Differentiate between primary and secondary growth in plants, as to the result of each, and where each

type of growth would be most likely to occur. What will be an ideal response?


Primary growth refers to growth in stem and root length. This vertical growth occurs only at
the root and shoot tips, specifically at the root and shoot apical meristems. Primary growth
results in the formation of primary tissues, such as primary xylem, primary phloem,
parenchyma, collenchyma, and sclerenchyma. Secondary growth refers to lateral growth; i.e.,
secondary growth results in an increase in the girth of the plant. Secondary growth results
from the activity of lateral meristems, which in term produce secondary tissues: the vascular
cambium produces secondary xylem and secondary phloem, and the cork cambium produces
cork parenchyma and cork cells. These last three tissues comprise the periderm which replaces
the epidermis in woody plants.

Biology & Microbiology

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