CA2 SBB
CA2 SBB Science Challenge
Test your knowledge with our engaging quiz designed to challenge your understanding of science concepts! This quiz covers various topics, including chemistry, biology, and the principles of chromatography.
- 16 thought-provoking questions
- A mix of multiple choice and open-ended queries
- Designed for students and science enthusiasts alike
1. X melts at 53 oC and boils at 100 oC. It is insoluble in water and does not react with water. State a method to separate a mixture of substance X and water.
Filtration
Simple distillation
Paper chromatgraphy
Crystillation
2. (a) Which of the bank notes is not a forgery?
G
H
I
J
2 (b) Which of the bank notes contains a pure ink?.
F
G
H
I
2 (c) Besides using chromatography, suggest how else the scientists can prove that the bank note in (b)(i) is a pure ink.
Use filitration to see if there is any residue left
No other methods can be used
Boil the ink to see if it has a fixed boiling point.
Use UV rays to detect any impurities
2 (d) Suggest why water is not used as a solvent to use for this chromatography in comparing the inks in bank notes.
Water will destroy the ink
A stronger solvent should be used
Inks in bank notes cannot react to water
Inks in bank notes are insoluble in water
2 (d) Explain why the starting line is drawn in pencil.
Pencil can be erase easily if drawn wrongly
Pencil contains carbon. Carbon is a pure substance, cannot be separated Does not intefer with results.
Pencil does not leave any marking on the paper chromatogram
Pencil allows the ink to travel faster up the paper chromatogram
3 (a) Which type of evaporation would be suitable to extract pure solute A from the mixture solute A and water?
Y
Z
Question 4(a)
A: cytoplasm B: nucleus C: cell wall
A: cytoplasm B: cell membrane C: nucleus
A: cytoplasm B: nucleus C: cell membrane
A: vacuole B: cell membrane C: cytoplasm
4 (b) How is the structure of red blood cell differs from a white blood cell.
Absence of nucleus
Absence of cytoplasm
Absence of cell membrane
Absence of small vacuoles
4 (c) Which of the following is not an explanation of the structure of red blood cell to its perform its function.
No nulceus to carry more oxygen
Contain haemoglobin which can combines with oxygen.
No nucleus to pack more haemoglobin.
Biconcave to increase surface area to volume ratio for diffusion of gases
5 (a) Identify the type of cells A and B
A: red blood cell B: root cell
A: blood cell B: nerve cells
A: red blood cell B: root hair cell
A: xylem cell B: nerve cells
5 (b) Which part contains the chromosome.
Nucleus
Cytoplasm
Chloroplast
Large central vacuole
6 (a) Explain what labour of division is.
Many cells come together to perform a task more efficiently
Breakdown of workload into smaller and more specific tasks for maximum efficiency
Each cell is modified to perform a specialised task
Combining of workload into more specific tasks for maximum efficiency
6 (b) Which of the following is not an example of 'division of labour' in cell
Nucleus
Chloroplast
DNA
Vacuole
6 (c) Which of the following is not an example of 'division of labour' in an organsim?
Red blood cell
Nerve cell
Root hair cell
Animal cell
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