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CHAPTER 3. BIODIVERSITY. BIODIVERSITY. Living things = organisms About 10-10000 million kinds of organisms living on earth Less than 2 million kinds have been identified Biodiversity = The wide variety of organisms on earth

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chapter 3

CHAPTER 3

BIODIVERSITY

biodiversity
BIODIVERSITY
  • Living things = organisms
  • About 10-10000 million kinds of organisms living on earth
  • Less than 2 million kinds have been identified
  • Biodiversity = The wide variety of organisms on earth
  • Different organisms have different characteristics to enable them to adapt and survive in their habitats
classification kingdom
CLASSIFICATION(kingdom)
  • Animals
  • Plants
  • Fungi
  • Bacteria
  • Very simple organisms
amphibians
AMPHIBIANS
  • Cold-blooded
  • Can live both on land & in water
  • The eggs fertilised outside the female’s body
  • Young amphibians live in water & breathe with gills
  • Adults amphibians breathe with lungs when on land
  • Adults amphibians breathe with skin when in water
  • Adults have loose & moist skin
  • Examples = frog, salamader
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FISH
  • Have bodies that are well adapted for life under water
  • Skin is covered with hard and slimmy scales for protection
  • Mostly lay eggs that are fertilised outside their bodies
  • Have fins and tails to swim
  • Breathe with gills
  • Cold-blooded
birds
BIRDS
  • Only animals with feathers
  • Have beaks & wings but not all can fly
  • Breathe with lungs
  • The eggs have hard shells & laid in their nests
  • The eggs fertilised internally
  • Warm-blooded
mammals
MAMMALS
  • Warm-blooded
  • Bodies are covered with hair or fur
  • The eggs fertilised internally
  • Give birth to live young
  • Their young feed on milk from mother’s mammary glands
  • Breathe with lungs
  • Examples = cats, cows, dolphins, rats
reptiles
REPTILES
  • Mostly live on land
  • Have hard dry scales to protect their bodies
  • Breath with lungs
  • Cold-blooded
  • Eggs are fertilised inside the female body
  • Eggs have tough, leathery shells to prevent from drying out
  • Examples = snakes, crocodiles, turtles
classification of plants
CLASSIFICATION OF PLANTS
  • Classify into 2 big groups : flowering plants & non-flowering plants
  • Flowering plants produce flowers. Flowers produce fruits and seeds.
  • Non-flowering plants = conifers, ferns, mosses, algae
  • Conifers = pine trees, casuarina trees
  • Ferns & mosses reproduce by spores
  • Algae = phytoplankton, seaweed
monocotyledons
MONOCOTYLEDONS
  • One cotyledon
  • Have fibrous roots
  • Leaves = parallel veins
  • Mostly herbaceous plants (not have woody stems)
  • Examples = grasses, sugar cane,

corn

dicotyledons
DICOTYLEDONS
  • 2 cotyledons
  • Have tap roots
  • Leaves = a network of veins
  • Trees, shrubs or herbaceous plants
  • Examples = rambutan trees, mango

trees, hibiscus

benefits of biodiversity
BENEFITS OF BIODIVERSITY
  • Source of food : Different food, different nutrients
  • Source of materials : Houses, furniture, handicrafts, textiles
  • Source of medicine : Modern & traditional medicines
  • Clean water : Drink, bathe, grow crops
  • Air to breathe : Circulation of oxygen and carbon dioxide
rio earth summit june 1992
Rio earth summit (june 1992)
  • To protect and manage habitats
  • To educate people
  • To use animals, plants, lands and water wisely
  • To protect threatened species