(a) List four factors that affect the type of soil formed at a place (2 marks) (b) State: (i) two agricultural uses of land (ii)a two non-agricultural uses ...
Question 1 Report
(a) List four factors that affect the type of soil formed at a place (2 marks)
(b) State: (i) two agricultural uses of land
(ii)a two non-agricultural uses of land. (4 marks)
(c) Sate two functions and two deficiency symptoms of each of the following nutrients in crops: (i) nitrogen; potassium. (8 marks) \
(d) Mention two ways in which soil structure Is important in agriculture. (2 marks)
Answer Details
(a) Four factors that affect the type of soil formed at a place [2 marks]
- Nature of the parent rock (parent material).
- Climate (rainfall and temperature).
- Living organisms (vegetation and soil organisms).
- Topography (relief) and length of time of soil formation.
(b) Uses of land [4 marks]
- (i) Two agricultural uses: for growing crops (crop cultivation) and for rearing/grazing livestock.
- (ii) Two non-agricultural uses: for building houses and roads (construction) and for mining/industrial and recreational purposes.
(c) Functions and deficiency symptoms of the nutrients [8 marks]
| Nutrient | Two functions | Two deficiency symptoms |
|---|---|---|
| Nitrogen | Promotes vegetative (leaf and stem) growth; forms part of proteins, chlorophyll and protoplasm. | Yellowing of leaves (chlorosis), starting from older leaves; stunted growth and poor yield. |
| Potassium | Strengthens stems and improves resistance to diseases; aids formation and translocation of carbohydrates and fruit/seed development. | Scorching/browning of leaf margins and tips; weak stalks with lodging and premature leaf fall. |
(d) Two ways soil structure is important in agriculture [2 marks]
- It determines soil aeration and drainage, which affect root respiration and water movement.
- It influences root penetration, water-holding capacity and the ease of tillage of the soil.
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