Lecture 18

Question 1

Soil food web:

Answer 1

how different organisms interact and, in particular, how nutrients, energy and carbon are exchanged.

Question 2

First trophic level

Answer 2

Photosynthesizers

Question 3

Second trophic level

Answer 3

1. ) Decomposers
2. ) Mutualists
3. ) Pathogens, Parasites
4. ) Root-eaters

Question 4

Third trophic level:

Answer 4

1. ) Shredders
2. ) Predators
3. ) Grazers

Question 5

Fourth trophic level:

Answer 5

Higher level predators

Question 6

Fifth and higher trophic level

Answer 6

Higher level predators

Question 7

Macrofauna (> 2mm)

Answer 7

earthworms and termites

Question 8

Mesofauna (0.1-2mm)

Answer 8

Springtails and mites

Question 9

Microfauna (<0.1 mm)

Answer 9

Nematodes

Question 10

Microorganisms (<0.1 mm)

Answer 10

Fungi, bacteria, area, and protists.

Question 11

Benefits of fungi

Answer 11

Form filamentous hyphae, which is good for “foraging” for food and is important for aggregate stabilization

Question 12

Protists

Answer 12

Can occupy thin girls of water o soil particles.

Question 13

earthworms

Answer 13

Earthworms can ingest a weight of soil equal to 2 to 30 times their own weight per day