CBSE Class 7 Science Exemplar Chapter 17: Forests - Our Lifeline NCERT Solutions

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NCERT Solutions PDF Class 7 PDF

This chapter, "Forests: Our Lifeline," delves into the crucial role forests play in our ecosystem. The NCERT Solutions for Class 7 Science Exemplar cover essential concepts related to forest environments, including the functions of plants as 'green lungs,' the importance of maintaining silence in forests to protect wildlife, and the identification of various forest inhabitants. Students will learn to differentiate between trees, bushes, climbers, and creepers, and understand which products are derived from forest wood. These solutions provide clear explanations and answers to multiple-choice questions, aiding students in grasping the significance of forests and their conservation. They are designed to reinforce learning and prepare students for exams by offering detailed insights into the chapter's topics.

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Quick info

BoardCBSE
ClassClass 7
SubjectScience Exemplar
Session2026
LanguageEnglish
TypeNCERT Solutions
ChapterChapter 17

Chapter summary

Chapter 17, "Forests: Our Lifeline," focuses on understanding the vital role of forests. The NCERT Solutions cover key aspects such as the ecological significance of forests as 'green lungs,' the impact of noise on forest animals, the characteristics of different forest plants and animals, and the products derived from wood. The solutions clarify concepts through multiple-choice questions, helping students identify forest components and understand their interdependence.

Learning outcomes

  • Understand the role of forests as 'green lungs' for the planet.
  • Recognize the importance of maintaining a peaceful environment for forest animals.
  • Identify different types of forest plants like trees, bushes, climbers, and creepers.
  • Distinguish between forest animals and plants.
  • Identify products that are made from wood obtained from forests.

Topics covered

Paper topics

  • Forests as Green Lungs
  • Importance of Silence in Forests
  • Forest Animals
  • Types of Plants (Trees, Bushes, Climbers, Creepers)
  • Products from Forest Wood
  • Identification of Trees and Animals

Important topics

  • Forests as 'Green Lungs'
  • Impact of Noise on Wildlife
  • Products Derived from Forest Wood
  • Distinguishing Trees from Animals

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Questions and Solutions

Multiple Choice Questions

1. Which of the following serve as green lungs?
  1. Green pigment of the plants
  2. Forests
  3. Kitchen gardens
  4. Green house gases
Solution: The correct option is (b) Forests. Forests are vital for maintaining the Earth's atmosphere. Plants within forests absorb carbon dioxide and release oxygen through photosynthesis, a process that helps regulate air quality and is essential for the survival of most living organisms. This function is why forests are often referred to as the 'green lungs' of our planet.

Multiple Choice Questions

2. Boojho visited a forest near his town with his classmates and his teacher. As they were entering the forest, their class teacher told them not to make noise in the forest as noise could disturb the
  1. birds
  2. animals
  3. both birds and animals
  4. plants
Solution: The correct option is (c) both birds and animals. Forests are natural habitats for a wide variety of birds and animals. Loud noises can frighten them, disrupt their feeding and nesting patterns, and cause them stress. Therefore, it is important to maintain silence in forest areas to protect the wildlife.

Multiple Choice Questions

3. Which among the following forest animals is the smallest?
  1. Fox
  2. Boar
  3. Bison
  4. Porcupine
Solution: The correct option is (d) Porcupine. Comparing the typical sizes of these animals, the porcupine is generally the smallest among a fox, boar, and bison.

Multiple Choice Questions

4. Which of the following has the strongest stem?
  1. A tree
  2. A creeper
  3. A climber
  4. A bush
Solution: The correct option is (a) A tree. Trees are characterized by their thick, woody, and strong stems that are capable of supporting a large canopy of leaves and branches, making them the strongest among the given plant types.

Multiple Choice Questions

5. Which of the following is not prepared from the wood obtained from forest?
  1. Paper
  2. Thermocol
  3. Matchsticks
  4. Plywood
Solution: The correct option is (b) Thermocol. Paper, matchsticks, and plywood are all common products that are manufactured using wood sourced from forests. Thermocol, on the other hand, is a synthetic material, typically made from polystyrene, and is not derived from wood.

Multiple Choice Questions

6. Which of the following is not the name of a tree?
  1. Teak
  2. Sal
  3. Porcupine
  4. Kachnar
Solution: The correct option is (c) Porcupine. Teak, Sal, and Kachnar are all well-known types of trees. A porcupine is an animal, specifically a rodent, and is not a type of tree.

Common mistakes

  • Confusing animals with plant names.
  • Not understanding the ecological role of plants as 'green lungs'.
  • Underestimating the impact of noise on wildlife.

Revision tips

  • Review the definitions of different plant types (tree, bush, climber, creeper).
  • Focus on understanding why forests are called 'green lungs'.
  • Memorize the products derived from forest wood.
  • Pay attention to the reasons behind maintaining silence in forests.

Practice MCQs

Q1. Which of the following is considered the 'green lungs' of the Earth?

Q2. Why should one avoid making noise when visiting a forest?

Q3. Which of the following forest animals is the smallest in size?

Q4. Which type of plant typically possesses the strongest stem among the following?

Q5. Which of the following items is NOT prepared from wood obtained from forests?

Q6. Identify the option that is NOT a name of a tree.

Frequently asked questions

What is the main concept covered in CBSE Class 7 Science Exemplar Chapter 17?

Chapter 17, "Forests: Our Lifeline," focuses on the ecological importance of forests, the role of plants in maintaining air quality, the impact of human activities on forest life, and the various products obtained from forests.

Why are forests called 'green lungs'?

Forests are called 'green lungs' because the plants within them perform photosynthesis, absorbing carbon dioxide and releasing oxygen, which is vital for the respiration of most living organisms.

What is the significance of maintaining silence in a forest?

Maintaining silence in a forest is important to avoid disturbing the birds and animals that live there, allowing them to carry out their natural activities without stress or fear.

Can you list some products made from forest wood?

Yes, common products made from forest wood include paper, matchsticks, and plywood. Thermocol is an example of something not made from wood.

How do these NCERT Solutions help students?

These solutions provide clear, step-by-step explanations for each question, helping students understand the concepts related to forests, their inhabitants, and their importance, thereby aiding in exam preparation.

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