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Aim: How does locomotion occur in lower organisms? I. Locomotion in Lower Organisms A. Locomotion in the Ameba 1.Uses pseudopods (false feet) to move 2.Cytoplasm inside cell pushes toward cell membrane causing the ameba to move
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What are the advantages of locomotion?
1.Able to seek out food.2.Able to seek shelter.3.Able to escape from predators.4.Able to seek mates.
Aim: How does locomotion occur in lower organisms?
I. Locomotion in Lower Organisms
A. Locomotion in the Ameba
1.Uses pseudopods (false feet) to move2.Cytoplasm inside cell pushes toward
cell membrane causing the ameba to move
B. Locomotion in the Paramecium
1. Uses beating cilia (microscopic hair-like structures) to move
C. Locomotion in the Hydra
1.Is essentially sessile (does not move)2.But… It does have the ability to move in 3
ways:a.Somersaultb.Bend over, attach its tentacles to the sea
floor, and then inch its base closerc.Glide along its base
D. Locomotion in the Earthworm
1. Uses two sets of muscles (circular and longitudinal) to contract and lengthen its body to inch it forward.2. Uses setae (bristles) to anchor itself into the ground
E. Locomotion in the Grasshopper
1.Has an exoskeleton (skeleton that is outside organism’s body). Exoskeleton is a non-living material.
2. It does not grow with organism, so organism has to molt (shed) its exoskeleton in order for a new, larger one to grow.
3.Has six legs that are used for walking and jumping.a.Front two pair are for walkingb.Rear pair are for jumping – can jump
200x its body length!!!
4. 2 sets of wings. a. outer pair are for protectionb. Inner pair are for flying
Q. What are the advantages of locomotion?
Lyle, it is your turn today.
Of course Lyle!!! Locomotion is good for finding food, seeking shelter, seeking mates, and staying away from predators. Nice job Lyle!
Q. Which organism uses setae to anchor itself to the ground?
John Costanzo! Please answer this question.
Yup, the earthworm. Nothing gets past you John!
One more…Q. How do the grasshopper’s front legs differ from it’s back legs?
Allison, you are being awfully quiet. Please answer this question for the class.
Great job Allison!! The back legs are much larger than the front two pair. This is because the back ones are used for jumping.
