Plant Growth Factors Unit Practice Test

Which nutrient is responsible for root growth and development?

• Nitrogen (N)
• Phosphorus (P)
• Calcium (Ca)
• Potassium (K)

Which plant hormone hastens the ripening of fruit?

• Gibberellins
• Ethylene
• Auxins
• Cytokinins

Which plant nutrient is responsible for the formation of chlorophyll and the quick "greening up" effect on plants?

• Magnesium (Mg)
• Iron (Fe)
• Sulfur (S)
• Potassium (K)

Which of the following best describes the term, hardiness?

• The ability of a plant to withstand high temperatures.
• The ability of a plant to withstand cold temperatures.
• The ability of a soil to retain water.
• The ease with which air and water move through the soil profile.

All of the following are symptoms of plants receiving less than optimal sunlight EXCEPT ______.

• Compact growth
• Dull colored leaves
• Slow growing plants
• Stretching

Which of the following best describes the term, water - holding capacity?

• The ease with which water and air move through the soil.
• The ability of the soil to retain water.
• The ease with which a soil may be tilled after a rain event.
• All of the above

Growth - regulating substances in plants are known as __________________.

• Allelopathy
• PGRs
• Inhibitors
• Pinching

Carbon dioxide is needed for which plant process?

• Respiration
• Transpiration
• Photosynthesis
• All of the above

All of the following are examples of how blue light impacts plant growth EXCEPT ________________.

• Reduces stem length
• Promotes seed germination
• Promotes stem strength
• Increases branching

Which nutrient is responsible for promoting vegetative growth (leaves / stems)?

• Nitrogen (N)
• Potassium (K)
• Calcium (Ca)
• Phosphorus (P)