Lakhmir Singh Solutions is one of the well-known reference materials preferred by students of all classes. These solutions are based on the syllabus designed by the Central Board of Secondary Education (CBSE). The concepts covered in these solutions are explained in an easy-to-understand manner by Lakhmir Singh and Manjit Kaur.
Lakhmir Singh Solutions for Class 8 Science are provided in this article. The following table provides the list of chapters that are covered in Lakhmir Singh Solutions for Class 8 Science:
After studying all the chapters, students can practise these solutions, which test their knowledge about the concepts and topics covered in each chapter. Different types of questions are included in the solutions, and they are as follows:
- Very short answer type questions
- Short answer type questions
- Long answer type questions
- Multiple-choice questions
- Higher-order thinking skills questions
Chapter 1: Crop Production and Management
Crop Production and Management is a chapter which introduces students to why crops are important and how to grow and take care of them. The crop is defined as plants that belong to the same kind and is grown on a large scale. The chapter focuses on different practices that are related to crop growth.
Following is the table explaining the number of questions that are present in Chapter 1:
| Very short answer type questions | 30 |
| Short answer type questions | 35 |
| Long answer type questions | 5 |
| Multiple-choice questions | 20 |
| Higher-order thinking skills questions | 5 |
| Total questions | 95 |
Chapter 2: Micro-Organisms: Friend and Foe
How can a microorganism be a friend as well as a foe? This question is answered in Chapter 2. Other concepts, such as the classification of microorganisms, food preservation, and different cycles like the nitrogen cycle, are covered in this chapter.
Following is the table explaining the number of questions that are present in Chapter 2:
| Very short answer type questions | 40 |
| Short answer type questions | 25 |
| Long answer type questions | 5 |
| Multiple-choice questions | 20 |
| Higher-order thinking skills questions | 5 |
| Total questions | 95 |
Chapter 3: Synthetic Fibres and Plastics
The topics covered in this chapter are as follows:
We all agree that plastics have made our life easy, but we are also aware of the side effects that plastics have when it comes to the environment.
Also, it explains that the clothes that we wear are classified into two categories, and they are:
- Natural fibres
- Synthetic fibres
Other terms, such as polymers and their types and uses, are also explained in Chapter 3.
Following is the table explaining the number of questions that are present in Chapter 3:
| Very short answer type questions | 15 |
| Short answer type questions | 35 |
| Long answer type questions | 5 |
| Multiple-choice questions | 20 |
| Higher-order thinking skills questions | 5 |
| Total questions | 80 |
Chapter 4: Materials: Metals and Non-metals
Ever wondered what makes iron pillars stand strong and rust-free for all these years and maybe even in the coming days? This question is answered in Chapter 4. What are metals and non-metals? How are they different from each other? What are their characteristics and uses? etc., are answered in this chapter.
Following is the table explaining the number of questions that are present in Chapter 4:
| Very short answer type questions | 35 |
| Short answer type questions | 30 |
| Long answer type questions | 5 |
| Multiple-choice questions | 20 |
| Higher-order thinking skills questions | 5 |
| Total questions | 95 |
Chapter 5: Coal and Petroleum
Coal and petroleum are two examples of exhaustible natural resources. But from where did humans find these resources? Fossil fuels are the sources of these resources. What happens when all the exhaustible natural resources are consumed? How can we reduce the usage of these resources? What are the alternative resources that can replace fossil fuels? These are the questions that are answered along with practice questions in this chapter.
Following is the table explaining the number of questions that are present in Chapter 5:
| Very short answer type questions | 23 |
| Short answer type questions | 18 |
| Long answer type questions | 4 |
| Multiple-choice questions | 12 |
| Higher-order thinking skills questions | 3 |
| Total questions | 60 |
Chapter 6: Combustion and Flame
Combustion is defined as the process in which a substance reacts with the oxygen that is present in the atmosphere resulting in heat and light production. What is the chemical reaction that takes place during combustion, the types of flames that are produced during the combustion etc., are explained in this chapter.
Following is the table explaining the number of questions that are present in Chapter 6:
| Very short answer type questions | 20 |
| Short answer type questions | 30 |
| Long answer type questions | 5 |
| Multiple-choice questions | 20 |
| Higher-order thinking skills questions | 5 |
| Total questions | 80 |
Chapter 7: Conservation of Plants and Animals
Conservation of plants and animals is defined as the process of protecting plants and animals from damage. This is one of the prime responsibilities of humans, as plants and animals play a vital role in the balance of ecosystems. Understand how to protect the environment in Chapter 7.
Following is the table explaining the number of questions that are present in Chapter 7:
| Very short answer type questions | 18 |
| Short answer type questions | 42 |
| Long answer type questions | 5 |
| Multiple-choice questions | 20 |
| Higher-order thinking skills questions | 5 |
| Total questions | 90 |
Chapter 8: Cell Structure and Functions
We know that a cell is a basic structure in any organism. How does the structure of cells vary in animals and plants? What are the functions of cells, basic parts of cells etc., are explained with the help of relevant examples and diagrams in Chapter 8.
Following is the table explaining the number of questions that are present in Chapter 8:
| Very short answer type questions | 45 |
| Short answer type questions | 20 |
| Long answer type questions | 5 |
| Multiple-choice questions | 20 |
| Higher-order thinking skills questions | 5 |
| Total questions | 95 |
Chapter 9: Reproduction in Animals
The production of a new organism from the existing and from the same species is known as reproduction. Why is reproduction important? How does the offspring is obtained from either a single cell or from multiple cells? What are the different methods of reproduction in animals? Find the answers to these questions in Chapter 9.
Following is the table explaining the number of questions that are present in Chapter 9:
| Very short answer type questions | 35 |
| Short answer type questions | 25 |
| Long answer type questions | 5 |
| Multiple-choice questions | 20 |
| Higher-order thinking skills questions | 5 |
| Total questions | 90 |
Chapter 10: Reaching the Age of Adolescence
What is the reason behind a baby growing up into a fully grown man or woman? The answer is hormones. Hormones play different roles in human development and are even responsible for the determination of the sex of the baby. Learn more about hormones in Chapter 10.
Following is the table explaining the number of questions that are present in Chapter 10:
| Very short answer type questions | 50 |
| Short answer type questions | 40 |
| Long answer type questions | 5 |
| Multiple-choice questions | 20 |
| Higher-order thinking skills questions | 5 |
| Total questions | 120 |
Chapter 11: Force and Pressure
Did you know that the air we are surrounded by is continuously exerting pressure on us? Chapter 11 explains how pressure is exerted by solids, liquids, and gases, and what is force and its types.
Following is the table explaining the number of questions that are present in Chapter 11:
| Very short answer type questions | 30 |
| Short answer type questions | 30 |
| Long answer type questions | 5 |
| Multiple-choice questions | 20 |
| Higher-order thinking skills questions | 5 |
| Total questions | 90 |
Chapter 12: Friction
The reason why we walk on the roads without falling is because of friction. Friction is defined as the force which opposes the motion of one object over the other. Friction has its own advantages and disadvantages and finds application in different situations. Also, learn about the types of friction in Chapter 12.
Following is the table explaining the number of questions that are present in Chapter 12:
| Very short answer type questions | 35 |
| Short answer type questions | 30 |
| Long answer type questions | 5 |
| Multiple-choice questions | 20 |
| Higher-order thinking skills questions | 5 |
| Total questions | 95 |
Chapter 13: Sound
Sound is one of the forms of energy. It is the energy that we can hear. Sound plays a very important role in our daily life. In Chapter 13, we will understand how sound is produced and how it helps us in communicating.
Following is the table explaining the number of questions that are present in Chapter 13:
| Very short answer type questions | 50 |
| Short answer type questions | 25 |
| Long answer type questions | 5 |
| Multiple-choice questions | 20 |
| Higher-order thinking skills questions | 5 |
| Total questions | 105 |
Chapter 14: Chemical Effects of Electric Current
The chemical effects of electric current are an explanation of how liquids behave when they are exposed to electricity and understand the electrical conductivity of various types of liquids. Will the electrical conductivity of liquids help in the production of electricity is an important topic covered in this chapter.
Following is the table explaining the number of questions that are present in Chapter 14:
| Very short answer type questions | 25 |
| Short answer type questions | 15 |
| Long answer type questions | 5 |
| Multiple-choice questions | 20 |
| Higher-order thinking skills questions | 5 |
| Total questions | 70 |
Chapter 15: Some Natural Phenomena
Natural phenomena are something that cannot be controlled by human beings. Nevertheless, there are ways to protect from the destruction that is caused by natural phenomena. Chapter 15 covers two such natural phenomena, and they are earthquakes and lightning.
Following is the table explaining the number of questions that are present in Chapter 15:
| Very short answer type questions | 25 |
| Short answer type questions | 20 |
| Long answer type questions | 5 |
| Multiple-choice questions | 20 |
| Higher-order thinking skills questions | 5 |
| Total questions | 75 |
Chapter 16: Light
Light is a form of energy and is required to see objects around us. Reflection and refraction of light, types of mirrors and what happens to light when it strikes the different types of mirrors are some of the interesting concepts that are covered in this chapter.
Following is the table explaining the number of questions that are present in Chapter 16:
| Very short answer type questions | 40 |
| Short answer type questions | 35 |
| Long answer type questions | 5 |
| Multiple-choice questions | 20 |
| Higher-order thinking skills questions | 5 |
| Total questions | 105 |
Chapter 17: Stars and the Solar System
Celestial bodies, also known as heavenly bodies, are the ones that are present in outer space. This includes all the planets, stars and satellites. Learn about them in Chapter 17, Stars and the Solar System.
Following is the table explaining the number of questions that are present in Chapter 17:
| Very short answer type questions | 45 |
| Short answer type questions | 30 |
| Long answer type questions | 5 |
| Multiple-choice questions | 20 |
| Higher-order thinking skills questions | 5 |
| Total questions | 105 |
Chapter 18: Pollution of Air and Water
The presence of undesirable and harmful substances in the environment is known as a pollutant, and when the concentration of such substances increases in the environment, it is known as pollution. Chapter 18 explains how air and water get polluted and what are the harmful effects and how to minimise them.
Following is the table explaining the number of questions that are present in Chapter 18:
| Very short answer type questions | 10 |
| Short answer type questions | 15 |
| Long answer type questions | 5 |
| Multiple-choice questions | 15 |
| Higher-order thinking skills questions | 5 |
| Total questions | 50 |
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