Question

Anomalous growth in Bigonomia

Answer 1

Answer:

The word anomalous means deviating from the general or common order or type. Thus, the term, anomalous growth reflects a growth condition which is not commonly seen and which is present in a limited number of families or genera. This exercise explores a few examples of anomalous growth, bear in mind, there are many to choose from! The examples here illustrate aspects that are common - and include multiple cambia, included vascular bundles, and multiple vascular cylinders.

Explanation:

1. Examine the accompanying micrograph of Beta vulgaris root. As in the stem, the root of Beta shows anomalous secondary growth patterns. This is evidenced by the formation of successive supernumerary cambia each of which gives rise to a ring of vascular bundles and wide zones of parenchymatous tissue between these bundles. Note that the successive bundles are arranged more‑or‑less along the same radius as preceding ones.

2. Carrot roots undergo limited secondary thickening, but as can be seen in the accompanying photomicrographs, this secondary growth is unlike that seen in normal secondary growth in roots. The carrot, like beetroot, forms successive cambia, and multiple rings of vascular bundles.

3. Examine the accompanying micrograph of Dracaena stem. Can you locate the position of the cambium, secondary cortex, and "secondary" vascular bundles? Dracaena (the Dragon's blood tree) is the only monocot which has been shown to also have secondary growth in roots. Another alternative is to look at Cordyline stems to get an indication of the distribution of mature secondary tissue.

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