Xylem vessels are absent ina)Bryophytab)Angiosperms monocotsc)Angiosperm dicotd)GymnospermsCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

Bcoz, Gymnosperms grow in cold and dry climates an

d they don't have need for water as compared to angiosperms and the second reason is that they didn't evolve to have vessels and vessels are considered as an advanced element of xylem. But exceptionally these 3 clearly defined dissimilar genera of these gymnosperms Ephedra, Gnetum and Welwitschia.

Answer

A vessel element or vessel member (trachea) is one of the cell types found in xylem, the water conducting tissue of plants. Vessel elements (tracheae) are typically found in flowering plants (angiosperms) but absent from most gymnosperms such as conifers

Answer

The answer will be 1 & 2

Answer

Explanation:

Xylem vessels:
Xylem vessels are specialized structures found in plants that transport water and minerals from the roots to the rest of the plant. They are part of the xylem tissue, which also includes other cell types like tracheids and parenchyma cells. Xylem vessels are composed of elongated cells called vessel elements that are stacked end to end to form long tubes.

Presence of xylem vessels:
Xylem vessels are present in most vascular plants, including gymnosperms and angiosperms. However, some groups of plants do not possess xylem vessels.

Absence of xylem vessels in Bryophyta:
Bryophyta, which includes mosses, liverworts, and hornworts, are non-vascular plants. These plants lack true roots, stems, and leaves. Instead, they have simple structures called rhizoids that anchor the plant to the substrate and absorb water and nutrients. Bryophytes rely on diffusion and osmosis to transport water and nutrients from cell to cell, as they do not have specialized tissues like xylem and phloem.

Absence of xylem vessels in Angiosperms monocots:
Monocots are a group of flowering plants that have a single cotyledon (seed leaf) in their embryo. Examples of monocots include grasses, lilies, and orchids. While monocots do possess xylem tissue, they lack true vessels. Instead, they have xylem composed of tracheids and other specialized cells like parenchyma cells. These tracheids are narrower and have tapered ends compared to vessel elements, which are wider and have open ends. The absence of vessels in monocots is a characteristic feature that distinguishes them from dicots.

Absence of xylem vessels in Angiosperm dicots:
Dicots, or dicotyledons, are another group of flowering plants that have two cotyledons in their embryo. Examples of dicots include roses, sunflowers, and beans. Unlike monocots, dicots possess xylem vessels along with other cell types in their xylem tissue. The presence of vessels in dicots allows for more efficient water conduction compared to tracheids alone.

Absence of xylem vessels in Gymnosperms:
Gymnosperms are a group of seed-producing plants that include conifers, cycads, and ginkgoes. Gymnosperms do possess xylem vessels, making them similar to angiosperms in terms of their water transport system. The presence of vessels in gymnosperms allows for efficient water conduction and is one of the features that distinguish them from non-vascular plants like bryophytes.

In summary, xylem vessels are absent in gymnosperms (option D). While bryophytes, monocots, and dicots have different types of xylem tissue, gymnosperms possess vessels in their xylem.

Answer

Ans.  Can be A.

Answer

Mostly the vessels are absent in gymnospems .so i did not sufficient with your ans.

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