1. Soil is composed of all the following except (a) water (b) air (c) vitamins (d)mineral salts 2. The mineral salts needed by the plant to make new cell material is (a) Nitrogen (b) Potassium (c) Calcium (d) Iron 3. Which part of the soil is made up of solid rock? (a) Topsoil (b) Parent rock (c) Sobsoil (d) Subsoil 4. What type of soil is mostly acidic? (a) Sandy soil (b) Loamy soil (c) Clayey soil (d) Silt 5. The name given to the gradual breakdown of soil into smaller fragments is (a) soil profile (b) humus (c) weathering (d) soil texture 6. Soil aeration can be improved by (a) the activities of earthworm (b) adding minerals to the soil (c) manuring (d) weathering 7. The best soil for plant growth consist of correct proportions of (a) clay, gravel and sand (b) clay and humus (c) clay, humus and sand (d) sand, gravel and silt 8. The colour of a fertile soil is mostly (a) dark brown (b) dark green (c) yellow (d) cya 9. The root system of a plant develops from the ............. (a) cotyledon (b) endosperm (c) plumule (d) radicle 10. A fruit in which the pappus has been modified into a parachute is likely to be dispersed by (a) explosion (b) mammals (c) water (d) wind 11. Which one of the following fruits is dispersed by wind? (a) Desmodium (b) Mango (c) Crotalaria (d) Tridax 12. The part of a seed which grows to become the shoot system of a plant is the (a) cotyledon (b) plumule (c) radicle (d) testa 13. What type of fruit is mango? (a) Drupe (b) Pepo (c) Berry (d) Pome 14. Which of the following crops is not a legume? (a) Groundnut (b) Maize (c) Cowpea (d) Soyabean 15. Which of the following crops is perennial? (a) Cocoa (b) Tomato (c) Rice (d) Pineapple 16. All the following crops are cereals except (a) Millet (b) Wheat (c) Cassava (d) Maize 17. The part of the flower that produces the male sex cells is the (a) carpel (b) stamen (c) petal (d) calyx 18. Parthenocarpic fruits are fruits that (a) are succulent (b) contain seeds (c) do not contain seeds (d) are edible 19. The outer seed coat of a seed is the (a) testa (b) micropyle (c) epicarp (d) hilum 20. Which of the following fruits have no seeds? (a) Guava (b) Avocado pear (c) Pineapple (d) Tomato