Question

Tracheary elements are
A) Vessels and tracheids
B) Sieve tubes and vessels
C) Sieve tubes, vessels and tracheids
D) Sieve tubes, sieve cells, vessels and tracheids

Answer 1

Hint:Tracheary elements are the xylem components. Xylem is a conducting tissue that is found only in vascular plants (those plants having vascular systems). Xylem helps in the conduction of water and dissolved minerals. The movement of the water is unidirectional that means from the roots to the upper parts of the plant.

Complete answer:
Tracheary elements:
>Tracheary elements are the dead, hollow cells which have patterned cell walls.
 >Tracheary elements consist of xylem vessels and tracheids.
> Xylem vessels and tracheids function as conductive hollow tubes for water and nutrient transport throughout the plant body.
Xylem tracheids:
>Xylem tracheids are the elongated cells present in the xylem of vascular plants.
> Xylem tracheids consist of dead cells.
> They help in transport of water and dissolved minerals.
Xylem Vessels:
>The xylem vessels are the long tubes present in the xylem of vascular plants.
>Xylem vessels also consist of dead cells.
>They help in transport and also provide mechanical support.
>Therefore, it has been clear from the above discussion that the tracheary elements are Vessels and tracheids.

Hence, option A is the correct answer for this question.

Note:Apart from the xylem there is another vascular tissue that is found in the vascular plants i.e. phloem. Phloem is responsible for the conduction of organic materials throughout the whole plants. The conduction through phloem is multidirectional. That means the organic substance gets transported from the factory sites to the growing parts of the plants and storage sites.