Class 7 Science Chapter 16 MCQ

According to the recommendation of United Nations (UN) minimum 50 liters of water per person per day should be provided. Hence, three buckets (nearly 60 liters) of water is sufficient for a person for one day.

Here, all the statements are correct. Hence your answer will be option [D].

Snow and ice are frozen while water vapor is in gaseous state. Water from lake and river are in liquid state.

The upper limit of the layer where water is present between particles of soil and gaps between rocks is called water table and water below this layer is called groundwater.

Here, all the statements are correct. Hence your answer will be option [D].

Here, all the statements are correct. Hence your answer will be option [D].

Here, all the statements are correct. Hence your answer will be option [D].

Here, all the statements are correct. Hence your answer will be option [D].

The amount of water recommended by the United Nations for drinking, washing, cooking and maintaining proper hygiene is a minimum of 50 liters per person per day.

Here, all the statements are correct. Hence your answer will be option [D].

Every drop of water is precious for life to sustain on earth.

Here, all the statements are correct. Hence your answer will be option [D].

Water cycle does not involve rainwater harvesting. Rainwater harvesting involves recharging the groundwater.

The process of seeping of water into the ground is called “infiltration”.

Snow is also solid form of water. Water is present in liquid form in ocean, river, lakes, ponds and under the ground. Water is present in gas form as water vapor in the air or atmosphere around us. Water is present in solid form on snow covered mountains, glaciers and as ice caps on the poles of the earth.

All are the effect of acute scarcity of water on plants, except shortage of carbon dioxide. Because plants give us oxygen, not carbon dioxide. Due to scarcity of water the plants will not be able to make sufficient food for themselves and for human beings also. Due to decrease photosynthesis caused by the scarcity of water the plants will not be able to release sufficient oxygen into the air, shortage of food and lesser rainfall. But shortage of CO2 is incorrect.

Plants need water to obtain nutrients from the soil, and to make food by the process of photosynthesis. The scarcity of water will affect the nutrient uptake by the plants and the process of food making photosynthesis in plants. The plants will not be able to make sufficient food for themselves and for animals. Remember, plants help in bringing rain by releasing a lot of water vapor into the atmosphere through transpiration. Scarcity of water for plants will reduce transpiration also.

Rain is the ultimate source of fresh water. In very cold regions, water drops in the sky freeze to forms snow leading to snowfall. Snow is the solid form of water. The water which falls from clouds as rain or snow is called precipitation.

If there are less number of trees and plants in the forest, less rain water will seep into the ground. Lesser number of trees and plants in the forest will bring less rainfall. Deforestation leads to less rainfall as well as laser seepage of rainwater into the ground. This depletes the water table.

Rain is the source of water on earth. And about 71% of the earth’s surface is covered with water.

All the options are the responsible for water depletion, except snowfall. Snowfall, (rainfall etc.) is the form of water. And about 71% of the earth’s surface is covered with water. Though, increasing snowfall is the source of water, not for water shortage or depletion.

Here, all the statements are correct. Hence your answer will be option [D].

In ancient times, “Bawris” were mainly set up in cities and big towns for collecting water during drought periods, not “Big boros”.

Here, all the statements are correct. Hence your answer will be option [D].

The scarcity of water will affect the nutrient uptake by the plants and the process of food making (photosynthesis) in plants. So, due to scarcity of water, the plants will not be able to make sufficient food for themselves and for animals (including human beings). This will lead to severe shortage of food leading to famine.