Fundamentals of Plant Nutrition MCQs Quiz 6

1. Micropores are mainly responsible for _______

 Gas exchange

 Root penetration

 Water retention

 Rapid drainage

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

 Plant reproduction

 Plant water uptake

 Root elongation only

 Plant metabolism

3. Soil texture primarily influences nutrient dynamics through _______.

 Water color

 Cation exchange capacity

 Soil pH only

 Light absorption

4. Macropores in soil primarily facilitate _______.

 Nutrient adsorption

 Nutrient fixation

 Cation exchange

 Water drainage and mass flow

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

 High microbial activity

 High clay content

 Low permeability

 High leaching

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

 Silicon

 Phosphorus

 Nitrogen

 Potassium

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

 20

 17

 13

 10

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

 DNA synthesis

 Protein backbone formation

 Enzymatic regulation

 Structural

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

 Increasing CEC

 Restricting root growth

 Increasing soil temperature

 Enhancing microbial activity

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

 Carbon

 Cobalt

 Silicon

 Sodium

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Fundamentals of Plant Nutrition MCQs Quiz 6