In angiosperms, root hairs arise from which one of the following regions of the root?

Related Formula

Bulliform cells (motor cells in monocot leaf epidermis): Flaccid (water stress) arrow$\rightarrow$ Inward rolling of leaf arrow$\rightarrow$ Reduced exposed surface area.

Core Logic

In grasses, large, empty, colorless epidermal cells called bulliform cells absorb water to become turgid (exposing leaf surface) and lose water under drought stress to become flaccid, causing the leaves to curl inward to minimize water loss.

Step 1: Conclusion

The main function is to minimize water loss during water stress. Option (3) is correct.

Pattern Recognition

Bulliform cells in grasses = Leaf curling = Minimize transpiration/water loss.

Chapter Mix

Class 11 Biology: Anatomy of Flowering Plants

Related Formula

Conjunctive tissue: Between xylem & phloem. Casparian strips: Suberin in endodermis. Subsidiary cells: Near guard cells. Starch sheath: Endodermis in dicot stem.

Core Logic

• Conjunctive tissue: Parenchymatous tissue lying between xylem and phloem arrow$\rightarrow$ III
• Casparian strips: Suberin deposition on endodermal walls arrow$\rightarrow$ IV
• Subsidiary cells: Specialized epidermal cells surrounding guard cells arrow$\rightarrow$ I
• Starch sheath: Endodermis of dicot stem rich in starch grains arrow$\rightarrow$ II

Step 1: Match Verification

Matching layout: A-III, B-IV, C-I, D-II. Option (3) is correct.

Pattern Recognition

Subsidiary cells = Vicinity of guard cells (C-I). Casparian strips = Suberin (B-IV). Matches option (3).

Chapter Mix

Class 11 Biology: Anatomy of Flowering Plants