Question

Which among the following is incorrect about different cells in Phloem?

(a) Sieve tubes are tubular cells with perforated walls with large vacuoles, peripheral cytoplasm and without nucleus

(b) Companion cells are specialized parenchyma cells that help in regulation of metabolic activities

(c) Phloem parenchyma cells are elongated cylindrical cells that support sieve tubes

(d) Phloem fibers are living cells with extremely thick cell walls and provide mechanical strength

The question was posed to me by my college director while I was bunking the class.

This interesting question is from Flowering Plants Anatomy topic in section Anatomy of Flowering Plants of Biology – Class 11

Answer 1

The correct answer is (d) Phloem fibers are living cells with extremely thick cell walls and provide mechanical strength

The best I can explain: Sieve tubes are tubular cells with perforated walls with large vacuoles, peripheral cytoplasm and without nucleus. Companion cells are specialized parenchyma cells that help in regulation of metabolic activities. Phloem parenchyma cells are elongated cylindrical cells that support sieve tubes. Phloem fibers are dead cells with extremely thick cell walls and provide mechanical strength.