Question

D. Short Answer Questions (in one to two sentences)
1. Which water sources are available to us as freshwater?
2. How do the plants contribute to water cycle?
3. Write one reason for the occurrence of floods.
4. Define the term 'rainwater harvesting'.
5. How can the plants not survive in flood conditions?
6. Why do the water drops fall as snow and hail in colder regions?​

Answer 1

1. Which water sources are available to us as freshwater?

Ans.- Surface water like lake and rivers and groundwater are some main sources of freshwater which is available to us.

2. How do the plants contribute to water cycle?

Ans.- Plants contribute to water cycle by water movements from Earth's surface to the atmosphere and then back. This process is called transportation water cycle.

3. Write one reason for the occurrence of floods.

Ans.- Floods are natural disasters which can be occur by ecessive rain, broken dams, rapid melting of glaciers can spread the river adjacent to the floodplain.

Following are the major reasons of flood:-

• Additional debris deposited in the river bed
• Changes in river current due to excessive rain etc.
• Man-made/artificial cause of flood is broken dams.

4. Define the term 'rainwater harvesting'.

Ans.- Rainwater harvesting is a process in which we can use rainwater for the domestic things which needs water. We can collect rainwater by storing rainwater at a designated location like rooftop. This process involves not only stopping rainwater but also making it clean.

5. How can the plants not survive in flood conditions?

Ans.- Plants can't survive in flood conditions because in most of the cases they got damaged. Oxygen level get decrease due to excessive water transportation into soil and plants roots. After that, soil pores are completely filled with water and hence no quantity of oxygen left.

6. Why do the water drops fall as snow and hail in colder regions?

Ans.- When the temperature is zero or less than zero, the moisture in the sky condenses and freezes like small drops of water. gradually more water accumulates on these mounds. And then snowflakes and hails are formed in closer regions after that these pieces gain weight and they begin to fall to the ground. Due to requirements of very low temperature, snow and hail form up only in colder regions rather than dry and hotter regions.

Answer 2

Answer:

Answers⤵

D)1.Fresh water may include water in ice sheets, ice caps, glaciers, icebergs, bogs, ponds, lakes, rivers, streams, and even underground water called groundwater.

2)Plants absorb water from the soil. The water moves from the roots through the stems to the leaves. Once water reaches the leaves, some of it evaporates from the leaves, adding to the amount of water vapor in the air. This process of evaporation through plant leaves is called transpiration.

3)Severe flooding is caused by atmospheric conditions that lead to heavy rain or the rapid melting of snow and ice. Geography can also make an area more likely to flood. For example, areas near rivers and cities are often at risk for flash floods. A flood is an overflow of water onto land that is normally dry.

4)Rainwater harvesting is the collection and storage of rain, rather than allowing it to run off. Rainwater is collected from a roof-like surface and redirected to a tank, cistern, deep pit, aquifer, or a reservoir with percolation. Dew and fog can also be collected with nets or other tools

5)There are many ways that flooding can damage plants. Excessive moisture in soil decreases oxygen levels. This impedes respiration (where energy is released from sugars) in the roots leading to the build-up of carbon dioxide, methane and nitrogen gases. Ultimately, the roots can suffocate and die.

6)When the drops are heavy enough, they fall to the Earth. If a cloud is colder, like it would be at higher altitudes, the water droplets may freeze to form ice. These ice crystals then fall to the Earth as snow, hail, or rain, depending on the temperature within the cloud and at the Earth's surface.