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Biology Revision Year 2 > Photosynthesis > Flashcards

Flashcards in Photosynthesis Deck (29)
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1

What is an organic compound?

A compound that contains a carbon atom

2

What is an inorganic compound?

One that doesn’t contain carbon

3

What is oxidation?

O I L R I G Oxidation is loss of hydrogen or gaining oxygen

4

What is a co enzyme?

Non protein molecule that help enzymes to function eg) NAD

5

What is phosphorylation?

Adding a phosphate eg) ADP + Pi

6

What is photophosphorylation?

Using light to add a phosphate.

7

What uses light to split a molecule?

Photolysis

8

What is an ETC?

Where electrons flow through proteins in a membrane

9

What is a proton?

A positive charge eg) H+

10

What is a chloroplast?

An organelle that absorbs light energy to be used for photosynthesis, to make useful organic compounds

11

What is a thylakoid?

Membrane is the site of the light dependant reaction, high SA, contains photosynthetic pigments. Eg) chlorophyll A+B and carotene

12

Why is photosynthesis important?

It converts light energy into chemical energy (stored in carbs) This allows the energy to be transferred to other organisms by consumption

13

What is the chemical equation of photosynthesis?

6CO2 + 6H2O ———> 6O2 + C6H12O6

14

Where does the light dependant reaction take place?

Chlorophyll (thylakoid membrane)

15

Describe the light dependant reaction. (5 steps)

The light energy is absorbed by photosynthetic pigments in the chlorophyll

This excites the electrons they leave the chloroplasts which is then photoionised

The electrons are transferred through5 a carrier molecule in the thylakoid membrane

as electrons move down the ECT they use energy to pump protons from the stroma into the thylakoid creating a proton gradient

The protons diffuse out via the ATP synthase enzyme releasing energy for the Phosphorylation of ADP +Pi to ATP. ( chemiosmosis)

16

name 3 photosynthetic pigments 

chlorophyll A, chlorophyll B, carotene 

17

What are the products of the light dependent reaction?

ATP + NADPH

18

What is the role of the Calvin Cycle?

uses products of LDR to make useful organic products from CO2

19

What is the first stage of the calvin cycle?

CO2 (1C) combines with RUBP (5C) catalysed by the enzyme rubisco to make 2 molecules of GP (3C each)

20

What is stage 2 of the calvin cycle?

Both molecules of GP (3C each) are reduced by LDP products (ATP ----> ADP and NADPH-----> NADP) to form 2 TP (3C each)

21

what is stage 3 of the calvin cycle?

most TP is regenerated to form RUBP, some TP is used to make useful organic compounds  eg) glucose 

22

How many extra carbons are there per spin of the calvin cycle?

1

23

Name 3 limiting factors of photosynthesis

Temperature, CO2 conc, light intensity 

24

Light intensity as a limiting factor 

higher the light intensity the more energy there is for the LDR so the faster the rate of photosynthesis

light needs to be of teh right WL 

25

CO2 conc as a limiting factor 

optimum CO2 is 0.4% atmosphere is 0.04% in atmosphere 

limiting factor during the day 

26

Temperature as a limiting factor 

Increases KE increasing Enzyme action

can increase transpiration --- stomata close 

 

27

How can farmers use light intensity to increase yield?

use a green house 

use light of correct wavelength

28

How can farmers use CO2 to increase yield?

fossil fuel burner increases CO2 conc 

29

How can farmers use temperature to increase yield?

burner increases temp 

greenhouse traps warm air 

maintain optimum temperature using thermostat