Nature's Treasure Worksheet Solutions VI CBSE PDF

Worksheet Solutions – Nature’s Treasure VI CBSE Section A I. Objective Questions: 1. Most of the water is found in __________ and ____________. Answer: Most of the water is found in oceans and seas. 2. Saline water is unsuitable for domestic, ____...

Worksheet Solutions – Nature’s Treasure VI CBSE Section A I. Objective Questions: 1. Most of the water is found in __________ and ____________. Answer: Most of the water is found in oceans and seas. 2. Saline water is unsuitable for domestic, _______________, and industrial use. Answer: Saline water is unsuitable for domestic, agricultural, and industrial use. 3. Step-wells commonly known as ____________ in Rajasthan and ___________________ in Gujarat are built for water harvesting. Answer: Step-wells commonly known as Bawadi in Rajasthan and Vav in Gujarat are built for water harvesting. 4. _______________ capture the sun's energy and produce electricity. Answer: Solar panels capture the sun's energy and produce electricity. 5. ______________is a weeklong event celebrated across the country during the month of July. Answer: Van Mahotsav is a weeklong event celebrated across the country during the month of July. 6. _____________ are natural agents that help in turning and loosening the soil. Answer: Earthworms are natural agents that help in turning and loosening the soil. 7. Soil is formed by the disintegration (breaking apart) of rocks by actions of the _________, ____________ and ______________________. Answer: Soil is formed by the disintegration (breaking apart) of rocks by actions of the Sun, water, and living organisms 8. Soil is a precious treasure that supports _________________. 1|Page w w w.gurudatta reyatuitions.com  Worksheet Solutions – Nature’s Treasure VI CBSE Answer: Soil is a precious treasure that supports biodiversity. 9. _______________ can be used as a building material. Answer: Laterite can be used as a building material. 10. Petrol, diesel, and kerosene are obtained from _________________. Answer: Petrol, diesel, and kerosene are obtained from petroleum. 11. _____________ is a cleaner fuel than petrol or diesel. Answer: CNG is a cleaner fuel than petrol or diesel. 12. Resources that we get from nature are called _______________. Answer: Resources that we get from nature are called natural resources. 13.Resources that get renewed, replenished, or restored within a reasonable period of time are called ___________________.. Answer: Resources that get renewed, replenished, or restored within a reasonable period of time are called renewable resources. II. Multiple Choice Question: 1. Which of the following increases the carbon dioxide level in the atmosphere? a) Afforestation b) Deforestation c) Social forestry d) None of the above Answer: b Explanation: Deforestation refers to the mass-scale falling of trees. Plants inhale carbon dioxide and exhale oxygen. Mass-scale deforestation may contribute to a 10% increase in the carbon dioxide level in the atmosphere. 2. Who is the father of the Chipko movement? a) Nathuram Bahuguna b) Sunderlal Bahuguna c) Sitaram Bahuguna d) None of the above 2|Page w w w.gurudatta reyatuitions.com  Worksheet Solutions – Nature’s Treasure VI CBSE Answer: b Explanation: Sunderlal Bahuguna is the father of the Chipko movement. It was started in 1974 by some village women to reduce trees falling (deforestation). The villagers came forward and hugged the trees to prevent the contractor from felling them. 3. Wells are fed by (a) Pond water. (b) Lake water. (c) Rainwater. (d) Groundwater. Answer: The correct answer is option (d) Groundwater. Explanation: Some of this water is absorbed by the ground and soil, increasing the level of groundwater. This groundwater becomes the well's source of water. Section B III. Short Answer Questions: Q1. What is the primary use of natural gas? Answer: Cooking and generating electricity Q2. Describe the traditional water harvesting system used in Rajasthan and Gujarat. Answer: In Rajasthan and Gujarat, traditional water harvesting systems include stepwells (known as Bawadi in Rajasthan and Vav in Gujarat). These step-wells are deep, vertical wells with steps leading down to the water. They collect rainwater as well as water that seeps from nearby lakes, ponds, and rivers. Q3. What is the main use of coal? Answer: The production of electricity Q4. What will happen if the amount of oxygen is increased in the air? Answer: Air will become more combustible and many substances may undergo fast oxidation. 3|Page w w w.gurudatta reyatuitions.com  Worksheet Solutions – Nature’s Treasure VI CBSE Q5. Name the substances that are present in traces in air. What are these together called? Answer: Xenon (Xe), Krypton (Kr), Neon (Ne) and Helium (He) are present in traces in the air. These together form 0.02% of air and are called inert gases. Q6. What are the properties of air? Answer: 1. Air occupies space. 2. Air is present everywhere around us. 3. Air has no colour and one can see through it. 4. It is transparent Q7. The mountaineers carry oxygen cylinders with them while climbing high mountains. Why? Answer: The availability of air decreases gradually as we go up in the atmosphere. Q8. What are forests? Answer: Forests are large areas with dense growth of various types of plants (herbs, shrubs, and trees). Forests are a natural home for many wild animals, including birds and insects. Forests provide food and shelter to them. Q9. What is the full form of LPG and CNG? Answer: LPG -Liquefied petroleum gas. CNG – Compressed natural gas. Q10. What type of energy is being used for cooking? Answer: The energy being used for cooking in the image is solar energy, which is harnessed from sunlight. 4|Page w w w.gurudatta reyatuitions.com  Worksheet Solutions – Nature’s Treasure VI CBSE Q11. Fill in the blanks in the given passage. The rainwater and __________ from other sources such as rivers and ponds seep through the __________ and fill the empty spaces and cracks deep below the ground. The process of seeping water into the ground is called __________. Answer: The rainwater and water from other sources such as rivers and ponds seep through the soil and fill the empty spaces and cracks deep below the ground. The process of seeping water into the ground is called infiltration. 12. Place the following statements in a proper order to form a meaningful paragraph. (a) Which in turn decreases the seepage of rain water into the ground. (b) This decreases the open areas like park and playgrounds. (c) Increasing population creates demand for the construction of houses, shops, offices, roads, and pavements. (d) This results in the depletion of the water table and creates scarcity of more water. Answer: The correct sequence is- (c) Increasing population creates demand for the construction of houses, shops, offices, roads, and pavements. (b) This decreases the open areas like park and playgrounds. (a) Which in turn decreases the seepage of rain water into the ground. (d) This results in the depletion of the water table and creates scarcity of more water. IV. Long answer question: Q1. Soil formation, also known as pedogenesis, begins with the gradual breakdown of rocks through weathering. This process is a result of physical, chemical, and biological factors such as water, wind, sun, and living organisms. a. Explain the effect of heat and cold on rocks 5|Page w w w.gurudatta reyatuitions.com  Worksheet Solutions – Nature’s Treasure VI CBSE Answer: The rock expands with heat and contracts with cold, causing cracks to form and eventually break apart the rock over time; b. Explain the effect of wind and water on rocks. Answer: Wind and water can significantly affect rocks by causing them to break down into smaller pieces through a process called weathering. Thus further widening the rocks in the form of cracks. c. What is the role of microbes in the weathering of rocks? Answer: Microbes play a crucial role in soil formation by actively breaking down rocks where they secrete acids and enzymes that dissolve minerals facilitating the creation of soil particles from the weathered rock material. Thus, widening the rocks. d. How does the degradation of dead plants and animals benefit soil formation? Answer: Microorganisms act on the dead plant and animal remains, degrade, and decompose them into simpler organic compounds. The decaying matter gets mixed with rock particles to form soil. e. What is humus and its benefit? Answer: Humus is partially decayed organic matter. Function of humus: It makes soil porous, thereby increasing its air and water holding capacity. It is rich in nutrients (e.g., minerals) that promote plant growth. f. How long does it take to form 1 inch of soil? Answers: It can take 500 to 1,000 years for one inch of topsoil. g. Write the contents of the soil. Answer: Soil is a material composed of five ingredients — minerals, soil organic matter, living organisms, gas, and water. Soil minerals are divided into three size classes — clay, silt, and sand. 6|Page w w w.gurudatta reyatuitions.com  Worksheet Solutions – Nature’s Treasure VI CBSE Q2. “Forests are our lifeline.” Write five sentences on this topic. Answer: Forests are our lifeline for the following reasons- i. Trees are responsible for the health of the rest of the natural environment. ii. They give us oxygen for respiration. iii. Trees absorb sound and hence reduce noise pollution. iv. Forests help to reduce floods in neighbouring areas by increasing the soil's water-holding capacity. v. Trees provide us with food (fruits and vegetables), while medicinal plants provide some treatment. vi. Forests provide a safe haven for wildlife. Q3. Explain the difference between deforestation, reforestation, and afforestation. Answer: The main difference between deforestation, reforestation, and afforestation is that deforestation is the removal of trees, while reforestation and afforestation are both the planting of trees: Deforestation: The intentional or accidental removal of trees and other vegetation from a forest, usually for agriculture, housing, or firewood. Deforestation can lead to soil erosion. Reforestation: The practice of planting trees to restore a forest that has been damaged or destroyed, usually through deforestation. 7|Page w w w.gurudatta reyatuitions.com  Worksheet Solutions – Nature’s Treasure VI CBSE Afforestation: The practice of planting trees in an area that was previously barren or open grassland, creating a new forest. Afforestation can help to maintain a healthy ecosystem, reduce soil erosion, and reduce air pollution. Q4. Deforestation, or the clearing of trees from forests, has many negative effects on the planet. Write the consequences of deforestation. Answer: The consequences of deforestation are as follows; Increase in temperature and global warming. Increased soil erosion by wind and rain, increased flooding. Extinction of wildlife (forest animals and plants). Disruption of the water cycle. Deforestation causes drought and desertification. Q5. Explain the effect of over-cropping and cover-cropping on soil erosion. Answer: Overcropping in agriculture refers to the practice of continuously growing the same crop in the same field for an extended period without allowing the soil to rest and replenish its nutrients. Overcropping can exacerbate soil erosion as the lack of plant cover leaves the soil exposed to wind and water. Cover cropping is the practice of growing plants to cover the soil instead of harvesting them. Cover crops can be planted in addition to a primary cash crop, or in place of a cash crop when it's not being grown. They lead to better water infiltration and water holding capacity in the soil and make the soil less susceptible to erosion from wind and water. 8|Page w w w.gurudatta reyatuitions.com  Worksheet Solutions – Nature’s Treasure VI CBSE Q6. Soil is mainly classified by its texture, proportions, and different forms of organic and mineral compositions. Soil is classified into four types: Sandy soil. Silt Soil. Clay Soil and Loamy soil. Based on the characteristics of the soil answer the questions below: Answer: Smaller than sand and larger than clay – Clay soil. Very low nutrients and poor water holding capacity – Sandy soil. Smallest particle – Clay soil Easily transported by moving currents and it is mainly found near rivers, lakes, and other water bodies – Silt soil Makes it hard for the plant’s roots to absorb water – Sandy soil The densest and heaviest type of soil – Clay soil The best type of soil for most plants – Loamy soil Low in nutrients and doesn't hold water well. – Sandy soil Arrange the soil in descending order based on particle size – Sand > Silt > Clay Q7. Complete the following chart by writing appropriate words in the boxes marked (a) to (e). Answer: The missing words are a) Solid b) Gas c) Lake water d) Underground water e) Ice 9|Page w w w.gurudatta reyatuitions.com  Worksheet Solutions – Nature’s Treasure VI CBSE V. Picture Study: Q1. (a) Identify the diagram (b) Define (a) (c) Write three benefits of a farming technique. Answer: 1(a). Terrace farming 1(b). Terrace Farming, or terrace agriculture, is a technique in which steps are carved into mountainous regions to create farmable land. terracing, or creating these steps, not only allows for the creation of fields but also enables farmers to control the movement of the water to their crops. 1© Three benefits of terrace farming are: Soil and water conservation: Terraces reduce the amount and speed of water flowing across the soil, which helps prevent soil erosion. This allows for more intensive cropping. Increased food production: Terrace farming makes it possible to farm hilly areas that would otherwise be unusable. Improved soil quality: Terrace farming helps retain soil cover and fertility. Q2. (a) Identify the image (b) Define (a) (c) Write the important benefits of this soil conservation method. 10 | P a g e w w w. g u r u d a tt a re yat u i t i o n s. c o m  Worksheet Solutions – Nature’s Treasure VI CBSE Answer: 2(a): Shelter belts 2(b): A shelterbelt is defined as a barrier of trees and shrubs that provides protection from wind and storm and decreases erosion. 2©: Shelterbelts can reduce wind speed, which can help protect crops, livestock, and people from the elements. They can also help reduce the impact of wind erosion, which can be caused by even moderate wind speeds 11 | P a g e w w w. g u r u d a tt a re yat u i t i o n s. c o m