Presentation on theme: "1C1 Living things OB41 identify the basic processes and characteristics common to all living organisms: nutrition, respiration, excretion, growth, reproduction,"— Presentation transcript:
11C1 Living thingsOB41 identify the basic processes and characteristics common to all living organisms: nutrition, respiration, excretion, growth, reproduction, movement and responseOB42 recall that living things are composed of cells, tissues, organs and systems, and understand that growth results from cell division
2Every single living organism carries out the same basic processes – different organisms just carry them out in different ways….
3Characteristics of Life nutritionrespirationexcretiongrowthreproductionmovementSensitivityand
4Nutrition means obtaining food All living organisms need food as a source of energyPlants can make their own food using energy from the sun (photosynthesis) – they are PRIMARY PRODUCERSAnimals need to find an external source of food
5Respiration means glucose cell oxygen releasing energy from food Glucose in the food is broken down inside cells, and energy is releasedMost organisms use oxygen for this process – so it is called aerobic respirationglucoseoxygencellenergywatercarbon dioxide
6Excretion means the removal of toxic chemical substances toxic substances are poisonous andmay harm cells if not removedexamples of toxic substances arecarbon dioxide and ureaNH3
7Growth meansthe organism develops into an adult all growth is by CELL DIVISIONFor micro-organisms, this means their cell grows to full size before reproducingFor multi-celled organisms, this means that cells divide, organs grow in size, and systems develop maturity
8Reproduction means producing more organisms of the species Scientists have a name for the “children” of all living organisms – they say OFFSPRINGReproduction meansproducing more organisms of the speciesSome organisms reproduce from one parent only – this is called ASEXUAL reproductionOther organisms reproduce by combining one cell from a male with one cell from a female – this is called SEXUAL reproduction
9Movement means the ability of an organism to change position Some organisms can move the entire bodyeg single-celled organismsSome organisms can move part of the bodyeg plantsSome organisms can move both their entire body, and each section of the body eg insects, amphibians, reptiles, mammalsMost organisms move towards things they need and away from things that harm them
10Sensitivity means the ability of an organism to gather information and respond to it (Response) Some of the things that cause living organisms to respond are light, sound, touch, chemicals, gravity…eg:Roots grow downwards in response to gravity, shoots grow towards lightBoth plants and animals use their sense of touch when climbingPredators use sound and smell to hunt for prey
11Mrs Gren nutrition respiration excretion growth reproduction movement sensitivityand
17H/WDraw a cell with labels on a piece of paper the best ones go on the wall
18Differences between Plant and Animal cells Plants have cell walls-to hold them upPlants have CHLOROPLASTS-to make energy by photosynthesisPlants have large vacuoles and animal cells have small vacuoles
19CellsSome living things are composed of just a single cell eg bacteriaSome living things are composed of a small number of simple and similar cells eg fungiSome living things are composed of very many cells, with many different structures and functions eg humansnerve cellmuscle cellsblood cellsbone cells
20Tissues Cells that have the same structure and function form tissues… Cells in tissues are usually joined togetherAnimal tissues include muscle, bone and nerves for movementPlant tissues include xylem and phloem for transportphloemxylem
21OrgansTissues can be organised into groups to form organs, each organ has a particular functionPlant organs include the ROOT for absorbing water, LEAF for photosynthesisAnimal organs include the HEART for pumping blood, LUNGS for gas exchange
22Systemsorgans, tissues and cells can be organised into systems that carry out major functions in the organism eg:Reproductive system, Nervous system, Digestive System, Circulatory system…
23If living organisms are composed of cells, what do they need in order to grow bigger? … …MORE CELLS !!
25What do you think?Most animals move about while most plants tend to “stay put” – why?Can you suggest one advantage and one disadvantage of being single-celled?Animals have highly developed nervous systems compared to plants – why?A lot of plants have to use the help or wind or insects for reproduction – why?
26Living thingsThe basic processes and characteristics common to all living organisms: nutrition, respiration, excretion, growth, reproduction, movement and response (MRS GREN)Recall that living things are composed of cells, tissues, organs and systems, and understand that growth results from cell division