- A Pores embedded deep within the corky bark of mature woody perennial stems
- B Pores in leaf epidermis regulated by guard cell turgor - open when guard cells are turgid
- C A thin tubular extension of the epidermis that forms a single absorptive root hair
- D A specialized sugar-conducting cell type found within the phloem sieve tube
Correct answer: B. Pores in leaf epidermis regulated by guard cell turgor - open when guard cells are turgid
Explanation: Stomata are pores in leaf epidermis for gas exchange and transpiration. Guard cells surround each stoma. When guard cells absorb K+ (in light), water enters by osmosis, making them turgid and opening the stomata.
Concept context
Internal tissue organisation: meristems, permanent tissues (xylem, phloem, parenchyma), and secondary growth. Frequently tested in NEET.