Photosynthesis

Question 1

describe the process of photosynthesis

Answer 1

the process in which light energy is used in the synthesis of organic molecules such as glucose

Question 2

where does photosynthesis take place?

Answer 2

• in the chloroplasts of cells

- in leaves and other green parts of the plant

Question 3

summarise the equation of photosynthesis

Answer 3

water + carbon dioxide -> oxygen +glucose

Question 4

what is reduction?

Answer 4

• gain of electrons
• loss of oxygen
• gain of hydrogen

Question 5

what is oxidation?

Answer 5

• loss of electrons
• gain of oxygen
• loss of hydrogen

Question 6

what are the two stages of photosynthesis?

Answer 6

• light dependent stage

- light independent stage

Question 7

what absorbs the light in photosynthesis?

Answer 7

a pigment called chlorophyll

Question 8

what is excess food used for ?

Answer 8

• either stored

- used for making other substances such as cellulose, proteins, lipids which are used for growth

Question 9

describe the DNA in a chloroplast

Answer 9

circular

Question 10

where do the reactions for photosynthesis occur?

Answer 10

the thylakoid membranes of chloroplasts

Question 11

describe what and where a thylakoid membrane is

Answer 11

the membrane that surrounds chloroplasts

containing tightly packed chlorophyll

Question 12

define thee term phosphorilation

Answer 12

making ATP using light energy

Question 13

define the term photolysis

Answer 13

using light to split water molecule into hydrogen, electrons and oxygen

Question 14

define the term photionisation

Answer 14

loss of electrons from chlorophyll due to absorption of light

Question 15

what are the electrons produced in photolysis used for?

Answer 15

to replace the electrons lost from the chlorophyll

Question 16

in the light dependent stage of photosynthesis, what is the light energy used for?

Answer 16

• to excite electrons in chlorophyll which allows an inorganic phosphate ion to be added to to ADP (phosphorylation)
• to split water in to h+ ions and electrons (photolysis )

Question 17

describe the role of the elctron transport chain

Answer 17

• accept electorns from one molecule and donate them to another
• they cab use energy from excited electons to pump h+ions from one side of the thylakoid membrane t the other

Question 18

name a 5 carbon compound

Answer 18

ribulose bi phosphate

Question 19

name a 3 carbon compound

Answer 19

• triose phosphate

- glycerate 3 phosphate

Question 20

name a product of light dependent reaction that is use d in the light independent reaction?

Answer 20

• reduced NADP

- ATP

Question 21

name the enzymes associated with photosynthesis

Answer 21

-ribisco

Question 22

name a component that can be made from TP but is not part of the carbon cycle

Answer 22

amino acid

Question 23

name a product of the light independent reaction that is not sued in the light independent stage of photosynthesis

Answer 23

oxygen

Question 24

what are ATP and reduced NADP used for in the light independent stages?

Answer 24

reducing carbon dioxide from the atmosphere, building it into carbohydrates

Question 25

define the term limiting factor

Answer 25

on factor in such short supply it limits the rate of photosynthesis

Question 26

what are some limiting factors of photosynthesis?

Answer 26

• light intensity
• temperature
• co2 concentration