Question

The correct sequence of water absorption by root hair cell is ________

• A. Osmosis \(\rightarrow\) imbibition \(\rightarrow\) diffusion
• B. Diffusion \(\rightarrow\) osmosis \(\rightarrow\) imbibition
• C. Imbibition \(\rightarrow\) diffusion \(\rightarrow\) osmosis
• D. Imbibition \(\rightarrow\) osmosis \(\rightarrow\) diffusion

Hint:

Sequence memory: First adsorption (imbibition), then entry (osmosis), then movement (diffusion).

Answer 1

The Correct Option is D

Concept:
Water absorption in root hair cells involves multiple processes that occur in a sequence from soil to cell interior.

Step 1: Understand imbibition. Initially, water is adsorbed by hydrophilic substances (cell wall components) through imbibition.

Step 2: Understand osmosis. Water then enters the cell across the plasma membrane due to osmotic gradient (from higher water potential in soil to lower inside the cell).

Step 3: Understand diffusion. Once inside, water diffuses further from cell to cell along concentration gradients.

Step 4: Conclusion. \[ \text{Imbibition} \rightarrow \text{Osmosis} \rightarrow \text{Diffusion} \]