Fundamentals of Plant Nutrition MCQs Quiz 5

1. Which of the following elements is beneficial for osmotic regulation in some plants but not essential?

 Magnesium

 Sodium

 Nitrogen

 Phosphorus

2. Which of the following is an essential micronutrient?

 Zinc

 Silicon

 Sodium

 Cobalt

3. Which of the following elements is essential due to its role in protein synthesis and amino acids?

 Nitrogen

 Calcium

 Magnesium

 Potassium

4. Which element is beneficial, particularly for legumes, due to its role in nitrogen fixation?

 Sodium

 Chlorine

 Silicon

 Cobalt

5. A plant shows improved growth after the addition of an element, but can still complete its life cycle without it. This element can be categorised as _______.

 Beneficial nutrient

 Macronutrient

 Essential nutrient

 Limiting nutrient

6. The criterion that ensures an element is directly involved in plant metabolism rather than acting indirectly is ____________________

 Biochemical participation

 Growth enhancement

 Soil availability

 Yield increase

7. Which macronutrient is part of the chlorophyll molecule and plays a key role in photosynthesis?

 Manganese

 Calcium

 Magnesium

 Potassium

8. A nutrient that enhances tolerance to abiotic stress but is not essential is classified as _______.

 Beneficial nutrient

 Essential nutrient

 Micronutrient

 Macronutrient

9. Plants are classified as autotrophs because they _______________

 Absorb nutrients directly from other plants

 Manufacture their own food using sunlight, water, and CO₂

 Obtain nutrients by decomposing organic matter

 Depend on animals for their food

10. Cation Exchange Capacity (CEC) refers to the soil’s ability to _______.

 Exchange cations

 Fix nitrogen

 Absorb light

 Hold water

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