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maximum bordered pits are dound in trach...

maximum bordered pits are dound in tracheids of

A

monoctyledons

B

dicotyledons

C

pleridophytes

D

gymnosperms

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To answer the question regarding where the maximum bordered pits are found in tracheids, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Bordered Pits**: - Bordered pits are specialized structures found in the cell walls of tracheids. They are formed during the thickening of the cell wall, where lignin is deposited. 2. **Lignin Deposition**: - During the thickening process, lignin covers the primary cell wall of tracheids. However, it does not cover certain areas, which leads to the formation of pits. 3. **Characteristics of Bordered Pits**: - Bordered pits consist of small regions where the primary cell wall remains un-lignified. These pits are crucial for water transport and communication between adjacent tracheids. 4. **Location of Bordered Pits**: - Bordered pits are concentrated on the end walls of tracheids. They share a common membrane with the primary wall and middle lamella of adjacent cells. 5. **Primitive Character of Bordered Pits**: - The presence of bordered pits is considered a primitive characteristic, which evolved from lateral and alternate pits. This trait is more pronounced in certain plant groups. 6. **Comparison Among Plant Groups**: - Gymnosperms are more primitive than angiosperms (which include monocots and dicots). As such, gymnosperms exhibit a greater abundance of bordered pits compared to angiosperms. 7. **Conclusion**: - Given the evolutionary context and the characteristics of bordered pits, the maximum bordered pits are found in the tracheids of **Gymnosperms**. ### Final Answer: Maximum bordered pits are found in tracheids of **Gymnosperms**.
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