NCERT Solutions Class 7 Science Chapter 17 Forests: our lifeline is one of the most interesting chapters in Class 7 Science. The Class 7 Science NCERT Solutions for Chapter 17 are provided here so that students can learn the concept of the chapter in an interactive manner.
The solutions are prepared by expert teachers in a unique manner to help students understand the concepts with ease. NCERT Solutions will help students to get familiar with the exam pattern and the syllabus of the examination.
CHAPTER 17_WATER : A PRECIOUS RESOURCE NCERT SOLUTIONS
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 )
b) Water shortage is a problem faced only by people living in rural areas. ( F )
c) Water from rivers is the only source for irrigation in the fields. ( F )
d) Rain is the ultimate source of water. ( T )
2.Explain how groundwater is recharged ?
A. i) The groundwater is recharged by a process called infiltration (the process of seeping of water in to the ground).
ii) During monsoon, rainwater and water from other sources such as rivers and ponds percolates (seeps) into the deeper layers of soil and gets added to the groundwater.
3. There are ten tube wells in a lane of fifty houses. What could be thelong termimpact on the water table ?
A. i) Water drawn from under the ground gets replenished by seepage of rainwater.
ii) The water table does not get affected as long as we draw as much water is replenished by natural processes.
iii) However, water table may go down if the water is not sufficiently replenished.
iv) As a result of this, in long term the water table beneath will be get depleted and after some years there will be no water for 10 tube wells to pump out.
4. You have been asked to maintain a garden. How will you minimise the use of water?
A. We can take following steps to minimise the use of water while maintaining thegarden :
i) We can employ drip irrigation to water the garden. (Which deliver water directly at the base of the plant so that water loss can be minimised).
ii) We should water the plants in garden in the early hours of morning or late afternoon. (In the afternoon hours due to hot sun, some amount of water may be evaporated).
iii) We should avoid using a sprinkler during windy weather (as the water will blow away and evaporate).
5. Explain the factors responsible for the depletion of water table.
A. Water table does not get affected as long as we draw as much water is replenished by natural resources.
i) Water table may go down if the water is not sufficiently replenished.
ii) Increase in population, industrial and agricultural activities are some common factors affecting water table.
iii) Scanty rainfall is another factor that may deplete the water table.
iv) Deforestation and decrease in the effective area for seepage of water are also the factors that affect the water table.
6. Fill in the blanks with the appropriate answers :
a) People obtain groundwater through _____________ and _____________.
b) Three forms of water are _____________, _____________and
c) The water bearing layer of the earth is _____________.
d) The process of water seepage into the ground is called _____________.
a) tube wells and hand pumps b) solid, liquid and gas (vapour)
c) aquifer d) infiltration
7. Which one of the following is notresponsible for water shortage? ( iii )
i) Rapid growth of industries ii) Increasing population
iii) Heavy rainfall iv) Mismanagement of water resources
8. Choose the correct option. The total water ( iv )
i) in the lakes and rivers of the world remains constant.
ii) under the ground remains constant.
iii) in the seas and oceans of the world remains constant.
iv) of the world remains constant.
9.Make a sketch showing groundwater and water table. Label it.
A.
NCERT Solutions Class 7 Science Forests: Our Lifeline Introduction
Class 7 solutions for Science Forests: Our Lifeline, specifically deals with the issues of forests and the importance of forests to our life. Forests have always been a source of many natural resources over the decades. Man’s ancestors considered forests to be their home for millions of years. It is only with the advent of civilisation that we started to move away from forests and started producing our source of food and resources. Today, the forests are home to many species of plants and animals. They form the ecosystem, and each species has a specific role to play.
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Frequently Asked Questions on NCERT Solutions for Class 7 Science Chapter 17
How many questions are present in the Chapter 17 of NCERT Solutions for Class 7 Science?
There are about 13 questions present in the Chapter 17 of NCERT Solutions for Class 7 Science. It includes short answer questions and multiple choice questions explained in a simple language. Students who are not able to answer the questions from the textbook can refer to the solutions to get a clear overview of the chapter. By practising these questions on a daily basis, students will be able to score well in the annual exam. It improves confidence among students to answer complex questions without any difficulty.
What are decomposers explained in the Chapter 17 of NCERT Solutions for Class 7 Science?
The micro organisms which convert the dead animals and plants to humus are called decomposers. For example, bacteria and fungi help in recycling the nutrients by decomposing dead animals and plants. Students can refer to the NCERT Solutions from INFINITY LEARN to get a clear idea about this concept. The subject matter experts make use of a simple and understandable language to help students score well in the annual exam. Using these solutions, students will get an overall idea about the chapter and the questions which are important for the exam.
What does the Chapter 17 of NCERT Solutions for Class 7 Science convey?
From the Chapter 17 of NCERT Solutions for Class 7 Science, students will learn about the issues of forests and the importance of forests in our lives. Many natural resources have been available in the forests over the decades. In the current generation, forest has become a home to various species of animals and plants. They form the ecosystem in which each species has a unique role to play. For a better knowledge about this chapter, students are advised to solve the textbook questions using the NCERT Solutions from INFINITY LEARN.
