Selected MCQ

Current Question
Natural selection acts directly on:
  • A. Genotypes only
  • B. Phenotypes affecting fitness
  • C. Mutations before expression
  • D. Species as indivisible units only
Correct Answer: B
Explanation:
Selection filters expressed traits that influence survival and reproduction.
Related Question 1
Which force acts on charged particles?
  • A. Gravitational
  • B. Magnetic
  • C. Electric
  • D. Nuclear
Correct Answer: C
Explanation:
Electric force acts on charges.
Related Question 2
Which force acts between charges?
  • A. Gravitational
  • B. Magnetic
  • C. Electric
  • D. Nuclear
Correct Answer: C
Explanation:
Electric force acts on charges.
Related Question 3
Which force acts between masses?
  • A. Electric
  • B. Magnetic
  • C. Gravitational
  • D. Nuclear
Correct Answer: C
Explanation:
Gravity acts on mass.
Related Question 4
Which species acts as Lewis acid?
  • A. NH₃
  • B. H₂O
  • C. BF₃
  • D. OH⁻
Correct Answer: C
Explanation:
BF₃ accepts electron pair.
Related Question 5
Which process most directly forms soil horizons over long timescales?
  • A. Instantaneous melting
  • B. Weathering combined with organic accumulation and leaching
  • C. Oceanic spreading
  • D. Lunar tidal forcing
Correct Answer: B
Explanation:
Soil profiles develop from parent material alteration plus biological and hydrologic processes.