I expect the carrots to follow shortly after. Growth is a complex process. After germination, primary and secondary growth occurs. Primary growth is when the plant begins sprouting and the shoot apical meristem lengthens from the top of the stem up. The tip of the growing shoot should look like this:
In primary growth, the root apical meristem allows for growth, like the shoot apical meristem, except underground. Secondary growth is when the plant widens. This type of growth utilizes lateral meristems. Cambiums are tissue layers that add to plant growth. The vascular cambium provides support for the shoot system and the cork cambium is an insulating layer that protects the plants. Monocots do not go through secondary growth.
Like the hormones in our endocrine system, plants utilize hormones to grow and develop. Cytokinins influence cell division and shoot formation. They also help delay senescence of tissues and work in correlation with auxins. Auxins are hormones that positively influence cell enlargement, bud formation, and root initiation. They affect cell elongation by altering cell wall plasticity.
Auxins play a role in phototropism. Phototropmpism is the growth of an organism in response to light. The cells on one side of the stem elongates, curving the plant towards the sunlight to obtain optimum
sunlight.
(My carrot plant experienced phototropism later in development.)
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