Photosynthesis Flashcards Preview

A Level Biology: Topic 5 (Edexcel) > Photosynthesis > Flashcards

Flashcards in Photosynthesis Deck (27):
1

What is photosynthesis?

The process by which plants capture energy from the sun using mitochondria and convert it into carbon dioxide, water and simple sugars

2

What are the materials needed for photosynthesis?

Water
Carbon dioxide

3

What are the products of photosynthesis?

Glucose
Oxygen

4

What is the chloroplast envelope?

The 2 membranes outside of the chloroplast with with a space between them

5

What are grana?

A system of membranes arranged in stacks inside the chloroplast

6

What are thylakoids?

The membrane discs that make up a granum in the chloroplast

7

What is the stroma?

The matrix of the chloroplast

8

What are some of the different kinds of chlorophyll?

Chlorophyll a
Chlorophyll b
Carotenoids
Phaeophytin

9

What is the most abundant type of chlorophyll?

Chloryphyll a

10

Why are different kinds of chlorophyll needed?

Each type absorbs a different part of the spectrum so they're needed to maximise the ammount of light absorbed.

11

How do you work out the Rf value in chromatography?

distance travelled by solute
____________________
distance travelled by solvent

12

What are the names of the photosystems?

Photosystem 1 (PSI)
Photosystem 2 (PSII)

13

Where does the light dependant stage take place?

Thylakoid membranes

14

What happens at the beginning of the light dependant stage?

Light splits a molocule of water in a photochemical reaction
Light hits a chlorophyll and raises the electrons to a higher energy level where the leave the molocule and are taken up by an electron acceptor into either cyclic or non-cyclic photophosphorelation.

15

What are the products of the light dependant reactions?

ATP
NADPH

16

Which photosystem is involved in cyclic phosphorelation?

PSI

17

What is photolysis?

The spitting of a water molocule

18

How is photolysis used in noncyclic photophosphorelation?

Electron from splitting water is used to stabalize PSII after it gave its electron to PSI

19

What is NADP?

An electron acceptor

20

In what part of photosynthesis is the Calvin cycle?

Light-independant reactions

21

Where do the light independant reactions take place?

Stroma of the chloroplast

22

What is the first thing to be formed in the Calvin cycle?

RUBISCO

23

How does RUBISCO change into GP?

RUBISCO is theoretically a 6 carbon compound but is very unstable so almost instantly forms 2 3 carbon compounds (GP)

24

How is GP changed into GALP?

GP is reduced (hydrogen added)

25

What is the primary end product of photosynthesis?

GALP

26

Where is GALP used?

Fed back into the Calvin cycle to produce glucose (gluconeogenesis)
Fed into the Krebs cycle (respiration) to be used in glycolysis

27

What are the limiting factors for photosynthesis?

Light
Tempreture
Carbon dioxide levels