Xylem, phloem and sclerenchyma Quiz
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5 questions, one answer each
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1. Which cell has a wide lumen, no end walls and lignified walls?
- A. Sieve tube element
- B. Sclerenchyma fibre
- C. Xylem vessel
- D. Companion cell
2. Which tissue has a supporting role only?
- A. Sclerenchyma fibres
- B. Xylem vessels
- C. Phloem sieve tubes
- D. Companion cells
3. A student calibrates a graticule so that 100 µm on a stage micrometer covers 25 divisions. A xylem vessel is 9 divisions wide. What is its width?
- A. 11 µm
- B. 25 µm
- C. 44 µm
- D. 36 µm
4. Why do sieve tube elements need companion cells?
- A. Companion cells provide ATP because the sieve tube element has little cytoplasm
- B. Companion cells carry water into the sieve tube
- C. Companion cells provide lignin to strengthen the walls
- D. Companion cells remove the end walls
5. In a young stem, where do the sclerenchyma fibres of a vascular bundle lie?
- A. Inside the xylem at the centre
- B. Between the xylem and phloem
- C. On the outer side of the phloem
- D. In the pith