GED ADVANCED SCIENCE
COMPREHENSIVE ASSESSMENT
QUESTIONS AND ANSWERS
1. In a controlled experiment investigating the effect of nitrogen levels on plant height, what
role does the nitrogen concentration play?
A. Independent variable
B. Dependent variable
C. Control group
D. Extraneous variable
Answer: A
Conceptual Explanation: The independent variable is the factor that is intentionally
changed by the researcher to observe its effects.
2. Which of the following best explains why the rate of a chemical reaction generally
increases with a higher temperature?
A. Reactant particles move slower and collide less frequently
B. The activation energy of the reaction is lowered
C. The equilibrium constant decreases as temperature rises
D. Particles have higher kinetic energy, leading to more frequent and energetic collisions
,Answer: D
Conceptual Explanation: Increased temperature provides thermal energy, increasing
particle speed and the probability of effective collisions.
3. According to the second law of thermodynamics, what happens to the total entropy of an
isolated system over time?
A. It remains constant
B. It decreases as order increases
C. It fluctuates depending on the pressure
D. It increases as energy spreads out
Answer: D
Conceptual Explanation: The second law states that entropy, or disorder, in an isolated
system always increases over time.
4. In a Punnett square where a heterozygous tall plant (Tt) is crossed with a homozygous
recessive short plant (tt), what is the probability of the offspring being short?
A. 0%
B. 25%
C. 50%
D. 100%
Answer: C
, Conceptual Explanation: The cross Tt x tt results in 50% Tt (tall) and 50% tt (short).
5. What is the primary driver of plate tectonics on Earth?
A. Lunar gravitational pull
B. Centrifugal force from Earth’s rotation
C. Convection currents in the mantle
D. Atmospheric pressure changes
Answer: C
Conceptual Explanation: Heat from the core creates convection currents in the mantle,
which move the overlying tectonic plates.
6. Which cellular organelle is responsible for synthesizing proteins using mRNA instructions?
A. Mitochondria
B. Golgi apparatus
C. Ribosome
D. Lysosome
Answer: C
Conceptual Explanation: Ribosomes are the site of protein synthesis in all living cells.
COMPREHENSIVE ASSESSMENT
QUESTIONS AND ANSWERS
1. In a controlled experiment investigating the effect of nitrogen levels on plant height, what
role does the nitrogen concentration play?
A. Independent variable
B. Dependent variable
C. Control group
D. Extraneous variable
Answer: A
Conceptual Explanation: The independent variable is the factor that is intentionally
changed by the researcher to observe its effects.
2. Which of the following best explains why the rate of a chemical reaction generally
increases with a higher temperature?
A. Reactant particles move slower and collide less frequently
B. The activation energy of the reaction is lowered
C. The equilibrium constant decreases as temperature rises
D. Particles have higher kinetic energy, leading to more frequent and energetic collisions
,Answer: D
Conceptual Explanation: Increased temperature provides thermal energy, increasing
particle speed and the probability of effective collisions.
3. According to the second law of thermodynamics, what happens to the total entropy of an
isolated system over time?
A. It remains constant
B. It decreases as order increases
C. It fluctuates depending on the pressure
D. It increases as energy spreads out
Answer: D
Conceptual Explanation: The second law states that entropy, or disorder, in an isolated
system always increases over time.
4. In a Punnett square where a heterozygous tall plant (Tt) is crossed with a homozygous
recessive short plant (tt), what is the probability of the offspring being short?
A. 0%
B. 25%
C. 50%
D. 100%
Answer: C
, Conceptual Explanation: The cross Tt x tt results in 50% Tt (tall) and 50% tt (short).
5. What is the primary driver of plate tectonics on Earth?
A. Lunar gravitational pull
B. Centrifugal force from Earth’s rotation
C. Convection currents in the mantle
D. Atmospheric pressure changes
Answer: C
Conceptual Explanation: Heat from the core creates convection currents in the mantle,
which move the overlying tectonic plates.
6. Which cellular organelle is responsible for synthesizing proteins using mRNA instructions?
A. Mitochondria
B. Golgi apparatus
C. Ribosome
D. Lysosome
Answer: C
Conceptual Explanation: Ribosomes are the site of protein synthesis in all living cells.
