2. Q 3. Ans. E. Short Answer Type Questions 1. How is percolation rate calculated? What is humus? Answer: Question 2. Answers: 1. Humus helps plants to grow well. • Write short answers: Q 1. Ans. Answers: 1. Sounds like a topic for another post – but the short answer is that their may be some value to them – but the scientific evidence supporting a real value in the garden is weak at best. What is soil made up of? 3. Question 1. When is soil said to be polluted? Humus (or humous) is the organic matter in the soil. Humus, which ranges in colour from brown to black, consists of about 60 percent carbon, 6 percent nitrogen, and smaller amounts of phosphorus and sulfur. It usually gives the soil a blackish colour. What is soil erosion? Draw the different horizons of soil. Humus is gold to a gardener and considered important to soil building. 4. Short Answer Type Questions. I. Humus, nonliving, finely divided organic matter in soil, derived from microbial decomposition of plant and animal substances. Soil is mainly made up of gravel , sand , clay , humus, water and air. Q 2. Which soil will allow more water— sandy soil or clayey soil? Humus is the major factor in deciding the soil structure because: (i) it causes the soil to become more porous. Function. False. This is significant because this attribute enables humus to hold up to 90% of its weight in water, meaning soil laden in humus will be able to retain moisture better and be more drought resistant. Humus does not include: a. decomposing organic matter b. leaf litter c. weathered rock d. feces e. dead organisms. What is weathering? It is a dead organic matter … Soil Class 7 Extra Questions Short Answer Type 2. 1. Furthermore, what is humus short answer? Write briefly about the topsoil. True 4. What is weathering ? 4. A new study breaks all of you ideas about humus and shows that it does not exist. List the factors which cause weathering. The humus sponge also latches onto and safeguards nutrients that plants require, such as calcium , magnesium and … True 3. As humus Answer: Weathering involves disintegration or decay of solid rock due to change in temperature and weather and their impact on the composition of rock. Name the different types of soil. Humus has a characteristic black or dark brown color and is an accumulation of organic carbon.Besides the three major soil horizons of (A) surface/topsoil, (B) subsoil, and (C) substratum, some soils have an … The humus makes the soil fertile and provides nutrients to growing plants. What do you understand by percolation? Answer:Humus is dark, organic material that forms in soil when plant and animal matter decays. View Answer What … Humus is the dark organic matter that forms in soil when dead plant and animal matter decays. What is soil profile? A soil sample takes 45 minutes to percolate 900 mL of water. What is Humus? Why is it important for the soil? It is made of dead parts of plants and … 2. (ii) allows water and air to penetrate deep into the soil making available for the roots of the plants. Answer: The uppermost horizon is generally dark in colour as it is rich in humus and minerals. 3. 6. False 2. Humus has many nutrients that improve the health of soil, nitrogen being the most important. When plants drop leaves, twigs, and other material to the ground,… Find the percolation rate of it. Humus is the bits of decayed organisms present in the soil. Draw a well labelled a diagram showing different constituents of soil. ... Answer: Humus : Humus is a dark substance formed in soils. Short Answer Questions. 3. Why? The rotted remains of dead plants and animals is called humus. Question 1. Name different horizons of … True 5. What is humus?