Practice Quiz

IB Biology Exam Prep - Question List

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91.
Bean leaves growing under constant environmental conditions in a laboratory raise and lower their leaves on a 26-hour cycle. This is an example of a:
  1. Phototropism.
  2. Circadian rhythm.
  3. Day-neutral behavior.
  4. Photoperiodic response.
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92.
Which of the following describes the triple response of seedlings that allows them to push up through the soil to the surface?
  1. Phototropism; ethylene emission; programmed cell deaths.
  2. Slowing of stem elongation; thickening of stem; horizontal growth of stem.
  3. Changes in turgor pressure; phytochromes; blue-light receptors.
  4. Variation in auxin concentrations; production of growth inhibitors; abscission layers.
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93.
Lichens obtain their carbon from the:
  1. Photosynthesis of green algae or cyanobacteria.
  2. Absorption of decomposing organic material.
  3. Accumulation of wind-borne particulate matter.
  4. Assimilation of solutes dissolved in precipitation.
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94.
After two prokaryotes undergo conjugation:
  1. One cell resides inside the other as an endosymbiont.
  2. Each cell divides and produces two daughter cells.
  3. The genome of one cell is altered by the process.
  4. Both cells remain attached to each other and begin to form a colony.
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95.
Roundworms are among the most primitive organisms that have a ?
  1. Nerve net.
  2. Digestive tract.
  3. Respiratory organ.
  4. Circulatory system.
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