PakQuizHub

1.Which type of climate is most favorable for optimal crop growth and yield?

2.What term describes extensive regions of the Earth that share similar climate, soil, and communities of plants and animals?

Earth's rocky outer layerBiosphereSoil layerCombination of Earth's crust and soil layer

3.What percentage of the Earth's fresh water is contained within lakes, reservoirs, and rivers?

0.75 percent2.75 percent0.3 percentNone of these

4.What term describes the process of water moving downward through the layers of soil?

5.What is the term for the quantity of water that oven-dried soil at 105°C can absorb when placed in an environment with 100% relative humidity?

6.Which group of plants requires a significantly large quantity of water for their growth?

7.What components are found in both plant and animal residues?

Carbohydrates such as sugars, cellulose, and hemicelluloseProteins and lignin compoundsLipids and waxy substancesAll the components listed above

8.From which country is the Journal of Plant and Soil published?

IndiaThe NetherlandsChinaFrance

9.What term describes the speed at which water penetrates into the soil?

LeachingCapillary waterInfiltrationAll of the above

10.What is the typical value for the particle (true) density of soil?

2.6 Mg/m³1.6 Mg/m³1.3 Mg/m³None of the above

11.How does the soil's ability to hold onto anions change with soil pH?

Rises as soil pH becomes more alkalineIncreases when soil pH becomes more acidicStays constant regardless of pHNo effect on anion retentionVaries depending on soil type

12.Which of the following minerals is a source of phosphorus?

13.Which of the following pairs is incorrectly matched?

Rain Gauge — Used to measure rainfallWind Vane — Determines wind directionSunshine Recorder — Measures hours of bright sunlightEvaporimeter — Measures wind velocityBarometer — Measures atmospheric pressure

14.What term describes the complete set of external factors influencing the life of organisms?

Variety of life formsSurrounding environmentTransitional ecological zoneCombination of biodiversity and ecotone

15.Typically, which type of land with slopes between 0-2% and 2-5% is recommended for specific uses?

Converted into grazing landsMaintained as woodland areasUsed for both grazing and forestryNone of the options listed

16.Since calcium is immobile within plants, deficiency symptoms first appear in young tissues. Which of the following describes the symptoms of calcium deficiency?

Terminal buds die and root tips show damageLeaves develop an unusual dark green colorationEarly dropping of flowers and buds along with weakened stemsAll of the aboveNone of the above

17.Potassium is crucial for the movement of water and nutrients within the plant's xylem. If potassium availability decreases, the transport of which substances is negatively affected?

18.What is the approximate daily amount of solid waste produced in Pakistan?

47,920 tonnes per day65,772 tonnes per day12,250 tonnes per dayAll of the above

19.What is the effect on saline-alkaline soil when it is irrigated with water?

The pH lowers while electrical conductivity risesBoth pH and electrical conductivity riseThe pH rises and electrical conductivity fallsNo change occurs

20.How are the negative effects of erosion categorized?

Damages occurring at the original locationDamages occurring away from the original siteBoth onsite and offsite damagesNeither of the above

Soil Science – MCQs