Chapter 4 Unit 3

Question 1

Photosystems

Answer 1

a biochemical mechanism in plants by which chlorophyll absorbs light energy for photosynthesis

Question 2

Main Function of the Light- Dependent Reactions are

Answer 2

Water molecules are broken down into hydrogen ions, electrons, and oxygen gas. The oxygen is given off as a waste product. Sugars are not made during this part of photosynthesis

Question 3

Photosystem II and Electron Transport (The 3 Steps)

Answer 3

In photosystem II, chlorophyll and other light-absorbing molecules in the thylakoid membrane absorb energy from sunlight.
1. ​Energy absorbed from sunlight
2. -Water molecules split
3. -Hydrogen ions transported

Question 4

Photosystem I and the Energy-Carrying Molecules (The 2 Steps)

Answer 4

In photosystem I, chlorophyll and other light-absorbing molecules in the thylakoid membrane also absorb energy from sunlight. The energy is added to electrons, some of which enter photosystem I from photosystem II.

Question 5

ATP Production (The 2 Steps)

Answer 5

In photosystem I, chlorophyll and other light-absorbing molecules in the
thylakoid membrane also absorb energy from sunlight. The energy is added
to electrons, some of which enter photosystem I from photosystem II.

The final part of the light-dependent reactions makes ATP. The production
of ATP depends on the H+ ions that build up inside the thylakoid from
photosystem II, and on a complex enzyme in the thylakoid membrane.
-hydrogen ion diffusion
-ATP produced

Question 6

The Calvin Cycle (The 4 Steps)

Answer 6

The Calvin cycle cannot take place without the ATP and NADPH from the
light-dependent reactions.
-carbon dioxide added
-Three-carbon molecules formed
-Three-carbon molecules exit
-4 Three-carbon molecules recycled

Question 7

Functions of Photosynthesis

Answer 7

It also provides materials for plant growth and development. The simple sugars from photosynthesis are bonded together to form complex carbohydrates such as starch and cellulose.