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level: STEM

Questions and Answers List

Question	Answer
Fragments or entire pieces of fibres, which are encircled by a parenchymatous sheath of cells possessing row of prisms of calcium oxalate.	Phloem fibres:
They are in groups, rounded and yellow; groups of __ or __ are surrounded by imperfect crystal sheath. Some are tangentially elongated with uniformly thickened walls.	Stone cells:
Numerous fragments of phloem tissue crossing medullary ray cells at right angles.	Medullary ray’s cells and phloem parenchyma:
Prisms and clusters of calcium oxalate in the cortical parenchyma and as well free in the powder.	Calcium oxalate crystal:
Occasionally fragments of __ with thin walled cells polygonal in surface view and containing brownish matter.	Cork