8.2 Photosynthesis: An Overview

Question 1

In order for photosynthesis to occur,

Answer 1

light energy from the sun must be captured

Question 2

sunlight is a mixture of different:

Answer 2

wave lengths

Question 3

Photosynthetic organisms capture energy from sunlight with:

Answer 3

pigments

Question 4

What are the 2 types of chlorophyll?

Answer 4

chlorophyll a and b (absorb light light well in the blue-violet, and red regions, not well in green which is why plants look green bc they reflect green light)

Question 5

In the fall, cholorphyll molecules break down, exposing:

Answer 5

reds and oranges

Question 6

light is a form of energy so any compound that absorbs light,

Answer 6

absorbs energy

Question 7

When cholorphyll absorbs light, a large fraction of that light energy is transferred directly to electrons in the chlorophyll (this happens in photolysis)- by raising…

Answer 7

the energy levels of these electrons, light energy can produce a steady supply of high-energy electrons.

Question 8

An electron carrier is a compound that can accept a pair of:

Answer 8

high energy electrons and transfer them along with most of their energy, to another molecule

Question 9

high energy electron carriers are used to help build:

Answer 9

many molecules the cell needs like carbohydrates like glucose

Question 10

photosynthesis uses the energy of sunlight to convert water and carbon dioxide (reactants) into:

Answer 10

high energy sugars and oxygen (products)

Question 11

After sugars are made, plants use those sugars to produce complex carbs like:

Answer 11

starches, and to provide energy for the synthesis of other compounds (proteins, lipids)

Question 12

6CO2 + 6H20 —> (light) C6H12O6 + 6O2

Answer 12

carbon dioxide plus water uses light to become sugars and oxygen

Question 13

in the light dependent reactions, energy from the sun is used to produce:

Answer 13

energy rich compounds like ATP and NADPH

Question 14

the light dep. takes place in the:

Answer 14

thylakoid membranes

Question 15

water is required in the light- dependent reactions as a source of:

Answer 15

electrons and hydrogen ions, oxygen is released as a byproduct

Question 16

in the light independent reactions no:

Answer 16

light energy is required

Question 17

the light indpendent reactions takes place in the:

Answer 17

stroma

Question 18

in the light ind. plants absorb CO2 from the atmosphere and complete the process of photsynthesis by:

Answer 18

producing carbon-containing sugars and other carbs