Fundamentals of Plant Nutrition MCQs Quiz 6

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

 Increasing CEC

 Increasing soil temperature

 Enhancing microbial activity

 Restricting root growth

2. Micropores are mainly responsible for _______

 Gas exchange

 Rapid drainage

 Root penetration

 Water retention

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

 Enzymatic regulation

 DNA synthesis

 Structural

 Protein backbone formation

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

 Root elongation only

 Plant metabolism

 Plant water uptake

 Plant reproduction

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

 Silicon

 Phosphorus

 Nitrogen

 Potassium

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

 Low permeability

 High clay content

 High microbial activity

 High leaching

7. Macropores in soil primarily facilitate _______.

 Cation exchange

 Nutrient fixation

 Water drainage and mass flow

 Nutrient adsorption

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

 Cobalt

 Sodium

 Silicon

 Carbon

9. Soil texture primarily influences nutrient dynamics through _______.

 Light absorption

 Soil pH only

 Water color

 Cation exchange capacity

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

 17

 20

 13

 10

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Fundamentals of Plant Nutrition MCQs Quiz 6