Grade 10 Agriculture β Agricultural Land Quiz
1. What is 'agricultural land'?
Agricultural land is land used for crop production and livestock rearing. Industrial, residential and conservation lands serve different purposes.
2. Which type of soil is generally best for most crop production in Kenyan farms?
Loam combines sand, silt and clay with good organic matter and structure, holding moisture and nutrients well which suits most crops.
3. Which area in Kenya is generally most suitable for high-value crop production due to reliable rainfall and fertile soils?
Kenya's highlands receive more reliable rainfall and often have fertile soils suitable for maize, tea, vegetables and other high-value crops.
4. In land capability classes, which class is generally best for growing crops without major physical limitations?
Class I land has the fewest limitations (good soil, slope and drainage) and is most suitable for crop production without special conservation measures.
5. Which of the following is a main purpose of land preparation before planting crops?
Proper land preparation creates a suitable seedbed, reduces weeds, and mixes in organic matter to improve fertility and germination.
6. What is contour farming?
Contour farming follows the natural contours of a slope, slowing runoff and reducing soil erosionβan important practice on Kenyan slopes.
7. What is the main effect of soil erosion on agricultural land?
Erosion removes nutrient-rich topsoil, reducing the land's ability to support healthy crops and lowering yields.
8. Terracing on steep farmland is used mainly to:
Terraces break steep slopes into flat steps, slowing water flow, preventing gullies and making cultivation easier on hillsides.
9. What does 'fallow' mean in crop production?
Fallowing allows soil to recover nutrients and structure by resting it without cropping for a season or more.
10. For most common Kenyan crops, what soil pH range is generally best for nutrient availability?
A pH near neutral (6β7) allows most nutrients to be available to plants; very acidic or alkaline soils can lock nutrients out.
11. What is the main advantage of irrigation for Kenyan smallholder farms?
Irrigation provides reliable water during dry seasons, enabling cropping when rainfall is insufficient; other benefits depend on proper management.
12. What does 'land tenure' mean in the context of Kenyan agriculture?
Land tenure covers ownership and use rights (title, leases, customary rights) and affects investment in land and farming decisions.
13. Why is crop rotation practiced on agricultural land?
Rotating crops breaks pest and disease cycles and allows different plants to use and replenish soil nutrients, improving yields.
14. Which of the following is an example of an agroforestry practice used on Kenyan farms to protect agricultural land?
Agroforestry integrates trees into farms to reduce erosion, improve soil fertility, provide shade and additional products like fruit or timber.
15. Why is good drainage important on agricultural land?
Excess water fills pore spaces, reduces oxygen to roots and can cause root rot; proper drainage protects crop health.
16. What is the best practice to reduce water erosion on cultivated slopes?
Ground cover reduces raindrop impact and slows surface runoff, protecting soil from being washed away on slopes.
17. What causes salinity problems on irrigated agricultural land?
Irrigation water can deposit salts; without good drainage they concentrate in the root zone and reduce crop growth.
18. Which of these is a clear sign of land degradation on a farm?
Gullies indicate severe erosion and loss of productive soil, usually accompanied by falling yields β clear signs of degradation.
19. Which practice improves soil structure and fertility over time on smallholder farms?
Organic matter improves aggregation, water-holding capacity and nutrient supply, benefiting soil structure and fertility.
20. What is conservation tillage (minimum tillage)?
Conservation tillage leaves more residues on the surface, limits soil disturbance, and helps retain moisture and reduce erosion.
21. Which crop is well suited to Kenya's arid and semi-arid lands (ASALs) because it tolerates drought?
Sorghum is drought-tolerant and adapted to dry conditions common in ASALs; rice and potatoes need much more water.
22. Why are buffer zones of vegetation important along rivers on farms?
Riparian buffers trap sediments and nutrients, stabilise banks and protect rivers from farm runoff, improving environmental health.
23. What is meant by the 'carrying capacity' of agricultural land?
Carrying capacity refers to sustainable use levels beyond which the land is degraded; it guides stocking rates and cropping intensity.
24. What does 'land reclamation' involve on degraded farmland?
Land reclamation uses methods to reverse degradation so land becomes productive again, such as adding organic matter, terracing or reforestation.