Fundamentals of Plant Nutrition MCQs Quiz 5

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

 Sodium

 Chlorine

 Cobalt

 Silicon

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

 Magnesium

 Manganese

 Calcium

 Potassium

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

 Biochemical participation

 Growth enhancement

 Yield increase

 Soil availability

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

 Exchange cations

 Fix nitrogen

 Hold water

 Absorb light

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

 Limiting nutrient

 Essential nutrient

 Macronutrient

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

 Essential nutrient

 Macronutrient

 Micronutrient

 Beneficial nutrient

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

 Sodium

 Magnesium

 Nitrogen

 Phosphorus

8. Plants are classified as autotrophs because they _______________

 Obtain nutrients by decomposing organic matter

 Manufacture their own food using sunlight, water, and CO₂

 Depend on animals for their food

 Absorb nutrients directly from other plants

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

 Potassium

 Calcium

 Nitrogen

 Magnesium

10. Which of the following is an essential micronutrient?

 Zinc

 Cobalt

 Silicon

 Sodium

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