Components of secondary cell wall:
Correct answer: B. Cellulose, hemicellulose, lignin
- A. Cellulose, hemicellulose, pectin
- B. Cellulose, hemicellulose, lignin
- C. Cellulose only
- D. Magnesium and calcium salts and pectin
Explanation
The secondary cell wall is a structure found in many plant cells, providing additional strength and rigidity beyond the primary cell wall. It is mainly composed of cellulose, hemicellulose, and lignin. Lignin is a key difference from the primary cell wall, as it adds significant rigidity and resistance to degradation. Option B correctly identifies these components. Option A includes pectin, which is primarily found in the primary cell wall. Option C lists only cellulose, omitting other crucial components. Option D includes pectin and mineral salts, which are not characteristic of the secondary cell wall composition.
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About Cell Structure and Function
Animal, plant, prokaryotic and eukaryotic cells are compared through their membranes, cell walls, nuclei and cytoplasmic organelles. The work includes the structures and functions of mitochondria, chloroplasts, ribosomes, endoplasmic reticulum, Golgi apparatus and lysosomes, as well as chromosome organization and the distinction between chromatin and chromosomes.
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