7/25/2019 Plants Questions-photosynthesis

1/4

1. The graph shows how the rate of photosynthesis is affected by different conditions.

4 % C O a t 2 5 C

4 % C O a t 1 5 C

0 . 0 3 % C O a t 2 5 C

0 . 0 3 % C O a t 1 5 C

L i g h t i n t e n s i t y

a t e o f p h o t o s y n t h e s i s

2

2

2

2

!a" #hat patterns can yo$ find fro% this graph&

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................

.....................................................................................................................................(5

!b" 'ow $sef$( co$(d this infor%ation be to a grower $sing g(assho$ses& )i*e reasons for

yo$r answer.

.....................................................................................................................................

.....................................................................................................................................(2

(Total 7 marks)

7/25/2019 Plants Questions-photosynthesis

2/4

2. )reen p(ants %a+e food in their (ea*es.

!a" ,ro% where do the (ea*es get the energy that they need to %a+e food& (1)

.....................................................................................................................................

!b" The graph shows the effect of te%perat$re on the rate of photosynthesis.

a t e o f p h o t o s y n t h e s i s

! a r b i t r a r y$ n i t s "

3 5

3 0

2 5

2 0

1 5

1 0

5

0

0 1 0 2 0 3 0

T e p e r a t $ r e ! C "

5 1 5 2 5 3 5

!i" -etween which te%perat$res is the rate of photosynthesis fastest& (1)

.............................. and .............................. C

!ii" $ggest why the rate of photosynthesis stays the sa%e between these two te%perat$res. (2)

............................................................................................................................

............................................................................................................................

............................................................................................................................

!iii" / greenho$se owner wants to grow (ett$ces as 0$ic+(y and cheap(y as possib(e in winter.

/t what te%perat$re sho$(d he +eep his greenho$se in order to grow the (ett$ces as

0$ic+(y and cheap(y as possib(e&

.............................. C

p(ain yo$r answer.

............................................................................................................................

............................................................................................................................

............................................................................................................................

(3)(Total 7 marks)

7/25/2019 Plants Questions-photosynthesis

3/4

3. (a) The equation describes the process of photosynthesis.

carbon dioide 3 .................. 3 (ight energy g($cose 3 ..................

!i" #rite in the na%es of the two %issing s$bstances.(2

!ii" a%e the green s$bstance which absorbs the (ight energy.

...........................................................................................................................(1

!b" !i" 5n bright s$n(ight6 the concentration of carbon dioide in the air can (i%it the rate of

photosynthesis. p(ain what this %eans.

...........................................................................................................................

...........................................................................................................................

...........................................................................................................................(2

!ii" )i*e one en*iron%enta( factor6 other than (ight intensity and carbon dioide

concentration6 which can (i%it the rate of photosynthesis.

...........................................................................................................................(1

(Total 6 marks)

7/25/2019 Plants Questions-photosynthesis

4/4

4. )reen p(ants are ab(e to %a+e their own food.

Co%p(ete each sentence by drawing a ring aro$nd the correct answer in the bo.

!a" )reen p(ants %a+e their own food d$ring the process of

diff$sion

photosynthesis

respiration

(1

!b" This process can be s$%%ari7ed by the e0$ation8

carbon dioide 3 water g($cose 3

%inera( sa(ts

(ight

oygen

(1

!c" The energy needed for this process is trapped for the p(ant by

ch(orophy((

g($cose

(ight

(1

!d" o%e of the food %ade by p(ants is stored as inso($b(e

ch(orophy((

g($cose

starch

(1

(Total 4 marks)