Fundamentals of Plant Nutrition MCQs Quiz 6

1. The role of potassium in plants is primarily _______.

 Enzymatic regulation

 DNA synthesis

 Structural

 Protein backbone formation

2. Soil texture primarily influences nutrient dynamics through _______.

 Soil pH only

 Light absorption

 Water color

 Cation exchange capacity

3. Macropores in soil primarily facilitate _______.

 Cation exchange

 Nutrient fixation

 Nutrient adsorption

 Water drainage and mass flow

4. According to the criteria for essentiality (established by Arnon and Stout in 1939), essential nutrients must be directly involved in _______.

 Plant metabolism

 Plant water uptake

 Root elongation only

 Plant reproduction

5. Micropores are mainly responsible for _______

 Water retention

 Gas exchange

 Root penetration

 Rapid drainage

6. Which of the following is NOT an essential macronutrient?

 Phosphorus

 Nitrogen

 Potassium

 Silicon

7. Sandy soils are more prone to nutrient losses mainly due to _______.

 High leaching

 Low permeability

 High clay content

 High microbial activity

8. Based on widely accepted agricultural and botanical science, ———elements are generally considered essential for the growth and development of higher plants.

 20

 13

 10

 17

9. Which of the following elements is essential for all higher plants?

 Silicon

 Sodium

 Carbon

 Cobalt

10. High bulk density or soil compaction, reduces nutrient uptake mainly by _______.

 Enhancing microbial activity

 Restricting root growth

 Increasing soil temperature

 Increasing CEC

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Fundamentals of Plant Nutrition MCQs Quiz 6