5.2.1

Question 1

outline the relationship between photsynthesis and respiration
5.2.1(a)

Answer 1

products of photosynthesis are the reactants of respiration

Question 2

explain the difference between a heterotroph and a autotroph
5.2.1(a)

Answer 2

heterotroph gets organic molecules from eating other organisms
autotroph makes its own organic molecules

Question 3

when do plants respire
5.2.1(a)

Answer 3

all the time to make ATP

Question 4

when do plants photsynthesis
5.2.1(a)

Answer 4

they only photosynthesis during the day
at night they hydrolyse stored carbohydrate to release the glucose they need for respiration

Question 5

what is the compensation point
5.2.1(a)

Answer 5

the light intensity at which the rate of photosynthesis and respiration are the same

Question 6

what is the difference between a sun plant and a shade plant
5.2.1(a)

Answer 6

shade plants are adapted to a lower light intensity so there compensation points are lower
sun plants require a higher light intensity to reach there compensation point

Question 7

describe the structure of a chloroplast
5.2.1(b)

Answer 7

-consists of a double membrane with an intermembrane space
-fluid filled stroma which contains starch grains
-stacks of thylakoid make up a granum
-grana are connected by an intergranal lamellae

Question 8

how do different parts of the chloroplast maintain different internal conditions
5.2.1(b)

Answer 8

there are distinct regions
-fluid filled stroma
--stacks of thylakoid make up a granum
-different conditions can be maintained in different compartments so different reactions can take place

Question 9

where does the 1st and 2nd stage of photosynthesis take place
5.2.1(b)

Answer 9

1st-light dependant stage takes place in the grana-grana creates a large SA which allows maximum absoption of light. In the thylakoid membrane in chloroplasts
2nd-light independent stage-takes place in the stroma-contains enzymes

Question 10

within the thylakoid membrane of each chloroplast what is found
5.2.1(c)

Answer 10

photosystems
they are made of protein and photsynthetic pigments

Question 11

state the precise location of photosynthetic pigments in a chloroplast
5.2.1(c)

Answer 11

photosystems
in thylakoid membrane

Question 12

what is an accessory pigment
5.2.1(c)

Answer 12

the accessory pigments form a structure called the light harvesting complex
the light harvesting complex passes energy from photons of light down to the primary pigments in the reaction centre

Question 13

explain the oxidation of chlorophyll A
5.2.1(c)

Answer 13

1. an accessory pigments absorbs a photon of light
2. an electron in the accessory pigment becomes excited
3. energy from the excited electron is passed towards the primary pigment in the reaction centre
4. an electron in chlorphyll a becomes oxidised

Question 14

what are the 2 phases in TLC
5.2.1(c)

Answer 14

stationary-silica gel
mobile-solvent

Question 15

what determines how quickly components move in chromatography
5.2.1(c)

Answer 15

-more polar=adsorb stronger to stationary phase=travels less far
-more soluble in solvent=travels further

Question 16

light dependant and independent in booklet