Edexcel SNAB Unit 4 Quiz

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1. which equation describes the relationship between NPP, gross primary productivity (GPP) and respiration (R)?

  • NPP = GPP + R
  • R = GPP + NPP
  • NPP = GPP – R
  • GPP = R – NPP
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2. Oxygen is produced when water molecules are split in the process of

  • photolysis
  • hydrolysis
  • analysis
  • autolysis

3. What is the name of the organism that causes TB?

  • Mycobacterium tuberculosis
  • Macrobacterium tuberculosis
  • Microbacterium tuberculosis
  • Monobacterium tuberculosis

4. Which part of the skin that forms a physical barrier against infection by pathogenic bacteria?

  • Sebaceous gland
  • Erector pili
  • Epidermis
  • Malpighian layer

5. What is the name of the chemical that T helper cells produce to activate the T killer cells?

  • cysteine
  • cytokine
  • chromatin
  • cytosine

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