Lecture 17

Question 1

carbon cycle

Answer 1

inorganic form is CO2 in atmosphere. autotrophs convert it to organic carbon via photosynthesis which can be moved to heterotrophs and then back into the air

Question 2

law of ecology

Answer 2

everything is connected
everywhere must go somewhere
nature knows best
theres no such thing as a free lunch

Question 3

autotrophs in the C cycle

Answer 3

photoautotrophs: use light as energy source

chemoautotrophs: uses chemical energy source e.g methanogens consume CO2 and H2 to make CH4 they act as C sinks and are anaerobic (killed by O2)

Question 4

methanotrophs

Answer 4

Consumes CH4, produce CO2. Also remove more toxic pollutants

Question 5

decomposers

Answer 5

use organic C produced by dead things and break it down in the soil for the use of other organisms. Mainly fungi

Question 6

predators

Answer 6

protists, detritivores. consumes other organisms

Question 7

coral symbiosis

Answer 7

primitive animals which depend on symbioti relationship with algae to supply with food. miniture ecosystem. atmospheric CO2 -> algae symbiotant (sugar produced) -> coral host (C02) REPEAT

Question 8

lichen symbiosis

Answer 8

primary producers. photosynthetic but not plants. symbiosis between algae (autotroophs) and fungi (heterotrophs)