Question

Distinguish between Tracheary elements and sieve elements.​

Answer 1

Answer:

tracheary elements are water conducting tissues called as xylem and sieve elements are food conducting tissues called phloem

Explanation:

Xylem is the complex, dead and permanent tissue responsible for carrying nutrients and water, whereas phloem is the soft and permanent tissue play its role in transporting the food and other organic material produced by the green parts especially leaves by the process of photosynthesis.

Xylem and phloem are the two types of vascular tissues, present in plants and together constitute vascular bundles. Their function is to efficiently transport the materials which can be food, water, nutrients, organic materials, etc. between the stems, roots, and leaves of plants.

SIS FOR COMPARISON XYLEM PHLOEM

Meaning Xylem is the complex tissue of plants, responsible for transporting water and other nutrients to the plants. Phloem is living tissue, responsible for transporting food and other organic materials.

Contains Dead cells (parenchyma is the only living cells present in the xylem). Mainly contains living cells (fibers are the only dead cells in the phloem).

Comprises of Xylem vessels, fibre and tracheids. Phloem fibers, sieve tubes, sieve cells, phloem parenchyma and companion cells.

Found Xylem is located in the centre of the vascular bundle, deep in the plant. Phloem is located on the outer side of the vascular bundle.

Kind of movement Unidirectional. Bidirectional.

Role Xylem transports only minerals and waters from the roots. Phloem transports food materials that are prepared by the green parts of the plants to other parts of the plant.

Provide mechanical support. Does not provide mechanical support.

Other features Xylem is the dead tissues at maturity, but no cell contents. Phloem is the living tissue, but not with the nucleus.

Answer 2

Explanation:

ANSWER

Tracheary elements, both tracheids and vessels, are highly specialized cells. These cells are devoid of protoplast when mature. These non-living cells are elongated with lignified cell walls. The main difference between tracheids and vessels is that vessels have perforations at the end plates which make them a tube-like, long structure while tracheids do not have end plates.

So, the correct answer is 'Perforations of end walls.'