Answer: Vessels and tracheids.
- A Sieve tubes
- B Companion cells
- C Guard cells
- D Vessels and tracheids
Correct answer: D. Vessels and tracheids
Explanation: Xylem conducts water through dead, lignified vessels and tracheids.
Concept context
Internal tissue organisation: meristems, permanent tissues (xylem, phloem, parenchyma), and secondary growth. Frequently tested in NEET.