Tyloses are

(a) Tracheal plugs which plug the lumen of the vessels and tracheids

(b) Compound sieve plates

(c) Specialised secretory cells

(d) Laticiferous channels



The balloon-shaped structures tracheal plugs formed in the xylem vessels of heartwood, due to the intrusions of secondary xylem parenchyma are called tyloses.

Hence option a is the answer.

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