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Class 8 Soil Conservation revision questions and answers
Splash erosion can be prevented by
A. Use of gabions
B. Mulching
C. Terracing
D. Contour farming.
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1.
Which one of the following groups of activities includes a practice which DOES NOT help to conserve soil? A. Mulching, cover cropping, terracing, tree planting. B. Ridging, strip cropping, tree planting, contour farming. C. Cover cropping, mulching, bush clearing, terracing. D. Tree planting, growing grass, ridging, cover cropping.
2.
In the table below, which waste is NOT correctly matched with an item that can be made from it?
3.
The slowest way of recycling carbon in saw dust is by A. Putting the sawdust in the cowshed B. Putting the sawdust in the shamba. C. Using the sawdust in a jiko for cooking. D. Using the sawdust for making hardboards.
4.
Vegetation cover on land reduces soil erosion by A. Slowing the movement of running water. B. Increasing soil fertility C. Minimizing rainfall intensity D. Improving soil texture.
5.
Which one of the following materials DOES NOT pollute the environment? A. Sawdust. B. Broken pieces of glass. C. Plastic paper bags. D. Metal cans.
6.
Why is it necessary for farmers to leave strips of unploughed land between ploughed portions during seedbed preparation? A. To keep crop remains after harvesting. B. To provide grass for grazing. C. To control insect pests. D. To control soil erosion.
7.
Which one of the following practices is the most effective way of conserving soil on steep slopes? A. Terracing. B. Planting grass strips. C. Strip cropping. D. Ridging.
8.
Which one of the following crops is most suitable for use as a cover crop? A. Beans. B. Sweet potatoes. C. Cabbages. D. Irish potatoes.
9.
The MAIN reason why Jua Kali artisans use scrap metal is that A. They want to clean the environment. B. Raw materials are not readily available. C. Kenya has a lot of scrap metal. D. Products made from scrap metal are cheap.
10.
Construction of terraces is one method of controlling soil erosion. To which one of the following places should water from a terrace be discharged? A.A vegetated area. B. A nearby river. C.A nearby road. D. An unproductive part of the farm.
11.
How do trees help to conserve soil? A. Their roots hold soil particles together. B. Their leaves reduce the heat reaching the ground. C. Their leaves reduce the rate of evaporation. D. Trees stop the flow of surface water.
12.
Which one of the following structures of controlling soil erosion should be constructed at the upper end of a steep farm to divert surface run-off water to a grassed waterway? A. A cut-off drain. B. A terrace. C. A gabion. D. A trash line.
13.
Which one of the following waste products DOES NOT require processing before recycling? A. Waste paper. B. Scrap metal. C. Dirty used water. D. Rice husks
14.
Which one of the following materials can be recycled? A. Ash. B. Cow dung. C. Coffee husks. D. Scrap metals
15.
Which one of the following practices helps to conserve soil by preventing soil erosion? A. Crop rotation. B. Use of manure. C. Mulching. D. Planting cover crops.
16.
Which one of the following materials CANNOT be recycled? A. Rubber tyres B. Glass bottles. C. Candle wax. D. Saw dust.
17.
Which one of the following practices is used for controlling pollution in soil, water and air? A. Avoiding dumping cans and plastic materials. B. Treating chemical waste from factories. C. Burning rubbish in metallic or concrete structures. D. Avoiding excess use of fertilizers.
18.
The BEST way of handling tin cans after using the contents is by A. Burying them deep in the soil. B. Smelting and moulding them into other products. C. Throwing them in the pit latrine. D. Throwing them in the river.
19.
Which one of the following LEAST conserves soil? A. Mulching. B. Planting cover crops. C. Contour ploughing. D. Terracing.
20.
Which one of the following is the BEST method of managing plastic waste? A. Burning. B. Burying. C. Re-cycling. D. Re-using.
21.
Which one of the following is an effect of soil pollution? A. Formation of acid rain. B. Death of small animals. C. Interferes with photosynthesis. D. Causes respiratory diseases.
22.
Which of the following practices LEAST pollutes the soil? A. Spraying crops to kill pests. B. Burning plant wastes in the farm. C. Disposing of animal wastes in the farm. D. Burying plastics in the soil.
23.
Which of the following practices will conserve soil? A. Using dry grass for mulching. B. Burning vegetation on farms. C. Ploughing along the slope. D. Burying plastic materials
24.
Splash erosion can be prevented by A. Use of gabions B. Mulching C. Terracing D. Contour farming.
25.
Excessive use of herbicides and pesticides affect the soil by reducing the A. Number of animals in the soil B. Nutrients in the soil C. Humus content in the soil D. Water retention in the soil.
26.
Which one of the following pairs of materials will pollute soil? A. Saw dust and artificial fertilizer. B. Plastics and artificial fertilizer. C. Wood ash and saw dust. D. Plastics and iron filings.
27.
Which one of the following methods will mainly conserve soil and not water? A. Mulching. B. Terracing. C. Cover crops. D. Gabions.
28.
Which one of the following soil conservation measures conserves soil in the same way as mulching? A. Planting cover crops. B. Contour farming. C. Use of gabions. D. Terracing.
29.
Which one of the following practices will help to control soil pollution? A. Burning wastes in dump sites. B. Using organic fertilizers. C. Grouping wastes into categories. D. Planting cover crops.
30.
The following are some ways by which soil is conserved. (i) Reducing speed of surface runoff (ii) Trapping soil (iii) Reducing evaporation of soil water. (iv) Reducing impact of rain drops. Which two ways are as a result of contour farming? A.(i) and (ii) B.(ii) and (iii) C.(iii) and (iv) D.(i) and (iv)
31.
Use of cover crops for conservation of soil will work in the same way as A. Planting of trees. B. Mulching C. Terracing. D. Contour farming.
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