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Unformatted text preview: icots (two
cotyledons in the seed). A number of structural differences make these two groups fairly easy to tell apart:
• monocots: 3 petals and 3 sepals (though the sepals may look like the petals), parallel veins in the
leaves, fibrous root system.
• dicots: flower parts in 4’s, 5’s, and 6’s, always has sepals distinct from petals, leaves have a network of
veins, taproot system.
• All plant cells arise from meristem cells. These are rapidly dividing, undifferentiated cells found at the shoot
tips, root tips, edges of leaves and petals, and in a cylinder around many stems. In general, plants grow
from the tips outward.
• Apical meristems are found at the top shoot and the tip of the leading root. Lateral meristems are found in
the stem of the plant, and are also called cambium.
• Primary growth in plants is due to division of apical meristem cells. Primary growth makes shoots grow taller
and roots grow longer.
• Secondary growth occurs by the division of lateral merist...
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