#1
Which soil type has the highest water retention capacity?
Clay soil
ExplanationClay soil has fine particles that hold water well.
#2
Which of the following is a primary macronutrient essential for plant growth?
Nitrogen
ExplanationNitrogen is crucial for various plant functions, including growth and photosynthesis.
#3
Which of the following is a characteristic of well-drained soil?
Good nutrient availability
ExplanationWell-drained soil allows for good nutrient availability to plants.
#4
Which soil particle size is the smallest?
Clay
ExplanationClay particles are the smallest among soil particles.
#5
Which soil texture feels gritty and does not hold water well?
Sandy soil
ExplanationSandy soil has a gritty texture and does not retain water well.
#6
Which soil pH level is considered neutral?
pH 7
ExplanationA pH level of 7 is considered neutral in soil.
#7
Which soil horizon is also known as the subsoil?
B horizon
ExplanationThe B horizon, or subsoil, is also known as the layer beneath the topsoil.
#8
What is the ideal pH range for most plants to grow?
6.0 - 7.0
ExplanationMost plants thrive in slightly acidic to neutral soil with a pH range of 6.0 to 7.0.
#9
Which seed classification method involves grouping seeds based on their size and shape?
Morphological classification
ExplanationMorphological classification categorizes seeds based on physical characteristics like size and shape.
#10
Which soil horizon contains the highest concentration of organic matter?
O horizon
ExplanationThe O horizon, or organic horizon, contains the most organic matter in the soil.
#11
Which of the following is NOT a factor affecting soil formation?
Photosynthesis
ExplanationPhotosynthesis is a process related to plants, not a factor in soil formation.
#12
Which of the following is NOT a function of soil organic matter?
Increasing soil pH
ExplanationSoil organic matter does not contribute to increasing soil pH; it primarily enhances fertility and structure.
#13
Which soil organism is responsible for converting organic matter into nutrient forms accessible to plants?
Bacteria
ExplanationBacteria play a crucial role in converting organic matter into plant-accessible nutrients.
#14
Which soil horizon contains weathered parent material but lacks significant organic matter?
B horizon
ExplanationThe B horizon, or subsoil, contains weathered parent material but lacks significant organic matter.
#15
What is the term for the process of breaking down rock and organic material into smaller particles by physical, chemical, or biological processes?
Weathering
ExplanationWeathering is the breakdown of rock and organic material into smaller particles through various processes.
#16
Which seed classification method involves grouping seeds based on their reproductive structures?
Endogenous classification
ExplanationEndogenous classification categorizes seeds based on reproductive structures.
#17
Which seed classification method involves grouping seeds based on their germination behavior?
Physiological classification
ExplanationPhysiological classification categorizes seeds based on germination behavior.
#18
Which seed classification method involves grouping seeds based on their internal structure?
Exogenous classification
ExplanationExogenous classification categorizes seeds based on internal structures.
#19
Which seed classification method involves grouping seeds based on their growth habit?
Endogenous classification
ExplanationEndogenous classification categorizes seeds based on their growth habits.