Biology

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`Biology B1 Revision
Classification
Organisms were based into groups based on their characteristics (classification). •Kingdom, Phylum, Class, Order, Family, Genus, Species

KingdomMain Characteristics
AnimaliaMulticellular; heterotrophic feeders so no chlorophyll, no cell walls; complex cell structure with nucleus PlantaeMulticellular; autotrophic feeders using chlorophyll; cell walls made of cellulose; complex cell structure with nucleus Fungi Multicellular; cell walls not made of cellulose; saprophytic feeders so no chlorophyll; complex cell structure with nucleus Protoctista Mostly unicellular (a few are multicellular); complex cell structure with nucleus Prokaryotae Unicellular; simple cell structure with no nucleus

There is no kingdom for viruses because most scientists do not think they are alive •When a virus particle enters a living cell it changes the way the cell works and causes it to make copies of the virus •However the actual virus particle does not show other life processes, such as growth or feeding, live other organisms Vertebrates and invertebrates

Vertebrates are animals that have a backbone ( a series of small bones called vertebrae) and they belong to the phylum Chordata •External fertilisation is when the adult releases her eggs into the water where they are fertilised by sperm released by an adult male. •Internal fertilisation is when the adult male puts the sperm into the female so the fertilization takes place inside her body •Oviparous is when the vertebrates lay eggs

Viviparous give birth to live young, such as mammals
Homeotherms keep their body temperature constant and are often warmer than their surroundings by releasing heat form reactions in their body •Poikilotherms temperature varies with the temperature of their surroundings Species

A species is a group of organisms that can interbreed to produce fertile offspring •2 related species can produce...
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