An acorn sprouts and a baby oak tree begins to grow.It grows up to form a shoot and branches,and grows down to form branched roots.The best description for this oak tree's current growth is

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Quizplus · Accepted Answer

Primary growth refers to the lengthening of stems and roots through cell division and elongation at the tips of the plant. This is exactly what is happening as the oak tree grows upward and downward. Secondary growth, on the other hand, refers to the thickening of stems and roots through the production of more cells in the lateral meristems, which is not happening yet in this young oak tree. Apoptosis is programmed cell death, geotropism is the response to gravity, and heliotropism is the response to the sun, none of which are relevant to the oak tree's current growth.

An Acorn Sprouts and a Baby Oak Tree Begins to Grow.It