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Aakash Lakhmir Singh Solutions for Class 9 Biology

Class 9 th marks the class when the science is split into various components- Physics, Chemistry, and Biology. The former two subjects are primarily based on maths and reasoning, where the latter is entirely a theory and natural process based subject. The students mostly get confused by the life processes or the principles that explain these processes. Nevertheless, confusion cannot and should not stop them because this is a very important subject; after all, it teaches about life itself. Thus, the Aakash Institute provides the necessary aid in the form of the Lakhmir Singh Solutions for class 9 th Biology. The solutions contain answers to the doubt that can arise in the following chapters:

Aakash Lakhmir Singh Solutions for Class 9 Biology Chapters:


Chapter 1: Improvement in food resources

This chapter briefly describes the numerous ways to improve our food resources to fulfil the needs of living organisms. The grown crop is a source of nutrition to every living being, be it human, animals, or microorganism. Students get to know about the importance of these resources and how our lives depend on these resources. The primary goal of this chapter is to explain various agricultural techniques along with their uses. This chapter, 'Improvement in food resources", gives an overview of the variety of crops grown throughout the year. Thus, students can have in-depth knowledge of the various factors like climate, season, soil, and temperature that affect these crops and how our ecosystem maintains these for crop benefits.

This chapter further describes the sources of nutrients and the quantity required for plant growth. This text familiarises the student with the comparative tabulated form of macro or micronutrition with a slight mention of how plants absorb these nutrients. Students understand the significance of plant nutrients and analyse the functioning of nutrients in plant biological processes through the chapter. It teaches students about the hybridisation process for improving crop variety and its described detailed methods. Its application, advantages, and limitations are well depicted in this chapter.

This chapter's centre of attraction introduces manure and fertiliser and how it is applied in the field to increase productivity. It moreover highlights the discrepancy between manure and fertilisers and their impact on the ecosystem. The types of manures and how their application affects the soil helps students in learning without declining their interest. Students get to know about the infinite advantages of manure. Knowing about the various limitations serve as a positive way to increase crop productivity. Some significant features are:

  • Good source of macronutrients
  • Improves soil fertility
  • Reduce soil erosion and leaching
  • Improves water holding capacity

This chapter deeply focuses on eutrophication. It is considered a significant atmospheric change due to the use and accumulation of chemical fertilisers in water sources, which causes water pollution. This chapter further explains the application of fertilisers over manure and its effects on the property of soil. This chapter influences the students to acquire knowledge of some dominant techniques like crop rotation, irrigation, animal husbandry, and poultry farming and why they are essential for crop improvement. The chapter concludes by giving the requisite information on high or lost cost production and the association of microorganisms in bio-fertilisers promoting plant growth.

Chapter 2: Fundamental unit of life- Cells:

This chapter highlights the fundamental unit of life- CELL, as all living organisms are created from a single cell. This lesson elaborates on cell theory. It deals with cells' structural and biological function comprising either a single cell (unicellular) or a combination of cells (multicellular). The main goal of this chapter is to explain how life was created from a single cell, along with the mention of scientists involved in observing cells. Thus, students thoroughly understand the concept of a cell as a unit of life and get illustrated information on the cell's functions in various biological processes.

It shows students the microscopic view of the cell, and they get to learn about the unique features of cells like their shape, sizes and how to easily differentiate them. The students learn about the characteristics of cells and explore more insights into the solid cell framework. Students get to know about the difference between plant and animal cells, along with the types of cell organelles present in them. Each organelle and its functions are well explained in this chapter. It moreover highlights the characteristics of each organelle present in prokaryotes and eukaryotes with their unique features. Students can discover the difference between light and electron microscope and their purpose to observe these cells. The primary cell organelle represents:

  • Nucleolus
  • Endoplasmic reticulum
  • Golgi bodies
  • Ribosomes
  • Mitochondria
  • Chloroplast etc

This chapter also investigates the features of the nucleoid and nucleus that perform a crucial role in inheritance. Students get to know about the relevant aliases like protein factory, Suicidal bags, storage of food, and the cell's powerhouse, leading to a much broader knowledge of the concept. The chapter further examines the plasma membrane constituents and the model used to depict the plasma membrane structure.

Students are also taken through an experiment on the diffusion and osmosis process to analyse the condition of cells placed in various stressed environments like hypertonic, hypotonic, etc., and how cells tolerate the high temperature or pH Level. This lesson introduces the student to a new term, endocytosis and its types in detail.

Chapter 3: Tissues

This lesson explores and clarifies the concept to furnish a basic idea where a group of cells performs a specialised function and is called tissue. The chapter adequately explains the following level after cells to tissues and then differentiate into an organ system. This chapter, 'TISSUES', is centred more on the different characteristics of tissues with detailed information on tissue types. Thus, the students must be aware of the importance of tissues in providing structural or mechanical strength. It further explains the differentiation of tissues in both plant or animal cells.

The chapter focuses on the types of tissues present in plants and animals and points out the tabulated difference between plant tissues and animal tissues. This chapter primarily comprises the classification of plant cells into two types- meristematic or permanent tissue. It further classifies plant tissues into three types including:

  • Epidermis tissue
  • Vascular tissue
  • Ground tissue

The primary goal of this lesson is to focus on the deep explanation of Xylem and phloem tissue with their constituents. Each plant tissue with its features and well-depicted diagrams is presented in a precise manner. This text provides essential information on meristem types along with their central functions. The lesson further highlights the key points of simple tissue and its three types to understand the mysterious elements of plants.

Another vital piece of information shown to students is the difference between Xylem and phloem and comparing the constituent elements present in them. Students further study the four types of animal tissues which are as following:

  • Muscle tissue
  • Connective tissue
  • Epithelial tissue
  • Nervous tissue

It introduces students to the origin of animal tissue and its significance in building organ systems. Each function of the different animal tissues and how they are directly involved in the functioning of biological life has been explored in the chapter. The deformities in tissue that lead to a tremendous impact on health and become the dominant reason for many disorders are also explored. It further delves deeper to describe the principal role in building these muscles and how these movements of muscles take place. Students also learn the involvement of hormones and enzymes secreted by these tissues and their function in day-to-day life processes. This chapter concluded by presenting diseases related to tissue and the tools used to study tissues.

Chapter 4: Diversity in a living organism:

This chapter, "Diversity in a living organism", explores the world of biodiversity consisting of uncountable species and classification. In much of the chapter, though, the author highlights the branch of biology named Taxonomy which identifies the different organisms and categorises them into separate classes based on some unique features. The chapter's unique approach is commendable in teaching the nomenclature of different organisms and their significance on the branch of microbiology, botany, and zoology. Thus, students discover the purpose behind the classification of species which helps students clarify their concepts thoroughly. This lesson teaches students about the hierarchy of classification, five kingdoms classification mentioning the scientist involved. The seven categories of hierarchy classification involve:

  • Kingdom
  • Phylum
  • Class
  • Order
  • Family
  • Genus
  • Species

Each hierarchy consists of unique features following the descending level. It introduces students to the values of biodiversity and the various types of species diversity with examples observed nearby. It further explains the evolution process and their founder's name, who proposed the theory of evolution. This topic also provides essential information about binomial nomenclature and their fixed rules to write the genus or species name.

It further discusses the classification based on geographical condition, evolution, and environmental factors with the slight mention of various examples of unicellular and multicellular organisms. Thus, the students thoroughly understand the entire taxonomy explained in this chapter. The chapter further provides a broader idea about the disadvantages of two-kingdom classification and the reasons behind the presently used five-kingdom classification: Monera, Protista, Fungi, Plantae, and Animalia. Students also learn about the characteristic features of every kingdom with examples. The further two divisions of the plant kingdom- cryptogáme and phanérogame, including the further subdivided class analysis are also defined in this chapter. It explains the features of Thallophyta, Bryophyta, Pteridophyta, gymnosperms, and angiosperms and what makes them distinct from each other.

This text also highlights the comparison between monocots and dicots with examples from a different source. Students also learn the numerous classes under animal kingdoms outlining detailed features with examples. Additionally, this chapter introduces students to some unique species of 'lichen', making it more interesting to investigate this unique area.

Chapter 5: Why do we fall ill

This chapter sets a question in learners' minds to increase their curiosity and drives their minds to think about the dominant reason behind illness. This chapter deals with the fundamental knowledge of the term 'Health' represented as a state of being well and performing physical, mental, or emotional functions properly. This chapter, 'WHY DO WE FALL ILL', provides requisite information about the cause of illness and precautionary measures to prevent infection. It further explains the significance of health and must be considered as a human's priority in their life. Another vital area is to distinguish between healthy or disease-free people.

The principal goal of this chapter is to increase the understanding of disease and its impact on human health. It familiarises the students with the origin of the disease and the pathological process associated with specific symptoms. This chapter outlines the diverse causative agents and how these became a leading disaster in human health. It further explains the two types of disease, which includes:

  • Acute infection
  • Chronic infection

This chapter also investigates the diagnosis of numerous diseases and the strategies developed by our body to resist the infection. It explains the environmental or biological factors that affect human health. The chapter further examines the difference between signs and symptoms that help students nurture their minds. This chapter highlights the numerous diseases with examples and the symptoms associated with them. The transmissible pathways of spreading the disease are well explained, making it more straightforward for the students to clear the concepts thoroughly.

This chapter tells about the specific disease in brief, like AIDS, diarrhoea, malaria, cholera, etc., along with preventive measures. This lesson moreover elucidates the application of antibiotics encircling in our daily life. Students get to know about the importance of vaccines as a leading factor to prevent numerous diseases. The second leading factor is to adopt some good habits to strengthen our immune system. It familiarises students with a balanced diet and its importance in our day-to-day life in the form of a statement "prevention is better than cure". This chapter further provides imperative information about how our body reacts to pathogen entry so that students can establish a solid framework of understanding that can better support the learning process. This chapter suggests some ways for the government to provide clean drinking water and manage solid waste properly.

Chapter 6: Natural resources

This chapter, "Natural resources", explores the world of the primary resources provided by our mother nature and its relation with the ecosystem. In much of the chapter, though, the author highlights the abiotic and biotic components of the biospheres and their significance. However, he also claims that human life would not exist without these natural resources. The chapter has a unique approach to teaching the importance of natural resources in our life so that students thoroughly understand the concept and understand all environmental hazards. This lesson influences students to conserve these natural resources and efficient ways to use them sustainably.

The lesson teaches us the composition of air and how gases remain nearly constant in the environment. It further explains the role of the atmosphere in keeping the temperature steady. This topic also provides essential information about the various factors influencing the air movement that leads to wind production. It introduces students to components of air pollution and its effect on human health. The chapter also elaborates its effect on our environment by depletion of the ozone layer and greenhouse effects. It further discusses the causes of acid rain and its detrimental consequences faced by nature.

This chapter tells the students about the natural or man-made sources of air pollution and includes a brief explanation of smog. It further provides a broader idea about global warming and its constant effect on the weather. Students also learn about cloud formation and how rain is produced. Additionally, this chapter discusses the importance of water resources and the dominant cause of water pollution. It explains the water movement through transpiration and evaporation, which constitutes the water cycle. This text also highlights the effect of water pollution on the aquatic organism as well as on human health.

It further elaborates on the soil resources and their component mix with organic matter. This text delves deeper into soil pollution and its major effect on the environment. Soil erosion is the dominant form of soil degradation that causes loss of topsoil and reduces crop productivity. Students also familiarise themselves with biogeochemical cycles like carbon, nitrogen, and oxygen cycle and their association with microorganisms. Students also learn the numerous ways to conserve these sources by organising various programs to spread awareness and apply 3R in our day-to-day lives.

FAQ For class 9 Biology Lakhmir Singh Science solution

Q1- Why Lakhmir Singh Biology solutions are recommended for students in class 9th?
Ans- Biology is a theory-based subject that requires students to nurture their minds and deeply focus on understanding the chapters thoroughly. And Aakash Institute's Lakhmir Singh solution for class 9 th Biology provides a wide range of ideas, concepts, well-depicted diagrams, and examples related to the topic. It clarifies all doubts in detail, providing an understanding of a complex topic in the most efficient way by providing answers supported by practical examples from everyday life. The main purpose is to increase students' learning capacity, assessing their understanding, memory of information, analytical thinking, and ability to solve problems. It provides answers to numerous conceptual, short, and multiple- choice question approaches for learning the basics and acquiring scientific insights.

Q-2 Who prepares these Lakhmir Singh Biology solutions?
Ans- Aakash institute provides these solutions furnished by well-experienced professors who formulate the ideal answer to every question. The Aakash Institute provides answers to conceptual questions that focus on students' ability to develop their capacity and apply them in real-life examples. It ensures the quality of the solution and helps young minds to focus on both theoretical and practical approaches. All solutions are appropriate and based on the latest CBSE standards.

Q-3 Where to find and download Lakhmir Singh solution for class 9th Biology?
Ans- Aakash Lakhmir Singh solutions are available on the official Aakash website. Each section consists of topic-wise questions and can easily be downloaded in pdf format. All solutions are relevant and based on the NCERT syllabus. Aakash institute also provides PDF files of Lakhmir Singh solution for physics and chemistry for class 9th.

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