Unit notes and practice questions
Everything here is for unit 15 of the Grade 12 Agriculture textbook: what the chapter covers, the short notes, practice questions with their answers, and the lesson video where one exists.
Start here
A short video lesson on this chapter, made by Temari. It loads only when you press play.
Gender words, from sex to mainstreaming · 4 min · 2 past exam questions worked through
Tap a part to play the lesson from there.
10 multiple-choice questions written against this chapter, each with its answer and the reason. Try one before you open the answer.
Question 1
According to the textbook, what is the size range of clay particles in soil?
Answer: A Less than 0.002 mm
Why
The textbook specifies that clay particles have a diameter of less than 0.002 mm, whereas silt is 0.05 to 0.002 mm and sand is less than 2 to 0.05 mm.
Question 2
What is the definition of the bulk density of soil?
Answer: A The mass of the soil per unit volume of soil
Why
Bulk density is defined as the mass of the soil per unit volume of soil.
Question 3
What does the term Fanya-juu mean in the Swahili language?
Answer: A Throw uphill
Why
Fanya-juu is a Swahili phrase that means 'throw uphill'. It refers to an embankment constructed along the contour with a basin on the lower side.
Question 4
What is the difference between afforestation and reforestation?
Answer: A Afforestation plants new forests on land without trees, while reforestation regenerates lost forest cover.
Why
Afforestation is planting new forests across land that had no trees, whereas reforestation is the process of regenerating existing soil and forest balances.
Question 5
Which of the following is one of the three main principles of conservation farming?
Answer: A Minimum soil disturbance
Why
The three main principles of conservation farming are minimum soil disturbance, crop residue management, and crop rotation practices.
Question 6
In an area enclosure system for degraded land, how long should livestock grazing and human interference be stopped?
Answer: A For 2 to 3 years, until 50% natural grass cover is obtained
Why
Area closure requires that no livestock graze and no human interference is permitted for 2 to 3 years, until a 50% natural grass cover is achieved.
Question 7
According to the textbook, how many tons of soil per acre can heavy rainstorms splash?
Answer: A As much as 90 tons
Why
The textbook notes that heavy rainstorms can splash as much as 90 tons of soil per acre.
Question 8
Why are sand and silt referred to as the inactive part of the soil matrix?
Answer: A They do not contribute to the soil's ability to retain water or nutrients.
Why
Sand and silt are considered the inactive part of the soil matrix because they do not contribute to a soil's ability to retain soil water or nutrients.
Question 9
Which of the following belongs to indigenous mechanical soil and water conservation measures in Ethiopia?
Answer: A Stone bands and traditional cut-off drains
Why
Indigenous mechanical measures include cultivation on ridges, stone bands or barriers, traditional dams, cut-off drains, and terraces. Practices like intercropping, mulching, and alley cropping are indigenous biological measures.
Question 10
How does raindrop splash during heavy storms accelerate surface runoff on unprotected farmland?
Answer: A Splashed soil particles clog surface pores, reducing infiltration and increasing runoff.
Why
Most splashed soil particles do not leave the field immediately; instead, they clog surface pores. This reduces water infiltration and consequently increases water runoff and erosion.
The app holds 24 questions on this unit, marked as you go. These are the first 10.
Unit 15 runs from page 264 to page 271 of the Ministry of Education edition.
Ministry of Education edition, English, 302 pages
Temari turns this chapter into timed practice and marks it as you go, with an AI tutor to explain anything that did not land.
Start free
Temari.et is also an Android app, free on Google Play.
