1. Paper 1 Biology Exam Questions with markschemes to project
Cell Biology
Organisation
Infection and Response
Bioenergetics

2. TRIPLE ONLY
[6 marks]

3. TRIPLE ONLY

4. TRIPLE ONLY

5. TRIPLE ONLY

7. Mark Scheme

35. Potometer
28/11/2018

50. The diagram shows the apparatus the students used.
Q1. Some students investigated the effect of nitrates on the growth of seedlings.
The diagram shows the apparatus the students used.
The students set up three test tubes.
•        Tube A contained pure water
•        Tube B contained all the mineral salts that a seedling needs for healthy growth
•        Tube C contained all the mineral salts that a seedling needs for healthy growth, but no nitrate.
(a)     Why did the students set up tubes A and B?
(b)     To make it a fair test, what should each of the tubes, A, B and C, contain?

51. Mass of seedling after 14 days in g
The table shows the students’ results.
Tube
Solution in test tube
Mass of seedling after 14 days in g A
Pure water
0.10 B
All the mineral salts a seedling needs for healthy growth
0.45 C
All the mineral salts a seedling needs for healthy growth but no nitrate
0.30
(c)     Give two conclusions that you can make from the students’ results.

52. markscheme a) Tube A is a control tube
Tube B was to observe maximum growth when all factors available
b) The same volume of culture solution and the same seedling
c) Maximum growth is achieved when all the nutrients for growth are present.
Some growth is achieved with only water and few nutrients but not as much