- A Specialized xylem vessel elements that are sometimes thought to enable unusually rapid, long-distance lateral water transport throughout
- B Tissue of tracheids and parenchyma surrounding the vascular bundle in gymnosperm leaves, facilitating lateral transport
- C A modified type of guard cell found mainly along the outer leaf margins of conifer species specifically
- D The dense, chlorophyll-bearing mesophyll layer that fills most of the bulk of a typical gymnosperm leaf
Correct answer: B. Tissue of tracheids and parenchyma surrounding the vascular bundle in gymnosperm leaves, facilitating lateral transport
Explanation: Transfusion tissue is unique to gymnosperm leaves, found surrounding the vascular bundle. It consists of tracheids (for water distribution) and parenchyma cells (for lateral transport of organic materials between mesophyll and vascular bundle).
Concept context
Internal tissue organisation: meristems, permanent tissues (xylem, phloem, parenchyma), and secondary growth. Frequently tested in NEET.