Photosynthesis

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Slide 1

The Process That Feeds the Biosphere

Photosynthesis is the process that converts solar energy into chemical energy

Directly or indirectly, photosynthesis nourishes almost the entire living world

Slide 2

Autotrophs sustain themselves without eating anything derived from other organisms

Autotrophs are the producers of the biosphere, producing organic molecules from CO2 and other inorganic molecules

Almost all plants are photoautotrophs, using the energy of sunlight to make organic molecules from H2O and CO2

Slide 3

Fig. 10-1

Slide 4

Photosynthesis occurs in plants, algae, certain other protists, and some prokaryotes

These organisms feed not only themselves but also most of the living world

BioFlix: Photosynthesis

Slide 5

Fig. 10-2

(a) Plants

(c) Unicellular protist

10 µm

1.5 µm

40 µm

(d) Cyanobacteria

(e) Purple sulfur

bacteria

(b) Multicellular alga

Slide 6

Fig. 10-2a

(a) Plants

Slide 7

Fig. 10-2b

(b) Multicellular alga

Slide 8

Fig. 10-2c

(c) Unicellular protist

10 µm

Slide 9

Fig. 10-2d

40 µm

(d) Cyanobacteria

Slide 10

Fig. 10-2e

1.5 µm

(e) Purple sulfur

bacteria

Slide 11

Heterotrophs obtain their organic material from other organisms

Heterotrophs are the consumers of the biosphere

Almost all heterotrophs, including humans, depend on photoautotrophs for food and O2

Slide 12

Concept 10.1: Photosynthesis converts light energy to the chemical energy of food

Chloroplasts are structurally similar to and likely evolved from photosynthetic bacteria

The structural organization of these cells allows for the chemical reactions of photosynthesis

Slide 13

Chloroplasts: The Sites of Photosynthesis in Plants