Plant fibres, xylem and phloem Quiz
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1. Which feature of sclerenchyma fibres gives them high tensile strength?
- A. A thin cellulose wall and a large nucleus
- B. Many chloroplasts in the cytoplasm
- C. Thick walls of lignified cellulose microfibrils
- D. Sieve plates in the end walls
2. Which cell is alive when functioning and has sieve plates?
- A. Sieve tube element
- B. Xylem vessel element
- C. Sclerenchyma fibre
- D. Pith cell
3. A fibre breaks when 2.0 kg is hung from it. What is the breaking force (g = 9.8 N kg⁻¹)?
- A. 0.20 N
- B. 2.0 N
- C. 196 N
- D. 19.6 N
4. What is the main function of xylem vessels?
- A. Translocating sucrose
- B. Transporting water and mineral ions, and support
- C. Photosynthesis
- D. Storing starch
5. Why do the xylem vessels in a toluidine blue section stain blue-green?
- A. They contain chlorophyll
- B. They have no cell walls
- C. They are living cells with many mitochondria
- D. Their walls contain lignin