Class 2 Science Chapter 5 Question Answers - Water

Short Answer Questions

Q1: What percentage of the Earth's surface is covered with water?
Ans: Three-fourths (75%).

Q2: Why is ocean water not suitable for drinking or irrigation?
Ans: Ocean water is salty.

Q3: What is the main source of freshwater on Earth?
Ans: Groundwater.

Q4: Define potable water.
Ans: Potable water is safe for human consumption, such as drinking and cooking.

Q5: What is the primary purpose of hydroelectric power plants?
Ans: Hydroelectric power plants generate electricity using the force of flowing water from large dams.

Long Answer Questions

Q1: Explain the water cycle in detail.
Ans: The water cycle is a continuous process involving evaporation, condensation, cloud formation, and precipitation. Water evaporates from oceans, rivers, and lakes, condenses in the atmosphere to form clouds, and falls back to the Earth as rain or snow.

Q2: How does rainwater harvesting contribute to water conservation?
Ans: Rainwater harvesting involves collecting and storing rainwater for future use. It increases the availability of potable water, raises the water table, prevents soil erosion, and serves as a good source of water for plant growth.

Q3: Describe the states of water in nature and provide examples.
Ans: Water exists in three states: solid (ice, snow), liquid (rivers, lakes), and gaseous (water vapour in the air). For example, snow on mountains is in the solid state, rivers represent the liquid state, and water vapour is present in the air.

Q5: Why is groundwater considered a valuable source of freshwater?
Ans: Groundwater is valuable as it supplies clean drinking water, fills wells and lakes, and is a result of rainwater seeping into the ground, ensuring a continuous source of freshwater.

Q5: Discuss the consequences of continuous heavy rainfall in a region.
Ans: Continuous heavy rainfall can lead to floods, causing damage to crops, infrastructure, and increased risk of waterborne diseases. It may also erode fertile topsoil and impact farming for an extended period.