Use this pic to answer the questions below 1. The vascular bundle from a lycophy

Question

Use this pic to answer the questions below

1. The vascular bundle from a lycophyte stem is shown below. What is the most probable identity of the small-diameter cells labeled “B”

a) sclerenchyma fibers

b) sieve elements

c) tracheids

d) vessels

2. The vascular bundle from a lycophyte stem is shown below. Why do the large-diameter cells labeled “C” in the photomicrograph stain darkly?

a) because the cell wall contains a waxy cuticle

b) because they have lignified secondary cell walls

c) because the cytoplasm is rich in saturated fatty acids

d) because the cytoplasm absorbs and concentrates the stain

3. What morphology is evident in the vascular bundle from the lycophyte stem shown below?

a) solenostele

b) plectostele

c) actinostele

d) haplostele

Explanation / Answer

1. The answer is b. Sieve elements

2. The answer is b) because they have lignified secondary cell walls
Safranin binds to dead cells mostly, as the xylem is composed with dead cells, it gives stain there.

3. The answer is d) haplostele
The haplostele is one type of protostele. In haplostele the vasuclar tissue is composed with only one type of tissues.

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