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Science Investigative Project
• Duckweed (Lemna)
Preparation of Materials
• 2 culture containers (basins or bowls) of equal size
• 20 fronds of duckweeds
• Pond water
• Record Notebook
• Pen
• Marker
Reptiles
Characteristics of Reptiles
• Amniotes- “amnions”-elastic sac where the embryo develops.
• Most are oviparous but some are viviparous.
• Skin covered by scale or scutes.
• Ectothermic
Characteristics of Reptiles
• All have three chambered heart except for crocodiles which have four.
• Absence of gill even during the juvenile stage but presence of well developed lungs.
• Ear holes instead of external ear
Group of Reptiles
Orders of Reptiles
Order Crocodilia Order TestudiniaOrder SquamataOrder Rynchocephalia
Order Crocodilia
• Semi-aquatic predators
• Extra transparent eyelid
• Flap of skin at the back of their throat.
•Carnivorous
Characteristics
•Diapsids-two holes on each side of the skull.
•Oviparous
•Eyes on top of the head.
•Laterally compressed teeth
Characteristics
•Nostril at the tip of the snout.
Order Testudinia
• Upper and lower bony shells surrounding their body.• Carapace-Dorsal
• Plastron-Ventral
Characteristics
• Absence of teeth instead keratinous beak.
• Oviparous
• Young are independent of the parent at hatching.
• Temperature sex determination
Order Squamata
•Lizards
•Snakes
•Worm Lizards
Lizards
• Two pairs of legs
• Upper and lower laws unite anteriorly
• Most are oviparous some are ovoviviparous
The only venomous lizard
Gila Monster (Heloderma suspectum)
American Beaded Lizard (Heloderma horridum)
Snakes
• Limbless but some have traces of hind limbs (python and boa)
• Internal fertilization
• Joints between vertebrae
• Jacobson’s organ or vomeronasal organ
• Movable upper jaws and loosely joined lower jaw
Worm Lizards
• Specialized burrowers
• Single median tooth in the upper
• Legless and skulls are wedge or shovel shaped
• Skin have ring like folds called annuli
• Oviparous
Order Rhynchocephalia
• Two rows of teeth on the upper jaw and one row of teeth on the lower jaw.
• Oviparous