Symbiosis

Question 1

What is symbiosis?

Answer 1

A close relationship between two different species

Question 2

What is parasitic symbiosis?

Answer 2

When one organism (the parasite) benefits from the other organism (the host), while causing harm to the host.

Question 3

Name 2 examples of parasitic symbiosis

Answer 3

Any 2 from:

• Human Head Louse
• Human flea
• Mistletoe
• Human tapeworm
• Elephantiasis

Question 4

What is mutualistic symbiosis?

Answer 4

Occurs when two different organisms live together in a relationship that benefits them both.
IF ONE IS REMOVED, OFTEN THE OTHER ONE CANNOT SURVIVE

Question 5

Name 2 examples of mutualistic symbiosis.

Answer 5

• Root nodules contains nitrogen fixing bacteria
• Cleaner fish
• Maize containing AM fungi
• Chemosynthesis bacteria in tube worms
• Coral polyps - attach to rocks, contain photosynthetic algae, removes excess carbohydrates when food is low

Question 6

What type of relationship exists between chemosynthesis bacteria and tube worms? Why?

Answer 6

Mutualistic symbiosis

Question 7

Can chemosynthetic bacteria make food for themselves?

Answer 7

Yes

Question 8

Why does a mutualistic symbiosis relationship exist between chemosynthetic bacteria and tube worms?

Answer 8

• The bacteria generate carbons using chemicals from hydrothermal vents, forming glucose as a result (can be eaten by secondary producers)
• The bacteria also oxidise sulphur compounds in chemosynthesis, producing organic material

Question 9

What are chemosynthetic bacterium also known as?

Answer 9

Autotrophs