Lecture 4

Front 1

Autotrophs:

Back 1

assimilate radiantenergy from the sunlight( photosynthesis ) or from inorganic compounds (chemosynthesis )

Energy is converted into chemical energy stored in bonds of organic molecules

Front 2

Heterotrophs:

Back 2

gettheir energy by consuming organic compounds from other organisms

Front 3

Holoparasites:

Back 3

plantsthat don’t have any photosynthetic pigments and get their energy from otherplants ( heterotrophs )

Front 4

Hemiparasite:

Back 4

is photosynthetic but obtains some of itsnutrients energy and water from the host plant

Front 5

Light compensation point:

Back 5

CO2 uptake is balanced by Co2 loss by respiration

Just enough light to survive and nothing else

Front 6

Saturation point:

Back 6

whenphotosynthesis rate no longer increases as light increases

Front 7

Chemosynthesis:

Back 7

chemolithotrophy)energy from inorganic compounds is used to produce carbohydrates Important in nutrient cycling bacteria and hydrothermal vent communities

Front 8

C4 photosynthetic pathway:

Back 8

reducesphotorespiration

Evolvedindependently several times

Transpiration losses are minimized becausePEPcase can take up CO2 even when stomates arenot fully open.

Manygrasses

Front 9

CAMPlants:

Back 9

open their stomates at night whencooler and higher humidity and close them during the day

CO2 uptake and the Calvin cycle areseparated temporally

extremely dry climates