Question

Arrange root hair cell, inner cortical cell and mesophyll cell in ascending order of DPD.

• A. Mesophyll cell, root hair cell and cortical cell
• B. Cortical cell, mesophyll cell, and root hair cell
• C. Root hair cell, cortical cell and mesophyll cell
• D. Root hair cell, mesophyll cell and cortical cell

Answer 1

The correct option is C Root hair cell, cortical cell and mesophyll cell

DPD means deficit pressure diffusion. Roots absorb water through root hairs. For the absorption of water, there should be a concentration gradient between root hair and soil.

Root hair cells are creating concentration gradient and these are absorbing so water amount is more in this region so DPD is less. Cortical cells are present in the stem region so the amount of water is somewhat less in this region and DPD is more.

Mesophyll cells are present in leaves so here the amount of water is less and DPD is more and highest in this region.

So, the correct answer is 'Root hair cell, cortical cell and mesophyll cell'.