2022 Sec 3 Sc(Bio) EOY

The diagram below shows a cell. Which organelles in the diagram show that it is a plant cell?

• P and S only

• Q and R only

• Q, R and U only

• P, R and U only

Tags

NGSS.MS-LS1-2

Four agar blocks were placed into solutions of methylene blue as shown below. Which agar block will be completely stained first?

• A

• B

• C

• D

Four potato strips of equal sizes were freshly cut from a potato. Each potato strip is then immersed into four sucrose solutions of different concentrations, and labelled R, S, T and U respectively.

The graph below shows the percentage changes in mass of these four potato strips after 1 hour. Which of the following statement is correct?

• The cell sap of the potato has a lower water potential than solution R and solution S only.

• The cell sap of the potato has a lower water potential than solution T and solution U only

• The cell sap of the potato has a lower water potential than solution R only.

• The cell sap of the potato has a lower water potential than solution U only.

Tags

NGSS.HS-LS2-1

The diagram below represents the partial structure of three nutrient molecules L, M and N. Which of the following correctly identifies the molecules?

• A

• B

• C

• D

Tags

NGSS.HS-LS1-6

Four food samples were tested for the presence of fats, protein, reducing sugar and starch. Which food sample contains protein and fats only?

• A

• B

• C

• D

Potato cells contain an enzyme that breaks down hydrogen peroxide solution, releasing oxygen gas. Four experiments were carried out using the following apparatus. The table shows the contents of test-tube X in each experiment.

In which experiment was oxygen produced most rapidly?

• A

• B

• C

• D

Tags

NGSS.HS-LS2-4

The diagram below shows the appearance of the jelly with iodine. Which of the following solutions in the respective depressions would have given the results as shown?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-5

The diagram shows the human alimentary canal with labels for the functions of some of its parts. Which label is correct?

• A

• B

• C

• D

The graph shows the effect of pH on the rate of reaction of three different enzymes. What does the graph show?

• Each enzyme works best over a narrow temperature range.

• Each enzyme works bests at a different pH.

• Enzymes work best in acid conditions.

• Enzymes work best in alkaline conditions.

Which of the following matches the component of blood to its function?

• A

• B

• C

• D