Consider the following biomes: Tropical Rainforest $(P)$; Tundra $(Q)$; Desert $(R)$ and Coastal zone $(S)$. Choose the most probable descending order of Net Primary Productivity of these biomes.

• Correct answer
  A

  $P \gt S \gt Q \gt R$
• B

  $Q \gt P \gt S \gt R$
• C

  $R \gt Q \gt S \gt P$
• D

  $P \gt Q \gt S \gt R$

Hence, the correct answer is option: 'A'.