The Lakhmir Singh Solutions for Class 9 Biology provide students with a detailed picture of each and every chapter in the subject. A wide range of examples is provided related to the concepts and topics covered in the chapter. The solutions provided here are unique, and the answers are explained in detail and in an easy-to-understand manner, along with diagrams wherever necessary.
These solutions cover all sorts of questions like multiple-choice questions, match the following, name the following, fill in the blanks, very short answers, short answers, long answers and also questions based on diagrams. Students will get familiar with how to present the answer in the examination and also the important points that must be included in the answers, which will improve their confidence and thus score high marks in the final exams.
Chapter 1: Improvements in Food Resources
This chapter briefly talks 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. Besides, the topics covered in this chapter include the hybridisation of plants for crop varietal improvement, the difference between manure and fertiliser, crop rotation techniques, poultry farming and animal husbandry, low-cost and high-cost production, and the improvements to be made in crop yield and production.
Chapter 2: Cell – The Fundamental Unit of Life
We know that cells are the fundamental unit of life. The cell is the structural unit 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 chapter mainly deals with the different kinds of cells present in both plants and animals. Also, we will learn how a plant cell is entirely different from an animal cell and 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 previous chapter, we studied the basic fundamental unit of life, the cell. This is the next step. Here, we will study a group of cells called tissue. Also, we will learn about permanent tissue and temporary tissue and 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 the functions they perform, and the major role played by tissues in building up the muscles.
Chapter 4: Diversity in Living Organisms
The variety of living organisms 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 will learn about the classes and about the classification of organisms. Organisms are classified based on their evolution, geographical conditions and also on their nature. Examples of unicellular organisms and multicellular organisms are also provided in this chapter. The classes based on the kingdom, order, species, genus and family, and the biological classification and nomenclature of these species, plants and animals are also explained in detail. 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 will learn mainly about health. Health is a state of being well so that one can perform mental, physical, and social functions properly. This chapter tells us about the factors that determine better health and also the factors that affect our health. Also, we will learn about staying healthy and disease-free, the different types of diseases, causes of diseases, infecting agents and germs, various steps on how to deal with diseases, the precautionary measures to avoid the spreading of diseases, and the ways to maintain a healthy and disease-free lifestyle.
Chapter 6: Natural Resources
The resources which are drawn from nature are called natural resources. In this chapter, we will learn about the basic natural resources given by mother nature, the importance of natural resources, and their judicious use and minimal use. 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 their importance to human life is explained in detail. It also gives us ideas on the conservation of natural resources, wildlife, forest and other natural resources.
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