Page 170 - SUBSEC October 2017_Neat

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02107032/CAPE/SPEC/KMS 2017

BIOLOGY

UNIT 1 -- PAPER 032
MARK SCHEME

Question 1. UK XS

(a) Construction of suitable columns.

Table should look similar to table below.

Initial Final
Sucrose Average
Concentration Strips Straight Straight Length
Length Length
1
0.1
2
3
0.2
4
3
5
0.3
6
7
0.4
8
9
0.5
10

Title -- 1 mark
Construction of table -- 2 marks

Final straight lengths for strips in various concentrations:

0.1M -- straight length should decrease very significantly

0.2M -- straight length should decrease marginally
5
0.3M -- no significant change in length
0.4M -- straight length should increase significantly

0.5M -- straight length will decrease

5 lengths correct -- 5 marks
4 lengths correct -- 4 marks
3 lengths correct -- 3 marks etc.

(b) Solution: 0.3M
1
Correct point -- 1 mark