MCQs Soil Science-4

1. With reducing soil pH, availability of __________ increased for plants

2. _______ is the role of root hairs in plants

3. ________ is the study of the origin, composition, distribution, and structure of rocks

4. The water held between field capacity and permanent wilting point is ___________

5. Salt affected soils are generally formed in ________________ climate.

6. Indus water treaty, between Pakistan and India, was signed in __________

7. ___________ element is the most abundant element in the Earth’s crust

8. If a solution has a pH of 5, the hydrogen ion concentration is ________ greater than a solution with a pH of 6.

9. In ______________  nitrogen and hydrogen gases combine under high pressure and temperature with a catalyst

10. ___________ describes the relationship between the amount of water a soil can hold and the tension with which that water is held

11. CO2 concentration in the soil is ________the CO2 in the atmosphere

12. ________ investigates how soil influences living things, soil flora and fauna

13. ________ is the study of soil formation, classification, and morphology

14. __________ is, a form of carbon, generated catalytically in the gas phase

15. The upper and most weathered part of the soil profile (A-horizons) is called _____

16. ___________ , not available to plants

17. If a solution has a pH of 5, the hydrogen ion concentration is ________ greater than a solution with a pH of 6.

18. With reducing soil pH, availability of soil __________ is reduced for plants

19. The soil area around the root zone is______________

20. ____________ is the main function of seeds