- A A specialized parenchyma cell found within the leaf mesophyll
- B A pore in bark for gas exchange in woody stems
- C A guard-cell structure derived from a modified stoma
- D A thin tubular extension forming a root hair
Correct answer: B. A pore in bark for gas exchange in woody stems
Explanation: Lenticels are small pores in the bark (periderm) of woody plants that allow gas exchange between internal tissues and the atmosphere, replacing stomata which are covered by bark.
Concept context
External structure of roots, stems, and leaves plus internal tissue organization. High marks in Class 11 and NEET.