Which of the following tissues has dead cells?

Correct Answer: B

Rationale: Sclerenchyma is permanent tissue with dead cells which are long and narrow, closely packed without intercellular spaces. Sclerenchyma tissue is present in stems in the vascular bundles, roots, veins of leaves, hard covering of seeds and nuts.

Correct Answer: D

Rationale: Xylem vessels are long tube-like structure formed by a row of cells. The transverse walls between these cells dissolve to form continuous water channels.

Correct Answer: D

Rationale: Mucosa lines cavities exposed to the external environment, such as the digestive and respiratory tracts, with epithelial tissue.

Correct Answer: A

Rationale: Myocytes (muscle cells) develop from myoblasts, precursor cells specific to muscle tissue.

Correct Answer: B

Rationale: Covalent bonds involve electron sharing; peptide bonds are a specific type of covalent bond in proteins.