Nutation is the bending movement of growing plants, especially the main stem. Thus, option D is correct.
<h3>What is nutation?</h3>
Nutation is defined as bending movements of stems, leaves, roots and other plant organs due to difference in growth in different parts of plant organ.
Nutation is also known as circumnutation and it is a particular class of nastic movements during which organ of plants bends in different directions, resulting in swinging motion.
Plant such as monocotyledons and dicotyledons shows plant nutation.
Nutation is the that takes place when force is absorbed at core and other parts in the direction of gravitational forces.
Therefore, nutation is the spiral movement of growing plants, especially the main stem.Thus, option A is correct.
Learn more about nutation here:
brainly.com/question/2180770
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