9. 1.2.1 Differentiate organisms using a dichotomous key based on common characteristics.
1.2.2 Characterise the major taxonomy group.
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A dichotomous key is a tool that
can be used to identify organisms
or objects in the natural world,
such as plants, animals, or rocks.
22. Poikilotherm
- Cold blooded
- Body temperature that changes
according to its surrounding
temperature
Important!
Homeotherm
- Warm blooded
- Body temperature that is constant and
free from the influence of its
surrounding temperature
23. Internal Fertilisation
- The male deposits his sperm into the
female’s body
Important!
External Fertilisation
- Male and female’s gametes unite
outside the female’s body
25. • Poikilothermic
• Covered in hard and slimy
scales
• Have fins and a tail
• Breathe through gills
• Lay eggs
• Undergo external fertilisation
Fish
Vertebrates
Grouper
Eel
Clown Fish
26. • Poikilothermic
• Live on land and in water
• Covered with moist skin
• Young amphibians breathe through
gills
• Adult amphibians breathe using
their lungs and moist skin
• Produce jelly-like eggs (spawn)
without a shell
• Undergo external fertilisation
Amphibians
Vertebrates Frog Spawn
Tadpole
Toad
Salamander
Frog
27. • Poikilothermic
• Produce eggs with a shell
• Breathe through lungs
• Have scales and hard skin
• Undergo internal fertilisation
Turtle
Reptiles
Vertebrates
Crocodile
Iguana
Snake
28. • Homeothermic
• Covered with feathers to
maintain body temperature
• Breathe through lungs
• Have wings that help some birds
to fly
• Have a pair of scaly feet
• Undergo internal fertilisation
• Produce eggs with hard shell
Birds
Vertebrates Kingfisher Owl
Duck
29. • Homeothermic
• Covered with fur or hair
• Breathe through lungs
• Undergo internal
fertilisation
• Give birth and nurse their
young
Mammals
Vertebrates Giraffe
Bat
Elephant
Lion
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extra
Chondrichthyes
characteristics
•They are mostly marine
fishes.
•They contain a pair of jaws.
...
•Whale sharks are the second
largest vertebrate and the
largest fish. ...
•The mouth is present
ventrally.
•They contain cartilaginous
endoskeleton, the deposits of
calcium salts provide strength
to it.
