Title 4. Soil.pdf ✅

VII - OLYMPIAD NEET BIOLOGY STUDY MATERIAL The different components of soil are: a. Rock or soil particles of different sizes. b. Humus (organic matter). c. Soil water containing various inorganic salts. d. Soil air. e. Soil organisms. SOIL PARTICLES: a. A soil has a mixture of different sized particles. b. Gravel or stone has the largest particle size. c. Smallest particle size is clay. S.No Types of particles Diameter 1 Gravel or stones Above 2.0 mm 2 Sand 0.2 to 2.0 mm 3 Slit 0.02 to 0.2 mm 4 Clay Below 0.02 mm 5 Humus Floating mater TEXTURE OF THE SOIL: 1. Sandy soils are highly porous. These soils does not hold water. Sandy soil is not suitable for plant growth. 2. Clayey soils have no or very little air in between the particles, but hold enough water, these soils contain humus. Clay soil is able to support plant growth. 3. Loamy soils are best for plant growth. i. It contains humus, providing fertility to the soil. ii. It holds sufficient water due to the presence of smaller particles. iii. It contains enough air due to the presence of some large particles. 4. These features permit proper root penetration, growth and absorption of water and minerals from the soil. WORK SHEET-1 1. What does soil contains? 1) Water and air 2) Water and plants 3) Rocks, minerals, organic matter, air and water 4) Water, air, plants
NEET BIOLOGY STUDY MATERIAL VII - OLYMPIAD 2. What makes clay suitable for making pots? 1) It is fertile without humus 2) It can be moulded and clay particles are sticky 3) It is fertile 4) None of these 3. A mixture of weathered rock organic matter is called 1) Rocks 2) Humans 3) Bed rock 4) Soil 4. What is the picture indicates? 1) Paleontology 2) Pottery 3) Weathering 4) Soil profile 5. Which of these live in soil and make soil fertile? 1) Ring worm 2) Flat worm 3) Earthworm 4) Silk worm 6. How can we prevent soil erosion? 1) Flow of water 2) Deforestation 3) Flow of wind 4) Afforestation 7. What are the biological agents helps in soil formation? 1) Wind 2) Water 3) Climate 4) Round worms 8. Who is the man in the picture shown below? What is he studying about? 1) Pedologist studying about soil and rocks 2) Geologist studiying about earth surface and fossils 3) Criminologist detecting of crimes 4) Ichnologist studying fossil foot prints