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When an oak tree is kept in a poisonous ...

When an oak tree is kept in a poisonous solution, that rises to the top of the tree, even then the tree is ready to take another supply of poisonous solution followed by uptake of even pure water. This shows that

A

Living cells are not involved in ascent of sap

B

Living cells play a major role in ascent of sap

C

Both xylem and phloem play a major role in ascent of sap

D

Living cells play 60% role and vessels of xylem play 40% role in ascent of sap

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The correct Answer is:
To solve the question regarding the behavior of an oak tree in a poisonous solution and its ability to take up pure water afterward, we can break down the explanation into several steps: ### Step-by-Step Solution: 1. **Understanding Ascent of Sap**: The ascent of sap refers to the upward movement of water and dissolved minerals from the roots to the upper parts of the plant, primarily through the xylem tissue. 2. **Role of Xylem**: Xylem consists of both living and non-living cells. The non-living cells, specifically the vessel elements and tracheids, are primarily responsible for the transport of water in the xylem. 3. **Effect of Poisonous Solution**: When the oak tree is placed in a poisonous solution, the xylem vessels can still transport this solution to the top of the tree. This indicates that the non-living components of the xylem are functioning to transport the liquid. 4. **Uptake of Pure Water**: After the poisonous solution, the tree can also take up pure water. This shows that the xylem can continue to function normally despite the previous exposure to a toxic solution, indicating that the system is resilient. 5. **Conclusion on Living Cells**: The fact that the tree can still transport liquids (both poisonous and pure) without any mention of the involvement of living cells suggests that the ascent of sap primarily relies on the non-living components of the xylem. Therefore, the living cells are not involved in this process. ### Final Answer: The correct conclusion is that living cells are not involved in the ascent of sap in this scenario.
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AAKASH SERIES-TRANSPORT IN PLANTS -EXERCISE II
  1. The cohesive force of water is due to :

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  2. A higher plant cell covered with cutin and suberin is placed in water....

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  3. Conduction of sap in plants occurs through:

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  4. The blockage of one or two tracheary elements in a tree may cause

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  5. This plant is ideal to demonstrate ascent of sap

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  6. The term ‘tensile strength’ represents that there is

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  7. In a branch cut from a rapidly transpiring plant, water snaps away fro...

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  8. When an oak tree is kept in a poisonous solution, that rises to the to...

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  9. Who among the following scientists first gave the starch sugar interco...

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  10. Chemical reactions are invariably associated with the transfter of ene...

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  11. A chemical widely used as antitranspirant

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  12. Which of the following theory gives the latest explanation for the ope...

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  13. Which one of following is not an antitranspirant?

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  14. Which one of the following will not directly effect transpiration?

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  15. When pheloem is removed by girdling

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  16. Although a girdled (upto bast ) three may survive for sometime , but i...

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  17. How does the removal of a ring of bark and wood from the trunk of a tr...

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  18. When stem of plant is girdled (ringed) :

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  19. Ringing (girdling) experiment cannot be performed in

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  20. The protoplasmic streaming hypothesis for food translocation has not b...

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