Practice Quiz

IB Biology Exam Prep - Question List

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26. Red cabbage (Brassica oleracea capitata rubra) can be used as a natural pH indicator, its pigments change color in response to varying pH levels.

Pigments can be extracted from the leaves of red cabbage, and relative pH can be determined by adding drops of a liquid into the pigment, as noted in the following table:

pH 1-2 Pink/Acid
pH 3-4 Dark Red/Acid
pH 5-6 Violet/Acid
pH 7-8 Blue/Neutral-Base
pH 9-10 Blue-Green/Base
pH 11-12 Green-Yellow/Base

What can a student determine about the red cabbage solution as a natural indicator of pH?
  1. It turns pink in the presence of bases
  2. It turns green in the presence of acids
  3. It turns pink in the presence of acids
  4. It is a poor indicator of acids and bases
  5. It is yellow at a neutral pH
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27. Which of the following is considered to be an endocrine gland?
  1. Testis
  2. heart
  3. lung
  4. liver
  5. salivary gland
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28. Of the following, which of the groups below has the smallest number of species?
  1. Order
  2. Kingdom
  3. Phylum
  4. Class
  5. Genus
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29. Which of the following is the correct order of development of a fertilized egg?
  1. Zygote-morula-blastula-embryo
  2. Morula-blastula-zygote-embryo
  3. Zygote-embryo-blastula-morula
  4. Embryo-morula-zygote-blastula
  5. Zygote-blastula-morula-embryo
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30.
Which of the following is the site of protein synthesis?
  1. Cell wall
  2. Ribosomes
  3. Vacuoles
  4. DNA polymerase
  5. RNA polymerase
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