Secondary cell wall of sclerenchyma cells is impregnated with_________________?
Correct answer: C. Lignin.
- A. Cellulose.
- B. Peptidoglycan and murein.
- C. Lignin.
- D. Pectin.
Explanation
Sclerenchyma cells have thick secondary walls impregnated with lignin, making them hard and mechanically strong after maturity. Cellulose is also present in the wall, so option a may seem attractive, but lignin is the characteristic strengthening impregnation.
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Animal and plant cells share a plasma membrane, cytoplasm, nucleus, ribosomes, mitochondria and endoplasmic reticulum, but plant cells also have a cellulose cell wall, chloroplasts and a large permanent vacuole. Questions cover organelle structure and function, differences between the two cell types, and how membranes control movement of substances.
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