Which one among the following is living and non-nucleated at maturity

Which one among the following is living and non-nucleated at maturity ?

[amp_mcq option1=”Sieve tubes” option2=”Companion cells” option3=”Collenchyma” option4=”Parenchyma” correct=”option1″]

This question was previously asked in

UPSC Geoscientist – 2024

Sieve tubes are component cells of the phloem, responsible for the transport of sugars. At functional maturity, sieve tube elements are living cells but have lost their nucleus, vacuole, and other major organelles. They rely on associated companion cells for metabolic support. Companion cells, collenchyma, and parenchyma are all living and nucleated at maturity.

The absence of a nucleus and other organelles in mature sieve tube elements allows for efficient transport of phloem sap. Despite lacking a nucleus, they are considered living because they maintain a functioning plasma membrane and some cytoplasmic components, supported by the companion cells which are connected to them via plasmodesmata.

More similar MCQ questions for Exam preparation:-