Biology 1 Chapter 10 (Lecture)

Question 1

Photosynthesis

Answer 1

The conversion of light energy to chemical energy that is stored in sugar and other organic compounds.

Question 2

Autotrophs

Answer 2

Make food by photosynthesis (Plants, Algae, & some Protists)

Question 3

Heterotrophs

Answer 3

Consumers (Humans)

Question 4

The two stages of photosynthesis:

Answer 4

• Light Reaction
• Calvin Cycle

Question 5

The part of the plant that is the major site of photosynthesis

Answer 5

The leaves. Within the cells of the plants, the organelles where photosynthesis actually takes place is called the chloroplasts. This organelle is surrounded by 2 membranes.

Question 6

Stomata

Answer 6

Microsopic pores where CO2 enters the leaf and O2 exits.

Question 7

Thylakoids

Answer 7

The flattened membranous sac inside a chloroplast that contain the molecular “machinery” used to convert light energy to chemical energy.

Question 8

Grana

Answer 8

Thylakoid space that are stacked in columns that look like a stack of poker chips.

Question 9

Overall Reaction for Photosynthesis:

Answer 9

6CO₂ + 12H₂0 + LIGHT ENERGY → C₆H₁₂0₆ + 6O₂ + 6H₂0

Question 10

The oxygen given off by plants comes from:

Answer 10

Water and not carbon dioxide.

Question 11

Photosynthesis is:

Answer 11

Endergonic.

Anabolic.

Question 12

In the light reaction solar energy is converted to:

Answer 12

Chemical Energy.

Question 13

The light reactions produce no sugar. They are important because they convert light energy to chemical energy in the form of 2 compounds:

Answer 13

ATP & NADPH

These compounds are used to provide the energy for the Calvin Cycle.

Question 14

The Calvin Cycle begins by incorporating:

Answer 14

CO2 from the air into organic molecules already present in the chloroplast.

Question 15

The Clavin Cycle makes suagr, but it can only do so with the help of:

Answer 15

ATP & NADPH which are produced by the light reactions.

Question 16

The light reactions occur in the:

Answer 16

Thylakoids of the chloroplast and the Clavin Cycle occurs in the stroma.

Question 17

Which colors work best for photosynthesis?

Answer 17

Red or Blue.

Not Green.

Question 18

When a photon of light hits an electron, it goes to an “excited state” which is unstable. When the electron drops back down to the ground state orbital, excess energy is released as:

Answer 18

Fluorescence or Heat

Question 19

The Calvin Cycle is:

Answer 19

• Anabolic (endergonic)
• Consumes Energy
• Carbon enters Calvin Cycle in the form of CO2 and leaves in the form of Sugar.
• The carbohydrate produced directly from the Calvin Cycle is actually not glucose, but is a 3 carbon sugar called G3P (Clyceraldehyde 3-Phosphate)

Question 20

To synthesis 1 glucose molecule, the Calvin Cycle uses:

Answer 20

• 6 molecules of CO2
• 18 molecules of ATP
• 12 molecules of NADPH

Question 21

Typical cell has ___ chloroplasts

Answer 21

30-40

Question 22

Cellular Respiration (Reactants & Products)

Answer 22

• Needs O2 (reactant)
• CO2 is produced (product)

Question 23

Photosynthesis (Reactants & Products)

Answer 23

• Needs CO2 (reactant)
• O2 is produced (Product)