Students can Download Science Chapter 16 Water: A Precious Resource Questions and Answers, Notes Pdf, KSEEB Solutions for Class 7 Science helps you to revise the complete Karnataka State Board Syllabus and to clear all their doubts, score well in final exams.
Karnataka State Syllabus Class 7 Science Chapter 16 Water: A Precious Resource
Class 7 Science Water: A Precious Resource Textbook Exercise Questions and Answers
Question 1.
Mark ’T’ if the statement is true and ‘F’ if it is false.
(a) The freshwater stored in the ground is much more than that present in the rivers and lakes of the world. (T/F)
(b) Water shortage is a problem faced only by people living in rural areas. (T/F)
(c) Water from rivers is the only source for irrigation in the fields (T/F).
(d) Rain is the ultimate source of water. (T/F)
Answer:
(a) T
(b) F
(c) F
(d) F
Question 2.
Explain how groundwater is recharged.
Answer:
The rainwater and water from other sources such as rivers and ponds seeps through the soil and fills the empty spaces and cracks deep below the ground. The process of seeping of water into the ground is called infiltration. By the process of infiltration, groundwater gets recharged.
Question 3.
There are ten tubewells in a lane of fifty houses. What could be the long term impact on the water table?
Answer:
People from fifty houses use the ten tubewells. Thus, the water required by them is drawn from dying ground. The water table does not get affected as long as we draw as much water as is replenished by natural processes. If these tubewells are used for a long time and groundwater is not replenished, then the water table would go down.
Question 4.
You have been asked to maintain a garden. How will you minimize the use of water?
Answer:
We need water to maintain a garden. To minimize the use of water, we can follow the following steps:
- By following the drip irrigation technique for watering plants, this is the technique to water plants by making use of narrow tubings directly at the base of the plant.
- By harvesting rainwater, which recharges the aquifers.
- By watering the plants with recycled water.
Question 5.
Explain the factors responsible for the depletion of the water table.
Answer:
The factors responsible for the depletion of the water table are:
(a) Increase in population: The demand for water is increasing due to the increase in population. This also decreases the open area for the seepage of water into the ground.
(b) Increasing industries: Industries require water for different stages of manufacturing processes. If the number of industries increases, then the water required by them will also increase. This affects water .table.
(c) Agricultural activities: The water for agriculture is utilized from groundwater, rainwater and river water. If there is no rainfall, then farmers have to depend on groundwater for agriculture. This leads to the depletion of the water table.
Question 6.
Fill in the blanks with appropriate answers:
- People obtain groundwater through ____________ and ____________.
- Three forms of water are ____________, ____________ and ____________.
- The water bearing layer of the earth is ____________.
- The process of water seepage into the ground is called ____________.
Answer:
- tubewells, hand pumps
- solid, liquid, gaseous
- aquifer
- infiltration
Question 7.
Which one of the following is not responsible for water shortage?
(a) Rapid growth of industries.
(b) Increasing population.
(c) Heavy rainfall.
(d) Mismanagement of water resources.
Answer:
(c) Heavy rainfall.
Question 8.
Choose the correct option. The total water:
(a) in the lakes and rivers of the world remains constant.
(b) under the ground remains constant.
(c) in the seas and oceans of the world remains constant.
(d) of the world remains constant.
Answer:
(d) of the world remains constant.
Question 9.
Make a sketch showing groundwater and water table. Label it.
Answer:
