Question

............. are specialized parenchyma cells.
A. Sclereids
B. Fibres
C. Transfer cells
D. Tracheids

Answer 1

Hint: Parenchymal cells are living cells. Parenchymal cells are thin-walled and found in many places in the plants. When a plant matures its cells become specialized cells that perform certain functions.

Complete answer:
In this question, we have asked about the specialized parenchymal cells. As we know, parenchymal cells are living cells having thin walls and they are unspecialized. They are adaptable to various functions. The main functions of parenchyma cells are photosynthesis, secretion, food storage, and other plant functions.
So, our first option is sclereids. Sclerosis are non - living sclerenchyma cells having very thick cell walls. It is present in president xylem etc. The next option is fibers. Fibers are also sclerenchyma elongated cells. They are the same as sclereids but differ in shape. The 3rd option is Transfer cells. Transfer cells are specialized parenchyma cells having many folding in plasma membranes by which they have increased surface area. They facilitate the transport of sugars mainly from mature leaves to a sugar sink, often developing leaves or fruits. The next option is tracheids. Tracheids is a type of water-conducting cell in the xylem which lacks perforations in the cell wall. Among the four options only transfer cells are specialized parenchymal cells.

So the correct option is C. Transfer cells.

Note:
Phloem parenchyma cells, also called transfer cells and border parenchyma cells, are located near the branches and terminations of sieve tubes in leaf, where they also function in the transport of food mainly from leaves to growing tissues.