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?
- A. CAGTAGCAGC
- B. GTGTGTGTGT
- C. TTAAGGCCAA
- D. ACGCTCGCAC
- 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