Question 1

In an aquatic environment, oxygen concentration depends on chemical and physical factors and is greatly

affected by many biological processes. These is much less dissolved oxygen (DO) in aquatic environments

than in dry air. In most aquatic environments, there are only 5 to 10 mL of dissolved oxygen in a liter of

water. Chemical and physical factors, such as salinity, pH, and especially temperature, can affect the DO

concentration and distribution. An experiment was done to study the effect of different salinity levels on DO

in water of varying temperatures. The results are below. Salinity is expressed in parts per thousand (ppt)

and is the content of dissolved salt in water.

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The oxygen that is dissolved in the water is used by aquatic organisms for

Options :

A : photosynthesis

B : cellular respiration

C : digestion

D : dehydration synthesis

E : chemosynthesis

Answer: B

Question 2

3x (4x2 + 2) − (8 − 2x3 + 10x) − 4 =

Options :

A : 10x3 − 4x − 4

B : 14x3 + 4x + 4

C : 14x3 − 4x + 12

D : 14x3 − 4x − 12

E : 14x3 + 16x − 12

Answer: D

Question 3

The process of breaking food particles down into the macromolecules that make them up is called

Options :

A : ingestion

B : cellular respiration

C : absorption

D : dehydration synthesis

E : digestion

Answer: A

Question 4

Has the highest boiling point.

Options :

A : H2O

B : H2S

C : H2Se

D : H2Te

E : HCl

Answer: A

Question 5

What would be the minimum angle of incidence so that a ray of light travelling from medium 1 of refractive

index 1.7 to medium 2 of refractive index 1.5 does not emerge out of medium 2?

Options :

A : sin−1(0.88)

B : cos−1(0.88)

C :

tan−1(0.88)

D : tan−1(1.13)

E :

sin−1(1.13)

Answer: A