If a farmer wants to increase the health of his crops, he could apply a nitrogen-based fertilizer. why is nitrogen important to plants? a. nitrogen is a primary component of glucose sugar. b. nitrogen is the only element that plants need. c. nitrogen controls the uptake of water through plant roots. d. nitrogen is needed to build proteins and enzymes.

D. Nitrogen is needed to build proteins and enzymes.

Nitrogen is an essential element which is not produced inside the plant body but the plant life and metabolism is largely dependent on this element. All plants obtain the nitrogen from the soil. Nitrogen is required by the plants for the production of chlorophyll, which is required for the process of photosynthesis, synthesis of amino acids which are the building blocks of proteins , and nucleic acids. The amino acids and nucleic acids are required by the plants for proper growth and metabolism. Several enzyme composition is also based upon the nitrogen which performs functions in the cellular and molecular metabolisms.

Therefore, according to the above information Nitrogen is needed to build proteins and enzymes is the correct option.

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.  

the elements of art are the visual tools that the artist uses to create a composition. these are line, shape, color, value, form, texture, and space.

the principles of art and design are balance, contrast, emphasis, movement, pattern, rhythm, and unity/variety.