Photosynthesis, Respiration, and Photorespiration

Question 1

Where does photosynthesis occur?

Answer 1

Organ: Leaf
Tissue: Pallisade & Spongy mesophyll
Cells: Parenchyma 
Organelle: Chloroplast
Parts of organelle: Thylakoid and stroma

Question 2

Photosynthesis (definition)

Answer 2

Sugar production by the conversion of light energy to chemical energy. CO2+H2O+energy (light) –> O2+C6H12O6. 2 steps: Light reactions and Calvin Cycle

Question 3

Light reactions

Answer 3

Converting light energy into chemical energy. Light absorbed by pigments (chlorophyll and carotenoids). Energy is passes from pigments to proteins and other compounds.

The results: 1. Water molecules are split into Oxygen (O2) and Protons (H+). 2. NADPH is produced. 3. ATP is produced (The plant will use 2 & 3 to do work)

Question 4

Calvin Cycle

Answer 4

Uses chemical energy produced in light rxns to produce sugar.

Question 5

Light Reaction Formula

Answer 5

Pigments+H2O+light=O2+NADPH+ATP

Question 6

The Calvin Cycle

Answer 6

A cycle of chemical reactions that converts the C of CO2 into a form that the plant can use (sugar). Requires A LOT of energy (NADPH and ATP). Also requires rubisco (the most abundant enzyme on earth).

Question 7

Enzyme

Answer 7

Brings together

Question 8

Respiration

Answer 8

The controlled breakdown of sugar to release energy stored as sugar. C6H1206+O2–>CO2+H2O+Energy. Occurs in the mitochondria.

Question 9

Photorespiration

Answer 9

When Rubisco fucks up. Since Rubisco is not a “perfect” enzyme. It can add Oxygen or CO2 during the Calvin Cycle

Question 10

If Rubisco grabs and O2 molecule what happens during the Calvin Cycle?

Answer 10

Creates less sugar using MORE energy!