Here is a large set of (subject, predicate, object) triples capturing knowledge about photosynthesis:

---

## **Overview**

| Subject | Predicate | Object |
|---|---|---|
| Photosynthesis | is | biological process |
| Photosynthesis | converts | light energy into chemical energy |
| Photosynthesis | occurs in | plants |
| Photosynthesis | occurs in | algae |
| Photosynthesis | occurs in | cyanobacteria |
| Photosynthesis | occurs in | some protists |
| Photosynthesis | produces | glucose |
| Photosynthesis | produces | oxygen |
| Photosynthesis | consumes | carbon dioxide |
| Photosynthesis | consumes | water |
| Photosynthesis | requires | light |
| Photosynthesis | supports | most life on Earth |

---

## **Location**

| Subject | Predicate | Object |
|---|---|---|
| Photosynthesis | takes place in | chloroplasts |
| Chloroplast | is | organelle |
| Chloroplast | is found in | plant cells |
| Chloroplast | is found in | algal cells |
| Chloroplast | contains | thylakoids |
| Chloroplast | contains | stroma |
| Chloroplast | contains | inner membrane |
| Chloroplast | contains | outer membrane |
| Chloroplast | contains | chlorophyll |
| Thylakoid | is | membrane-bound sac |
| Thylakoids | are stacked into | grana |
| Granum | is | stack of thylakoids |
| Thylakoid membrane | hosts | light-dependent reactions |
| Stroma | is | fluid-filled space surrounding thylakoids |
| Stroma | hosts | light-independent reactions |

---

## **Pigments**

| Subject | Predicate | Object |
|---|---|---|
| Chlorophyll | is | photosynthetic pigment |
| Chlorophyll | absorbs | red light |
| Chlorophyll | absorbs | blue light |
| Chlorophyll | reflects | green light |
| Chlorophyll a | is | primary photosynthetic pigment |
| Chlorophyll b | is | accessory pigment |
| Carotenoids | are | accessory pigments |
| Carotenoids | absorb | blue-green light |
| Carotenoids | reflect | yellow and orange light |
| Phycobilins | are | accessory pigments |
| Phycobilins | are found in | cyanobacteria |
| Phycobilins | are found in | red algae |
| Accessory pigments | transfer energy to | chlorophyll a |
| Pigments | are located in | thylakoid membrane |
| Photosystem I | contains | P700 reaction center |
| Photosystem II | contains | P680 reaction center |
| P700 | absorbs light best at | 700 nm wavelength |
| P680 | absorbs light best at | 680 nm wavelength |

---

## **Overall Equation**

| Subject | Predicate | Object |
|---|---|---|
| Overall equation | is | 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂ |
| Carbon dioxide | is reactant in | photosynthesis |
| Water | is reactant in | photosynthesis |
| Light energy | is reactant in | photosynthesis |
| Glucose | is product of | photosynthesis |
| Oxygen | is product of | photosynthesis |
| Oxygen | is released as | byproduct |
| Oxygen | originates from | water molecules |

---

## **Light-Dependent Reactions**

| Subject | Predicate | Object |
|---|---|---|
| Light-dependent reactions | occur in | thylakoid membrane |
| Light-dependent reactions | require | light |
| Light-dependent reactions | produce | ATP |
| Light-dependent reactions | produce | NADPH |
| Light-dependent reactions | produce | oxygen |
| Light-dependent reactions | involve | Photosystem I |
| Light-dependent reactions | involve | Photosystem II |
| Light-dependent reactions | involve | electron transport chain |
| Light-dependent reactions | involve | water splitting |
| Water splitting | is called | photolysis |
| Photolysis | releases | electrons |
| Photolysis | releases | protons (H⁺) |
| Photolysis | releases | oxygen |
| Photosystem II | absorbs | light |
| Photosystem II | energizes | electrons |
| Photosystem II | passes electrons to | electron transport chain |
| Electron transport chain | pumps | protons across thylakoid membrane |
| Proton gradient | drives | ATP synthase |
| ATP synthase | produces | ATP |
| ATP production via proton gradient | is called | chemiosmosis |
| Photosystem I | re-energizes | electrons |
| Photosystem I | passes electrons to | NADP⁺ reductase |
| NADP⁺ reductase | reduces | NADP⁺ to NADPH |
| NADPH | carries | electrons for Calvin cycle |
| ATP | carries | energy for Calvin cycle |

---

## **Light-Independent Reactions (Calvin Cycle)**

| Subject | Predicate | Object |
|---|---|---|
| Light-independent reactions | are called | Calvin cycle |
| Light-independent reactions | occur in | stroma |
| Light-independent reactions | do not directly require | light |
| Calvin cycle | uses | ATP |
| Calvin cycle | uses | NADPH |
| Calvin cycle | uses | carbon dioxide |
| Calvin cycle | produces | G3P (glyceraldehyde-3-phosphate) |
| G3P | is used to build | glucose |
| G3P | is used to build | other organic molecules |
| Calvin cycle | has three stages | carbon fixation, reduction, regeneration of RuBP |
| Carbon fixation | is catalyzed by | RuBisCO |
| RuBisCO | fixes | CO₂ onto RuBP |
| RuBP | is | 5-carbon molecule |
| CO₂ + RuBP | produces | two 3-carbon molecules (3-PGA) |
| 3-PGA | is reduced to | G3P |
| Reduction of 3-PGA | requires | ATP and NADPH |
| Regeneration stage | converts | G3P back to RuBP |
| Regeneration stage | requires | ATP |
| Three turns of Calvin cycle | fix | one molecule of CO₂ |
| Six turns of Calvin cycle | net produce | one G3P molecule |

---

## **Inputs and Outputs Summary**

| Subject | Predicate | Object |
|---|---|---|
| Light-dependent reactions | input | water and light |
| Light-dependent reactions | output | ATP, NADPH, O₂ |
| Calvin cycle | input | CO₂, ATP, NADPH |
| Calvin cycle | output | G3P, ADP, NADP⁺ |
| ADP and NADP⁺ | are recycled to | light-dependent reactions |

---

## **Types of Photosynthesis**

| Subject | Predicate | Object |
|---|---|---|
| Oxygenic photosynthesis | produces | oxygen |
| Oxygenic photosynthesis | is performed by | plants, algae, cyanobacteria |
| Anoxygenic photosynthesis | does not produce | oxygen |
| Anoxygenic photosynthesis | is performed by | some bacteria |
| Anoxygenic photosynthesis | uses | hydrogen sulfide or other electron donors |
| C3 photosynthesis | fixes CO₂ into | 3-carbon compound |
| C3 plants | include | wheat, rice, soybeans |
| C4 photosynthesis | fixes CO₂ into | 4-carbon compound first |
| C4 plants | include | corn, sugarcane |
| C4 photosynthesis | reduces | photorespiration |
| CAM photosynthesis | opens stomata | at night |
| CAM plants | include | cacti and succulents |
| CAM photosynthesis | is adaptation to | arid environments |
| C4 and CAM | are adaptations to | hot, dry, or high-light conditions |

---

## **Factors Affecting Photosynthesis**

| Subject | Predicate | Object |
|---|---|---|
| Light intensity | affects | rate of photosynthesis |
| CO₂ concentration | affects | rate of photosynthesis |
| Temperature | affects | rate of photosynthesis |
| Water availability | affects | rate of photosynthesis |
| Chlorophyll concentration | affects | rate of photosynthesis |
| Increasing light intensity | increases | photosynthesis rate (up to a point) |
| Very high light intensity | can cause | photoinhibition |
| Optimal temperature | maximizes | enzyme activity in photosynthesis |
| High temperature | denatures | photosynthetic enzymes |
| Low CO₂ | limits | Calvin cycle activity |

---

## **Ecological Significance**

| Subject | Predicate | Object |
|---|---|---|
| Photosynthesis | is basis of | most food chains |
| Photosynthesis | produces | atmospheric oxygen |
| Photosynthesis | removes | CO₂ from atmosphere |
| Photosynthesis | is part of | global carbon cycle |
| Photosynthetic organisms | are called | autotrophs or producers |
| Autotrophs | support | heterotrophs |
| Photosynthesis | contributed to | Great Oxidation Event |
| Great Oxidation Event | occurred approximately | 2.4 billion years ago |
| Photosynthesis | stores | solar energy in organic compounds |

---

## **Evolution**

| Subject | Predicate | Object |
|---|---|---|
| Chloroplasts | are thought to have originated from | endosymbiosis with cyanobacteria |
| Endosymbiotic theory | proposes | ancient eukaryote engulfed cyanobacterium |
| Cyanobacteria | were | first oxygenic photosynthesizers |
| Photosynthesis | evolved approximately | 3.5 billion years ago |
| Anoxygenic photosynthesis | evolved before | oxygenic photosynthesis |

---

This covers the major factual territory of photosynthesis in triple form. Let me know if you'd like any area expanded further.
