Chlorophyll is found in plant leaves and absorbs light from the sun to enable plants to perform photosynthesis. magnesium is an important component of chlorophyll. the concentration of magnesium ions is higher in the root-hair cells of plants than in the soil. which mechanism of ion uptake would best enable a plant to produce a steady supply of chlorophyll? (a) osmosis(b) diffusion(c) passive transport(d) active transport

The correct answer will be option-D.

Explanation:

Magnesium is a macro-nutrient element needed by the plant in high concentration as it is involved in the formation of chlorophyll structure, the cell membrane stabilization and the metabolism of carbohydrates.

The magnesium is absorbed from the soil as Mg ⁺² ions due to the differences in the concentration of the ions between the soil and plants. The main mechanism for absorption of these ions is passive diffusion which leads the movement of ions from low concentration to high concentration.  

In the given question which states that if magnesium concentration is higher in the root hair cells than in the soil then these ions will move in the roots via special mechanism through transport proteins which require energy in the form of ATP to lead the movement of ions against a concentration gradient. This movement of ions is known as active transport.

Thus, option- D is the correct answer.

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

explanation:

answer-

the statement that f(x) = |x+a| + b has exactly one x-intercept is sometimes correct.

solution-

it solely depends on b, whether the function will have one or two or zero x intercept.

this plot of the given function, f(x) = |x+a| + b will be the basic absolute value graph i.e v shape, with vertex translated to (-a, b), instead of origin.

1-   if b is zero, the graph will have exactly one x-intercept, at x= -a

2- if b is positive, the whole graph will be above the x-axis, hence it will have no x-intercepts.

3- if b is negative, the graph will be below the x-axis, hence it will have two x-intercepts.

∴ the statement is sometimes true.