Botany MCQs

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fruit high in potassium is

  • A. banana
  • B. kiwi
  • C. peach
  • D. apple
  • Correct Answer: Option A

According to the equilibrium model of island biogeography, species richness would be greatest on an island that is

  • A. large and close to a mainland.
  • B. large and remote.
  • C. small and remote.
  • D. small and close to a mainland.
  • Correct Answer: Option A

The oak tree pathogen, Phytophthora ramorum, has migrated 650 km in 10 years. West Nile virus spread from New York State to 46 other states in 5 years. The difference in the rate of spread is probably related to

  • A. the lethality of each pathogen.
  • B. the mobility of their hosts.
  • C. the fact that viruses are very small.
  • D. innate resistance
  • Correct Answer: Option B

Which of the following examples would most accurately measure the dispersion of a population being studied?

  • A. counting the number of times a one-kilometer transect is intersected by tracks of red squirrels after a snowfall
  • B. measuring the distance between several burrows within a large prairie dog colony in a grassland
  • C. measuring the average distance between individuals and their nearest neighbor, and then analyzing the variation and comparing those measurements at larger scales
  • D. counting the number of zebras from airplane census observations
  • Correct Answer: Option C

Which of the following sequences is most likely to have indel mutations?

  • Correct Answer: Option B

The signaling molecule for flowering might be released earlier than usual in a long-day plant exposed to flashes of

  • A. far-red light during the night.
  • B. red light during the night.
  • C. red light followed by far-red light during the night.
  • D. far-red light during the day.
  • Correct Answer: Option B

How may a plant respond to severe heat stress?

  • A. by reorienting leaves to increase evaporative cooling
  • B. by creating air tubes for ventilation
  • C. by producing heat-shock proteins, which may protect the plant's proteins from denaturing
  • D. by increasing the proportion of unsaturated fatty acids in cell membranes, reducing their fluidity
  • Correct Answer: Option C

Charles and Francis Darwin discovered that

  • A. auxin is responsible for phototropic curvature.
  • B. red light is most effective in shoot phototropism.
  • C. light destroys auxin.
  • D. light is perceived by the tips of coleoptiles.
  • Correct Answer: Option D

Auxin enhances cell elongation in all of these ways except

  • A. increased uptake of solutes.
  • B. gene activation.
  • C. acid-induced denaturation of cell wall proteins.
  • D. cell wall loosening.
  • Correct Answer: Option C

If a long-day plant has a critical night length of 9 hours, which 24-hour cycle would prevent flowering?

  • A. 16 hours light/8 hours dark
  • B. 14 hours light/10 hours dark
  • C. 4 hours light/8 hours dark/4 hours light/8 hours dark
  • D. 8 hours light/8 hours dark/light flash/8 hours dark
  • Correct Answer: Option B