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Class 7 Science: Soil fertility questions and answers

Class 7 Science: Soil fertility questions and answers. The answers are available in video format.

Lessons (17)

1. A farmer planted maize during a long rainy season in a well-drained soil. After the first weeding he observed the leaves turning yellowish, although the crops were well spaced and there was enough rainfall. What was the maize lacking? A. Phosphorus. B. Nitrogen. C. Sunshine. D. Water.
2m 12s
2. Which one of the following farm practices DOES NOT help in maintaining soil fertility? A. Weed control. B. Crop rotation. C. Manure application. D. Early planting.
2m 2s
3. Which one of the following farming activities would lower the soil fertility? A. Leaving the land under bush. B. Ridging of land before planting. C. Ploughing land across contours. D. Burying cereal stalks in the soil during ploughing.
3m 26s
4. A farmer noticed his crop growing slowly and the leaves showing purple colouration. What plant nutrient was lacking in the soil? A. Nitrogen. B. Phosphorus. C. Potassium. D. Sulphur.
1m 57s
5. Why should compost materials be turned three to four times during the preparation of compost manure? A. To reduce the smell of the compost materials. B. To encourage uniform rotting of compost materials. C. To allow fast water penetration in the compost heap. D. To check if the compost heap is ready for use.
2m 28s
6. Which one of the following practices would be most suitable for improving soil fertility on a flat farm land? A. Application of manures. B. Controlling soil erosion. C. Application of mulch. D. Draining away excess water.
1m 13s
7. A farmer has noticed that every season his maize crop develops the following problems: (i) The maize plants become shorter than normal (ii) The lower leaves turn yellowish. What should the farmer do to correct the problems in future? A. Plant maize early in the season. B. Plant maize using phosphatic fertilizer. C. Irrigate the maize crop every morning and evening. D. Apply a nitrogenous
1m 46s
8. Which one of the following will NOT change when loam soil is added to sandy soil? A. Texture. B. Capillarity. C. Colour. D. Fertility.
1m 43s
9. Which one of the following statements is NOT TRUE about manures? They A. Improve the ability of the soil to hold water B. Bind soil particles C. Release nutrients very fast to the soil D. Improve air circulation in the soil.
3m 4s
10. Which one of the following practices is an advantage to the soil? A. Ploughing across the contours. B. Disposal of vegetable refuse. C. Burning of crop remains. D. Use of herbicides.
2m 37s
11. Which one of the following ways of improving soil fertility will take the longest time for plants to get nutrients? When using A. Compost manure B. Compound fertilizer C. Farmyard manure D. Green manure.
3m 29s
12. The diagram below represents an arrangement of materials in a compost manure heap. In the diagram the layer of ash is represented by A.K B.L C.M D.N.
1m 54s
13. Which one of the following statements is TRUE about manures? They A. increase the growth of weeds B. release specific nutrients to the soil C. destroy micro-organism in the soil D. cause pollution of the soil.
3m 31s
14. Farmers apply farm yard manure to the soil to A. improve soil structure B. release nutrients needed by plants immediately C. provide specific nutrients D. provide nutrients in right amounts.
1m 34s
15. Which one of the following is a compound fertilizer? A. Muriate of potash B. Triple Super Phosphate C. Sulphate of Ammonia D. Mono Ammonium phosphate
3m 2s
16. Which type of manure is common on dairy farms? A. Green manure. B. Compost manure. C. Farmyard manure. D. Organic mulches.
2m 56s
17. The following are observations made on fertilizers and manures: (i) Nutrients are readily released (ii) Have nutrients in specific amounts. (iii) Improves soil structure. (iv) Benefits are long term. Which two observations are for manure? A.(i) and (ii) B.(ii) and (iii). C.(iii) and (iv) D.(i) and (iv)
3m 9s

Class 7 Science: Soil fertility questions and answers

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