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The fruit growth pattern in citrus is:

  • A.simple sigmoid curve
  • B.double sigmoid curve
  • C.triple sigmoid curve
  • D.fourth sigmoid curve

Answer: A

The key gives a simple sigmoid curve for the fruit growth pattern in citrus. A single sigmoid shows slow growth, then rapid growth, then a levelling off. Many textbooks class citrus as single sigmoid, though some describe it differently, and I could not confirm it from a source.

Double sigmoid is the pattern of stone fruits and guava, and triple and fourth are not growth patterns of fruits.

The key gives the single (simple) sigmoid pattern, in which growth is slow at first, rapid in the middle and slow again at the end. The double sigmoid pattern has a pause in growth between two rapid phases.

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