Question

Bordered pits are found in
(a) Sieve cells
(b) Vessel wall
(c) Companion cells
(d) Sieve tube wall

Answer 1

Hint: These are the sidewalls of vessel elements found in xylem tissue, the water-conducting tissue of plants. But: tracheids and vessel elements of xylem tissue are mainly involved in the actual transport: of water.

Complete answer:
The bordered pits are found in the vessel wall. Vessel elements are the building blocks of vessels that constitute the major part of the water transporting system in the plants. Xylem tissues consist of both the tracheids and vessel elements. Pits are present in the sidewalls of a vessel element and also in tracheids. Simple pits are having uniforms while bordered pits are having flask-shaped depressions.

Additional Information:
-Pits of vessel elements are having openings at both ends that connect individual vessel elements to form a continuous tubular vessel
-These end openings are called perforations or perforation plates having a variety of shapes.
-Simple pits are pits with simple opening or simple perforation.
-Bordered pits are pits with several round opening or foraminate perforation plates and a net-like pattern with many opening or reticulate perforation plates.
-Sieve cells are important for the function of phloem. They have pores through which the nutrients flow from one cell to another.
-Companion cells are found in the phloem of flowering plants. They are responsible for the movement of sugar and amino acids in and out of the sieve element.

So, the correct answer is 'Vessel wall.'

Note:
-Vessel elements are abundantly found in flowering plants (angiosperms) but absent from most gymnosperms like conifers. Vessel elements are the most feature distinguishing the "hardwood" of angiosperms from the "softwood" of conifers.
-Vessels form an efficient system for transporting water (including necessary minerals) from the basis to the leaves and other parts of the plant.
-Pits are the depressions or cavities formed within the cell membrane that's found within the sclerenchyma, thick-walled parenchyma cells, and therefore the tracheary elements, (i.e. vessels and tracheids).
-A vessel element is then a dead cell, but one that also features a function, and remains being protected by surrounding living cells.