Fundamentals of Plant Nutrition MCQs Quiz 4

1. Plant nutrients considered essential must satisfy _______

 Arnon and Stout criteria

 Indirect enhancement of plant growth

 Partial involvement in metabolism

 Requirement for optimal yield alone

 Presence in large quantities

2. A nutrient satisfying all three essentiality criteria is termed _______

 Supportive nutrient

 Essential nutrient

 Optional nutrient

 Conditional nutrient

3. Organic matter improves nutrient availability primarily by _______

 Decreasing water holding capacity

 Increasing leaching

 Reducing microbial activity

 Increasing Cation Exchange Capacity

4. A plant showing yellowing (chlorosis) of older leaves first is most likely deficient in which nutrient?

 Calcium

 Iron

 Boron

 Nitrogen

5. Which nutrient is essential due to its role in cell wall formation?

 Calcium

 Nitrogen

 Phosphorus

 Potassium

6. Which of the following is an essential micronutrient involved in redox reactions?

 Iron

 Sulfur

 Phosphorus

 Calcium

7. According to essentiality criteria, a nutrient is essential if its deficiency _______.

 Can be corrected by another element

 Prevents completion of the life cycle

 Reduces plant height only

 Causes temporary wilting

8. The concept of essentiality in plant nutrition was first clearly defined by _______

 Daniel Israel Arnon

 Charles Darwin

 Dennis Robert Hoagland

 Justus von Liebig

9. If a plant completes its life cycle without a specific element, that element can be categorised as _______.

 Non-essential

 None of these

 Essential

 Toxic

10. Which nutrient is essential because it forms part of chlorophyll?

 Zinc

 Magnesium

 Manganese

 Iron

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