Growth by cell division that makes both ends of a plant longer but not wider is called

A secondary growth.
B annual ring growth.
C vascular growth.
D primary growth.
is it D?
thanks

Yes, you are correct. The growth by cell division that makes both ends of a plant longer but not wider is called primary growth.

To arrive at this answer, it helps to have a basic understanding of plant growth. In plants, there are two types of growth: primary growth and secondary growth.

Primary growth is responsible for the increase in length of a plant, both above and below the ground. It occurs at the tips of shoots and roots, and is primarily caused by cell division in the apical meristems located at these tips. This type of growth allows the plant to extend its stems and roots in order to reach resources such as light, water, and nutrients.

On the other hand, secondary growth is the growth that leads to an increase in the girth or width of a plant. This type of growth occurs in woody plants, such as trees, and is responsible for the formation of annual rings. Secondary growth is due to the activity of lateral meristems, specifically the vascular cambium and cork cambium, which add layers of new cells to the plant's trunk or stem, increasing its diameter.

In the given options, secondary growth (option A) and annual ring growth (option B) are both types of growth associated with secondary growth, and therefore not correct in this context. Vascular growth (option C) is a broad term that refers to the development and maintenance of the plant's vascular system but does not specifically describe the growth of the plant in terms of length or width.

Therefore, the correct answer is D, primary growth, as it describes the specific type of growth where the plant's ends elongate without increasing its width.