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Ecosystems — BIOLOGY STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceBIOLOGYEcosystems5 Marks
Question
  1. Explain primary productivity and the factors that influence it.
  2. Describe how do oxygen and chemical composition of detritus control decomposition.
✓

Answer

  1. Primary productivity: amount of biomass/organic matter produced per unit area over a time period by the plant during photosynthesis.

Factors: availability of nutrients/quality of light available/availability of water/temperature of the given place/type of plant species of the area/photosynthetic capacity of the plants.

  1. Oxygen increases rate of decomposition.

Chemical: decomposition is slowwhen chitin and lignin are present.

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