6.01

The three primary nutrients necessary for plant growth are:

• boron, calcium, and iron.

• chlorine, sulfur, and zinc.

• magnesium, manganese, and molybdenum.

• nitrogen, phosphorus, and potassium.

Calcium, magnesium, and sulfur are:

• macronutrients

• micronutrients

• primary elements

• secondary elements

A common symptom of a plant that has a phosphorus deficiency is:

• cupped or curled leaf tips

• a purplish color in older leaves.

• rotting fruit on young plants.

• yellow leaves with green veins.

Which elements do plants need in the smallest amounts?

• Macronutrients

• Micronutrients

• Primary elements

• Secondary elements

Angel selects a fertilizer that will promote good green growth for the leaves and stems of her houseplants. The fertilizer will most likely contain the primary element:

• chlorine

• copper

• nitrogen

• zinc

Which is true of macronutrients?

• All six are listed on the fertilizer label.

• They are present in the soil in the smallest amounts.

• They are used by the plants in large amounts.

• They are used by the plants in small amounts.

Which group includes micronutrients?

• Carbon, hydrogen, and oxygen

• Copper, manganese, and zinc

• Nitrogen, phosphorus, and potassium

• Sulfur, magnesium, and water

Sue uses a fertilizer that promotes early formation and growth of roots and increases the plant's hardiness and disease resistance vigor. Her fertilizer will most likely contain what primary element?

• Boron

• Chlorine

• Phosphorus

• Zinc

Which nutrient do plants need in the greatest quantity?

• Calcium

• Nitrogen

• Sulfur

• Zinc

What is the function of nitrogen in plant growth?

• Makes seeds

• Produces a healthy green color

• Produces a yellow color in leaves

• Protects plants against winterkill