E.g. Plants, Algae & Bacteria |
| Heterotrophic | • Obtains food from other living organism. E.g. carnivores, herbivores etc |
| Excretion | • Waste products in the body must be excreted before they build up & become toxic. •Removal of waste products of metabolism from the body. •Bacteria remove waste in a process known as diffusion. |
| Diffusion | Is the movement of particles from areas of high concentration to areas of low concentration |
| Response | • Living things have tobrespond in order to react to changes (stimuli) in their environment. •The way organisms react to their environment |
| Reproduction: sexual | • Occurs in most animals and plants • Produce offspring from two parents. • Produces variation within species |
| Reproduction Asexual | • Produces identical offspring from one parent. • No variation • Bacteria & single celled organisms (Protista) use this method. |
| Life | Describes an organic based object that possesses the characteristics of metabolism & continuity of life. |
Created by:
Caoimhek
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