Topic 3 The wood-wide web

Question 1

Why was the term ‘Wood-wibe web’ coined?

Answer 1

It was found that organic compounds move in both directions between two different species of tree via fungal strands connecting them below the ground.

Question 2

Tree seedlings with what environmental situation recieve more organic compounds through the wood wide web than those not in the situation?

Answer 2

Tree seedlings in shade.

Question 3

It is debated that natural selection is not acting upon trees and favouring altruism, what is an alternative?

Answer 3

That the fungi forming the network are in control of the movement of organic compounds entirely, and natural selection is acting on the fungi rather than the trees.

Question 4

What type of evolution can be seen in the relationship between mutualistic trees and fungi?

Answer 4

Coevolution

Question 5

The lack of what ensures the continuence of the wood wide web?

Answer 5

Specificity (species)

Question 6

Name the types of relationship by their notation:
a. +,+
b. +,-
c. +,0
d. -,-
e. -,0
f. 0,0

Answer 6

a. mutualism
b. predation/parasitism
c. commensalism
d. competition
e. amensalism
f. no interaction

Question 7

What is the key characteristic of unikonts?

Answer 7

one flagellum

Question 8

What did unikonts give rise to?

Answer 8

slime moulds, animals, and fungi

Question 9

What are bikonts characterised by?

Answer 9

Two flagella

Question 10

What did bikonts give rise to?

Answer 10

Plants and algae

Question 11

List three characteristics shared by animals and fungi that demonstrate their common evolutionary history and which set them apart from algae and plants.

Answer 11

• The use of the polymer chitin for rigidity
• A single flagellum on motile cells
• Lack chloroplasts | must ingest other organisms or their products for energy

Question 12

Name the 5 major fungal groups.

Answer 12

• Chytridiomycota
• Zygomycota
• Glomeromycota
• Ascomycota
• Basidiomycota

Question 13

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