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Biology definitions
Term | Definition | null |
---|---|---|
Cell | Smallest working unit in a living organism | |
System | A group of organs working together | |
Digest | To break down large particles into smaller particles | |
Enzyme | A protein that speeds up chemical reactions e.g amylase-starch | |
Peristalsis | Muscular movement, in the digestive system, used to push food along | |
Sexual Reproduction | Involved two parents where the male and female gametes fuse together to from a zygote | |
Fertilisation | When the nucleus of the sperm joins with the nucleus of the egg to form a zygote | |
Menstrual Cycle | The monthly series of changes a women’s body goes through in preparation for a potential pregnancy. | |
Pulse | A vibration in an artery due to the beat of the heart | |
Cellular Respiration / Respiration | The release of energy from food | |
External Respiration | The way organisms take in oxygen for respiration and get rid of carbon dioxide and water vapour. | |
Diffusion/Gaseous Exchange | When oxygen passes through the walls of the alveoli into the blood in capillaries and carbon dioxide passes from the blood through the walls of the capillaries into the alveoli to be released in respiration. | |
Energy | The ability to do work | |
Work | Done when the body is moving. | |
Aerobic Respiration | The release of energy from food when oxygen is in the reaction. | |
Anaerobic Respiration | The release of energy from food when oxygen is not in the reaction. | |
Photosynthesis | The way plants make their own food using light | |
Health | A state of complete physical, mental and social well-being | |
Hormones | Proteins that bring about responses in the body | |
Nutrition | Concerned with how an organism fetus it’s food and what type of food it gets | |
Deficiency Diseases | Diseases caused by the lack of a particular food e.g Scurvy - Vit C | |
Microorganisms | Very tiny living organisms that usually can only be seen using a microscope e.g bacteria | |
Vaccinations | When a harmless version of a disease is introduced into a person in order to stimulate the production of anti-bodies and white blood cells against the disease | |
Pathogens | Microorganisms that cause disease | |
Mutualism | When two organisms live in close association and both benefit from this arrangement | |
Probiotics | Living organisms that improve human heath | |
Asexual Reproduction | Involves one parent with the offspring having identical genetic information to the parent e.g Strawberries | |
Variation | The way members of the same species differ | |
Mutation | Changes in the DNA that cause variation in members of the same species | |
Species | A group of organisms that can breed with each other to from fertile offspring | |
Fertile | That an organism is capable of producing offspring | |
DNA | DeoxyriboNucleic Acid | |
Chromosomes | Made up of lengths of DNA wrapped around proteins | |
Genes | Lengths of DNA along a chromosome. Each gene controls the making of a parity all protein | |
Inheritance | The way traits are passed from parent to offspring | |
Expressed (Genes) | When the protein a gene is control is actually made | |
Genotype | Genetic makeup of an individual | |
Phenotype | Physical makeup of an individual | |
Dominant (Gene) | A gene that prevents another gene from working | |
Recessive (Gene) | A gene that is precedent from being expressed | |
Biodiversity | All the different species of living organisms on Earth | |
Evolution | The gradual changes that occur in species over many generations | |
Extinction | Means that a particular species no longer exists e.g the dodo bird | |
Ecology | The branch of biology that deals with the relationships of organisms to one another and their physical surroundings | |
Habitat | The natural environment where and organism lives e.g Grassland | |
Community | All the animals and plants that live in a particular area (habitat) and share the resources in this area | |
Ecological Niche | And organisms role in its community, how it fits in and Interacts with other organisms. | |
Abiotic Factors | The non living factors that affect organisms in their habitats e.g air temp, light intensity | |
Producers | Green plants that are able to make their own food through photosynthesis | |
Consumers | Organisms that feed on other organisms for their food | |
Decomposers | Organism that break down dead plants and animals into materials that go back into the soil | |
Adaption | The way an organism is suited to survive in its environment | |
Competitions (In habitats) | The interaction between members of the same species or members of different species for resources that are in short supply of limited. | |
Interdependence | The way one thing relies on another | |
Food Chain | Shows the way energy is passed from one organism to another | |
Food Web | Shows a number of interconnecting food chains | |
Frequency (in a habitat) | The particular chance of finding a particular organism in one throw of a quadrat | |
Ecosystem | A community of organisms that interact with each other and are affected by the abiotic, biotic, climatic and edaphic factors surrounding them | |
Population (of organisms) | Is made up of members of the same species | |
Tropic level | The position an organism occupies on the food chain | |
Energy Pyramid | Shows the relationship between producers, primary, secondary and tertiary consumers | |
Ecological Biodiversity | The different types of ecosystems on earth e.g terrestrial, aquatic | |
Conservation | The wise management of a natural resource to prevent exploitation, destruction or neglect | |
Fertile Period | (12-17) time during cycle when women’s most likely to get pregnant |