Paper 1 Biology Exam Questions with markschemes to project

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Presentation transcript:

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

TRIPLE ONLY [6 marks]

TRIPLE ONLY

TRIPLE ONLY

TRIPLE ONLY

Mark Scheme

Potometer 28/11/2018

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?

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.

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