Which of the following tissues has dead cells? (a) Parenchyma (b) Sclerenchyma (c) Collenchyma (d) Epithelial tissue
Soln:
Answer is (b) Sclerenchyma
Explanation:
Parenchyma
Living tissues with thin cellwall with central vacuole and dense cytoplasm. Parenchyma cells are located in the soft parts of the plants such as pith and cortex.
Sclerenchyma
These are dead tissue which have thick cellwall due to deposition of lignin. They are generally located in the leaf veins, hard coverings of the seeds and can also be found surrounding the vascular bundle.
Collenchyma
Living tissues which have an elongated shape and thick cellwall in the corner. Collenchyma tissue can be located in the leaf stalks, below the epidermis etc.
Epithelial tissues
Epithelial tissues are the covering or protective tissues in the animal body. Allmost every organs and cavities are covered by Epithelium
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