Fundamentals of Plant Nutrition MCQs Quiz 6

1. Micropores are mainly responsible for _______

 Rapid drainage

 Gas exchange

 Root penetration

 Water retention

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

 Enzymatic regulation

 Protein backbone formation

 DNA synthesis

 Structural

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

 Root elongation only

 Plant water uptake

 Plant metabolism

 Plant reproduction

4. 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

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

 Cobalt

 Carbon

 Sodium

 Silicon

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

 Low permeability

 High clay content

 High leaching

 High microbial activity

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

 Silicon

 Nitrogen

 Potassium

 Phosphorus

8. Macropores in soil primarily facilitate _______.

 Nutrient fixation

 Cation exchange

 Water drainage and mass flow

 Nutrient adsorption

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

 Restricting root growth

 Increasing soil temperature

 Increasing CEC

 Enhancing microbial activity

10. Soil texture primarily influences nutrient dynamics through _______.

 Light absorption

 Cation exchange capacity

 Soil pH only

 Water color

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Fundamentals of Plant Nutrition MCQs Quiz 6