Sieve tube elements have no nucleus so that

  1. there is little obstruction to the flow of sap
  2. they can divide
  3. they can photosynthesise
  4. they can store water
Answer

A) there is little obstruction to the flow of sap

Fewer contents means easier flow. AS & A Level Biology · Topic 7 Transport in Plants · 7.1 Structure of transport tissues

Biology MCQ · More A Level Biology: Transport in plants MCQs · Practise