The textbook of Lakhmir Singh And Manjit Kaur Solutions for class 9 biology gives the students a detailed picture about each and every chapter. A wide range of ideas, concepts and examples related to the topics mentioned in the chapter. The solutions provided here are unique and the answers are explained in a simpler manner. The answers given are in detail and explained diagrammatically wherever necessary.
This book has all sorts of questions like multiple choice questions, match the following, name the following questions,fill in the blanks, very short answers, short answer type questions, long answer type questions and also questions based on diagrams. The students will get to know how to present the answer in the examination and also will come to know about the important points that must be included in the answers. The level of confidence is increased and students will have the urge to learn more.
Chapter 1: Improvements in food resources
This chapter will briefly talk about the variety of food resources we have in the world. It gives us knowledge about the various types of crops we grow during the entire year. It describes the seasons, climate, soil, atmosphere and temperature suitable for the crops which we grow. We will also learn about the hybridization of plants for crop varietal improvement. The difference between manure and fertiliser is given in this chapter. Crop rotation techniques, poultry farming and animal husbandry are the topics covered in this chapter. This chapter also helps in dealing with low cost and high-cost production. The main topic of this lesson deals with the improvements to be made in crop yield and production.
Chapter 2: Cell – The fundamental unit of life
We all know that cells are the fundamental unit of life. Cell is the structural and building block of life. All living organisms in this universe are made up of cells. They either exist as a single cell or as a combination of multiple cells. This lesson mainly deals with the different kinds of cells present in both plants and animals. Here we learn how a plant cell is entirely different from an animal cell. We also learn about the cell structure, size, shape and organelles present in it. Each cell organelle has its own characteristic behaviour and function. The whole biology of an animal or plant is determined by its cell.
Chapter 3: Tissues
Tissue is a group of cells that work together to perform a particular function. In the earlier chapter, we studied the basic fundamental unit of life that is the cell. This is the next step. Here we study a group of cells called tissue. We learn about permanent tissue and temporary tissue. We also get to know about the tissues which help in building the different organs of the body. This chapter highlights the types of tissue present in plants and animals and also about the functions which they perform. The tissues play a major role in building up the muscles depicted in this chapter.
Chapter 4: Diversity In Living Organisms
This variety of living beings present on the earth is called Biodiversity. There is a separate branch of Biology called Taxonomy which identifies, names and classifies different organisms present on the earth. In this chapter, we learn about the classes and about the classification of organisms. This chapter tells us that the organisms are classified based on their evolution, geographical conditions and also on their nature. The example of unicellular organisms, multicellular organisms are mentioned. The classes based on kingdom, order, species, genus and family are explained thoroughly. The biological classification and nomenclature of these species, plants and animals are also taught in this chapter. In short, the entire biology is explained in short in this chapter.
Chapter 5: Why do we fall ill?
The name of this chapter is interesting. This chapter lets us know why we fall ill. Here we learn mainly on health. Health is a state of being well so that one can perform physical, social and mental functions properly. This chapter tells us about the factors that determine the better health and also the factors that affect our health. Here we learn about staying healthy and disease-free. The different types of diseases, causes of diseases, infecting agents and germ. This chapter also includes the various steps on how to deal with diseases and also the precautionary measures to avoid spreading of diseases. The ways to earn a healthy and disease-free lifestyle is described in this chapter.
Chapter 6: Natural resources
The resources which cannot be regained from nature are called natural resources. Here we learn about the basic natural resources given by mother nature. The resources are very important and its judicious use and minimal use are described in this chapter. The chapter also briefs on the hazards that the environment is facing. The different kinds of pollution, global warming, deforestation and about ozone layer depletion. The conservation of natural resources and its importance to human life is discussed in this chapter. This also gives us ideas on conservation of natural resources, wildlife, forest and other natural resources.
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