Bordered pits are very common among tracheids of -

a)
Gymnosperm

b)
Dicotyledons

c)
Pteridophytes

d)
Monocotyledons

Correct answer is option 'A'. Can you explain this answer?

Question

Bordered pits are very common among tracheids of -a)Gymnospermb)Dicotyledonsc)Pteridophytesd)MonocotyledonsCorrect answer is option 'A'. Can you explain this answer?

Answer

Bordered pits are common in the tracheids of some gymnosperms. Monocots and dicots also have bordered pitted tracheids but less than gymnosperms. So, option d should be correct.

Answer

During cell wall thickening, deposition of lignin covers the whole primary cell wall of tracheid, except at gaps termed as bordered pit-pairs. The pit pairs represent the small regions of un-lignified primary wall from two adjacent cells and are concentrated at end walls between cells, forming a pitted region called as pitted end walls. A pit pair shares a common membrane of primary wall and middle lamella and the raised wall around the pit aperture serve as border. Presence of bordered pits is considered as primitive character which has evolved into lateral, alternate pits as found in flowering plants. Since, gymnosperms are primitive to angiosperms (monocots and dicots), they have more abundant bordered pits. Since, pteridophytes are the first vascular plants, less advanced than gymnosperms, they have less developed bordered pits.

Therefore, the correct answer is option A

Answer

Bordered pits are specialized structures found in the tracheids of plants. Tracheids are elongated cells that are responsible for water conduction and mechanical support in plants. Bordered pits are small regions on the cell walls of tracheids that allow for the movement of water and dissolved substances between adjacent cells. They consist of a central pit chamber surrounded by a thickened region called the pit border.

Bordered pits are indeed very common among tracheids of monocotyledons. Monocotyledons, or monocots, are a group of flowering plants characterized by having a single cotyledon (embryonic leaf) in their seed. They include plants such as grasses, lilies, orchids, and palms.

The presence of bordered pits in monocotyledons is related to their evolutionary history and the specific adaptations they have developed for water transport. Monocotyledons typically have a scattered vascular bundle arrangement, where the xylem and phloem tissues are scattered throughout the stem or root. This arrangement allows for efficient water conduction in all directions.

In monocotyledons, the tracheids are the main water-conducting cells, as opposed to vessels found in dicotyledons. Tracheids have bordered pits on their walls, which aid in the lateral movement of water between adjacent cells. The pit border helps to maintain the structural integrity of the cell wall while still allowing for the passage of water.

On the other hand, dicotyledons, or dicots, are another group of flowering plants characterized by having two cotyledons in their seed. They include plants such as roses, sunflowers, and oak trees. Dicots typically have a ring-like arrangement of vascular bundles in their stems, with xylem located towards the center and phloem towards the periphery. In dicots, vessels are the main water-conducting cells, and they lack bordered pits.

In conclusion, bordered pits are indeed very common among tracheids of monocotyledons. This is because monocots have a scattered vascular bundle arrangement and tracheids are their main water-conducting cells. The presence of bordered pits in the tracheids allows for efficient lateral movement of water between cells while maintaining structural integrity.

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