Movement of H2Othrough the cell wall isa)Apoplastb)Symplastc)Tonoplastd)None of the aboveCorrect answer is option 'A'. Can you explain this answer?

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Answer

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so , correct option is A

Answer

Answer

Movement of H2O through the cell wall is Apoplast

The movement of water through the plant cells involves the transport of water across various cellular compartments. One of the pathways through which water moves is called the apoplast pathway.

1. Apoplast Pathway:

The apoplast pathway refers to the movement of water through the cell walls and intercellular spaces of plant tissues. It is an extracellular pathway that allows water to move freely between adjacent cells without crossing any plasma membranes.

- Water enters the plant through the roots and moves through the cell walls of the root hairs, which are specialized extensions of root epidermal cells.
- From the root hairs, water moves into the cortex cells of the root through the cell walls and intercellular spaces.
- It continues to move through the cell walls and intercellular spaces of the cortex cells towards the endodermis.
- At the endodermis, the movement of water is regulated by the Casparian strip, a waxy layer that blocks the apoplast pathway.
- Water then enters the symplast pathway, which involves crossing the plasma membranes and moving through the cytoplasm of the cells.
- Once inside the symplast, water can move through plasmodesmata, which are small channels that connect adjacent cells.
- Finally, water reaches the xylem vessels, which are specialized structures responsible for long-distance water transport within the plant.

2. Symplast Pathway:

The symplast pathway involves the movement of water through the cytoplasm of plant cells. It requires water to cross the plasma membranes of the cells.

- Water enters the symplast pathway after crossing the endodermis in the root.
- It moves through the cytoplasm of the cortex cells and enters the xylem vessels.
- The symplast pathway allows for more selective control of water movement as it requires water to pass through the plasma membranes, where transport proteins can regulate the flow of water and solutes.

3. Tonoplast:

The tonoplast is the membrane that surrounds the vacuole in plant cells. It is responsible for regulating the movement of solutes, ions, and water into and out of the vacuole.

While the tonoplast plays a crucial role in maintaining the osmotic balance and storage of water in the vacuole, it is not directly involved in the movement of water through the cell wall.

Conclusion:

The correct answer is option 'A' - Apoplast. The movement of water through the cell wall is called the apoplast pathway, which involves the movement of water through the cell walls and intercellular spaces of plant tissues.

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