Photosynthesis

Question 1

Photosynthesis is a series of light driven reactions thay creates organic molecules from ………

Answer 1

Atmospheric carbon dioxide

Question 2

Which organisms use photosynthesis?

Answer 2

Cyanobacteria, plants and algae

Question 3

Which part of plants is the major source of photosynthesis?

Answer 3

Leaves

Question 4

Chloroplasts contain ……… which form stacks known as ……..

Answer 4

Thylakoids form stacks of grana

Question 5

What is the space between the thylakoids called?

Answer 5

Stroma

Question 6

Which part or the chloroplasts contains the photosynthetic machinery?

Answer 6

The thylakoid

Question 7

What are the thylakoids?

Answer 7

The third membrane. Folded in to disk like sacs.

Question 8

What is the first stage of photosynthesis?

Answer 8

The light dependant reaction

Question 9

What is the second stage of photosynthesis?

Answer 9

The light independent reaction

Question 10

What do chlorophyll molecules do?

Answer 10

Absorb energy from sunlight

Question 11

Which light do chlorophyll molecules absorb best?

Answer 11

Red and blue wavelength

Question 12

What wavelength is blue light?

Answer 12

430 nm

Question 13

What wavelength is red light ?

Answer 13

660 nm

Question 14

What colour light do chlorophyll molecules NOT absorb?

Answer 14

Green

Question 15

Why can Chlorphyll molecules harness energy from sunlight?

Answer 15

They have a unique structure. The electrons are distributed in a decentralized cloud around the molecules light-absorbong pophyrin ring.
They can become excited

Question 16

Where are chlorophyll molecules held?

Answer 16

In large multi protein complexes called photosystems

Question 17

What are photosystems ?

Answer 17

A large multi protein complex made of chlorophyll molecules.

Question 18

What do photosystems consist of?

Answer 18

A set of antenna complexes and a reaction centre

Question 19

What do the antenna complexes do?

Answer 19

Capture light energy

Question 20

What do reaction centres do?

Answer 20

Convert light energy in to chemical energy

Question 21

What happens to energy in the antenna complex?

Answer 21

The ENERGY is passed from one chlorophyll to the next as they pass on the excited state, until it reaches the special pair in the reaction centre

Question 22

What happens to energy in the reaction centre?

Answer 22

Electron transfer A transmembrane complex of proteins and pigments accept a high-energy electron from the special pair.

Question 23

When the electron carrier accepts an electron, what happens to it’s charge?

Answer 23

Becomes negative

Question 24

What is the first photosystem called?

Answer 24

Photosystem II

Question 25

Where is water split?

Answer 25

In photosystem II

Question 26

What are the products of the light dependant reaction?

Answer 26

ATP, NADPH and oxygen

Question 27

What happens in the light independent reaction?

Answer 27

ATP and NADPH are used to convert CO2 in to sugars

Question 28

Where do the light dependant reactions take place in the chloroplast?

Answer 28

In the thylakoid

Question 29

What are the three stages of the light independent reaction?

Answer 29

1. Fixation 2. Reduction 3. Regeneration of acceptor

Question 30

What is the name of the scheme that occurs between photosystem I and II

Answer 30

The Z scheme

Question 31

What other names may the light independent reaction be given?

Answer 31

Carbon assimilation reactions | Calvin cycle

Question 32

Is photosynthesis catabolic or anabolic? Why?

Answer 32

Anabolic. Builds up molecules

Question 33

In the Calvin cycle, carbon dioxide is incorporated in to a 3 carbon compound called.....

Answer 33

3 - phosphoglycerate

Question 34

What is 3-phosphoglycerate reduced in to?

Answer 34

Glyceraldehyde 3-phosphate

Question 35

What is glyceraldehyde 3-phosphate regenerated in to?

Answer 35

Ribulose 1,5-bisphosphate

Question 36

How much does reduction stage of calvin cycle cost?

Answer 36

6 NADPH and 6 ATP

Question 37

How much does the regeneration stage of the Calvin cycle cost?

Answer 37

3 ATP

Question 38

How many CO2 enter the Calvin cycle ?

Answer 38

3

Question 39

What balances the production of NADPH and ATP in the Z scheme? At what ratio?

Answer 39

Cyclic flow | 3:2 ATP:NADPH

Question 40

What are the fates of glyceraldehyde 3-phosphate

Answer 40

1. Glycolysis 2. Converted to fructose 6-phosphate and then to sucrose which is transported out of the cell 3. Converted to fructose 6-phosphate and then to starch.

Question 41

Which photosystem is P680?

Answer 41

Photosystem II

Question 42

Which photosystem is P700?

Answer 42

Photosystem I

Question 43

Where are photosystem I and II located?

Answer 43

Thylakoid membrane

Question 44

What is the intermediary between PSI and PSII ?

Answer 44

The cytochrome complex

Question 45

Where does the calvin cycle occur?

Answer 45

in the stroma