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Unicellular Vs. Multicellular Organisms
Unicellular Organisms: Made of only ONE cell Examples: Bacteria and Ameoba Generally classified as Prokaryotes Smaller and less complex than multicellular organisms Carry out all seven life processes: 1) Feeding - feed on smaller organisms by forming a food vacuolue (Storage space) that engulfs the food. 2) Respiration- In the mitochondria. The food, once in the organism, is digested. 3) Movement - Move using flagella (tiny hairs sticking out of the bacteria) - outside factors, such as water currents and wind, carry them from place to place. 4) Excretion - The food digested goes out as waste product 5) Reproduction - Asexual reproduction - the cell itself splits in half Binary Fission - Parent cell splits into two producing two independent daughter cells (same genetics as parent cell) 6) Sensitivity - Adapt to their surroundings (environment) 7) Growth - Some unicellular organisms that do not have flagella or a tail to aid in their movement, they grow out a ''false leg''. This false leg just kind of juts out of them and guides them to wherever they want to go, then it goes back into wherever it came from.
Multi Cellular Organisms: Made of more than one cell (MULTI - like multi color- like a RAINBOW!) Examples: Humans (YES, you are a multicellular organism) , Plants, etc. Generally classified as Eukaryotes More complex than Unicellular organisms Carry out seven life processes: 1) Feeding - Two Categorie: Hetrotrophs -cannot produce their own food and so they CONSUME it..... veggies, meat, etc. Autotrophs - have the ability to produce their own food, such as green plants that can produce their own food through PHOTOSYNTHESIS 2) Respiration - In the mitochondria. There are two types of respiration: Aerobic (Requires oxygen) Anaerobic (Does not require oxygen) 3) Movement - Humans/Animals move their whole bodies... we move our arms, legs, head, eyes, tongue, etc. (BASICALLY WE CAN MOVE OUR WHOLE BODIES - head 2 toe) Plants move towards sunlight Phototropism --> photo explains everything Tendrils move in the air until they touch a solid to which they climb on... like IVY covering a house --> Photo example given 4) Excretion - Go to the bathroom and find out. [Urinary System] 5) Reproduction - Uusally it is sexual reproduction (Requires parents - sex cell fusion : gametes fuse -sperm and egg- to form zygote) *Note: Zygote = we ALL were zygotes when we first developed in our mothers 6) Sensitivity - Using out 5 senses (Sight,, Sound, Touch, Taste, and Smell) Ex: When you smell an onion, your eyes start to water. 7) Growth - Humans grow until a specific age Plants grow FOREVER (until they die)
More on unicelluar organisms! <--
IVY climbing
Phototropism
MULTI! :D
