CHAPTER 3 CLIMATIC, EDAPHIC AND PLANT NUTRIENTS

What is the primary function of solar radiation in crop growth?

• It provides nutrients to the soil

• It controls the distribution of temperature

• It increases soil moisture

• It enhances wind velocity

Which of the following is NOT a climatic factor affecting crop growth?

• Soil temperature

• Water

• Wind velocity

• Solar radiation

What is the optimal temperature range for most agricultural plants?

• 60 to 80ºC

• 40 to 60ºC

• 15 to 40ºC

• 0 to 15ºC

Which nutrient is primarily responsible for the green colour of the leaf

• Phosphorus

• Calcium

• Nitrogen

• Potassium

What is the effect of high relative humidity on crops?

• Increases photosynthesis

• Decreases water requirement

• Increases pest and disease outbreaks

• Enhances nutrient absorption

Which of the following is a characteristic of xerophytes?

• High transpiration rate

• Waxy cuticle

• Large leaves

• Pneumatophores

What is the role of soil air in crop growth?

• Increases soil temperature

• Reduces soil moisture

• Facilitates the absorption of water by roots

• Provides nutrients directly to plants

Which of the following is a biotic factor affecting crop growth?

• Competition among plants

• Wind velocity

• Soil temperature

• Atmospheric gases

What is the primary function of potassium in plants?

• Increases leaf area

• Promotes root growth

• Improves drought resistance

• Enhances flower and fruit formation

Which type of nutrient is iron classified as?

• Primary macronutrient

• Secondary macronutrient

• Micronutrient

• Organic nutrient