Class 7 Science Question Answers - Water: A Precious Resource

Short Types Questions

Solution: The three forms of water are solid, liquid, and gaseous.

Q.2. What is the water cycle?

The water cycle is the continuous process of water evaporating from the surface, forming clouds, and then returning to the surface as precipitation.

Q.3. What are the sources of water?

The sources of water include surface water, such as rivers and lakes, and underground water, such as wells and aquifers.

Q.4. What are the effects of water scarcity on plants?

Water scarcity can cause plants to wilt, turn yellow, and eventually die.

Q.5. What are some methods of water conservation?

Methods of water conservation include fixing leaks and dripping taps, recycling water, controlling water loss during floods, improving irrigation methods, and implementing rainwater harvesting systems.

Long Types Questions

Water is found in three forms: solid, liquid, and gas. Solid water is ice, which is formed when liquid water freezes at 0°C. Liquid water is the most common form of water, which we use for various purposes. Gaseous water is water vapor, which is formed when liquid water evaporates at 100°C. Each form of water has unique properties. For example, ice is less dense than liquid water, which is why it floats. Liquid water is a good solvent, which means it can dissolve many substances. Water vapor is lighter than air, which is why it rises in the atmosphere.

Q.2. Describe the water cycle in detail and explain its importance.

The water cycle, also known as the hydrologic cycle, is the continuous movement of water on Earth. It involves evaporation from oceans, lakes, and other bodies of water, condensation in the atmosphere, precipitation (rain, snow, sleet, hail), and runoff back to the oceans. The water cycle is important because it helps maintain the balance of water on Earth and provides fresh water for plants and animals to survive.

Q.3. Discuss the sources of water in India and the natural distribution of water in the country.

India has two main sources of water: surface water and groundwater. Surface water is found in rivers, lakes, and other bodies of water, while groundwater is found in underground aquifers. The natural distribution of water in India is uneven. The northern and eastern regions receive more rainfall than the western and southern regions. The Himalayan region is the main source of water for India's rivers, and the Ganga-Brahmaputra basin is the largest river basin in the country.

Q.4. Explain the scarcity of water and its effects on plants.

Water scarcity occurs when there is not enough water to meet the needs of people and ecosystems. It can lead to reduced crop yields, loss of biodiversity, and even famine. Plants are particularly vulnerable to water scarcity because they need water for photosynthesis and other essential functions. When there is not enough water, plants may wilt, wither, or die. Water scarcity can also lead to soil erosion, desertification, and other environmental problems.

Q.5. Discuss the various ways to conserve water and explain their importance.

There are many ways to conserve water, such as fixing leaks and dripping taps, recycling water, using water-efficient appliances, and practicing rainwater harvesting. These measures are important because they help reduce water waste and ensure that there is enough water for future generations. Fixing leaks and dripping taps can save thousands of liters of water per year, while recycling water can help reduce the demand for fresh water. Rainwater harvesting is also important because it can help recharge groundwater and reduce the risk of floods.