Oct 6th

Single Celled protistans

How do many protistans get their nutrients 

through photosynthesis or chemo heterotrophic 

How do chemo heterotrophic organisms get their nutrients

• engulf food

• use a mouth likes tructure

• absorb small molecules across the cell membrane

What is locomotion

how single celles protistans move

How do single celled protistans move

• some are attached to other organisms so they don’t move

• some float in water with no control

• some swim using cilia or flagella

• some “crawl” using amoeboid locomotion

what is amoeboid locomotion

a way of movement. Your body is a semi fluid so it flows in any direction 

What are protistans shells made out of

protein, silicon, calcium carbonate

Do all protistans have shells

no

What does calcium carbonate from marine protistans form 

a rock called limestone 

What are limestones economical values

land scaping + construction

Gravel roads

Concrete

Fed to livestock - source of calcium

What type of reproduction is common in single celled pritistans but is not the main method

a sexual reproduction

what is asexual reproduction in single celled protistans similar to 

fission in bacteria 

what is fission in batcteria

one cell pinches off to make 2 cels

What is the most common type of reproduction in single celled protistans

sexual reproduction

What are the dis advantages of sexual reproduction 

takes a lot of time and energy 

it can be dangerous 

What are the advantages of sexual reproduction

variation in offspring

How is variation in offspring important in survival 

when there is variation in offspring there is likely some offspring that can survive when environment changes 

What are the methods of sexual reproduction

• an individual fills with sperm or eggs and then bursts releasing the sperm

• 2 cells fuse to eachother, eventually they go through meiosis to produce 4 new cells

How do cells tell eachother they are ready to sexually reproduce

they release chemical signals to synchronize reproduction in an area