Biology Class 11 Solutions, MCQ, Notes, Book PDF Download

2026 PYQ Class 12 Biology CBSE Class 12 Biology PYQ 57/1/1 Set – 1 – 2026 CBSE Class 12 Biology PYQ 57/1/2 Set – 2 – 2026 CBSE Class 12 Biology PYQ 57/1/3 Set – 3 – 2026 CBSE Class 12 Biology PYQ 57/2/1 Set – 1 – 2026 CBSE Class 12 Biology PYQ 57/2/2 […]

Q1. Define the following: (a) Exocrine gland Exocrine glands are glands that have ducts and secrete their products onto an epithelial surface or into body cavities. Examples include salivary glands, sweat glands, and sebaceous glands. (b) Endocrine gland Endocrine glands are ductless glands that release hormones directly into the bloodstream, which then travel to target […]

Q1. Briefly describe the structure of the brain. Answer :  The brain is the central information-processing organ of the body, protected by the skull and cranial meninges (dura mater, arachnoid, and pia mater). It has three major parts: 1. Forebrain The forebrain is the largest and most complex part of the brain, consisting of the […]

MCQ Biology Class 11 MCQ Biology Class 11 Solutions Biology Class 11 Question Answer Biology Class 11 Important Questions Biology Class 11 Important Questions Biology Class 11 Notes Biology Class 11 Notes Biology Class 11 Previous Year Question Paper Biology Class 11 Previous Year Question Paper Biology Class 11 Sample Papers Biology Class 11 FREE […]

Unit 1 – Diversity of Living Organism Chapter 1 The Living World Chapter 2 Biological Classification Chapter 3 Plant Kingdom Chapter 4 Animal Kingdom Unit 2 – Structural Organisation ion Plants and Animals Chapter 5 Morphology of Flowering Plants Chapter 6 Anatomy of Flowering Plants Chapter 7 Structural Organisation in Animals Unit 3 – Cell […]

2023-24 Biology Class 11 Unit Test Paper I – (2023-2024) Biology Class 11 Unit Test Paper II – (2023-2024) Biology Class 11  Term I Exam Question Paper – (2023- 2024) ↑ Solution Biology Class 11 Final Term Question Paper – (2023- 2024) ↑ Solution 2019-20 CBSE Class 11 Biology Year 2019 – 2020 2018-19 CBSE […]

Chapter 1 – The Living World Chapter 2 -Biological Classification Chapter 3 -Plant Kingdom Chapter 4 -Animal Kingdom Chapter 5 -Morphology of Flowering Plants Chapter 6 -Anatomy of Flowering Plants Chapter 7 -Structural Organisation in Animals Chapter 8 -Cell The Unit of Life Chapter 9 -Biomolecules Chapter 10 – Cell Cycle and Cell Division Chapter […]

NCERT Book for Class 11 Biology Unit 1: Diversity in the Living World Prelims Chapter 1- The Living World Chapter 2- Biological Classification Chapter 3- Plant Kingdom Chapter 4- Animal Kingdom Unit 2: Structural Organisation in Plants and Animals Chapter 5- Morphology of Flowering Plants Chapter 6- Anatomy of Flowering Plants Chapter 7- Structural Organisation […]

2027 CBSE Class 11 Biology Annual Syllabus 2027 CBSE Class 11 Biology Syllabus 2027 2019 Biology Syllabus Session 2018-19

Unit 1 – Diversity of Living Organism Chapter 1 The Living World Chapter 2 Biological Classification Chapter 3 Plant Kingdom Chapter 4 Animal Kingdom Unit 2 – Structural Organisation ion Plants and Animals Chapter 5 Morphology of Flowering Plants Chapter 6 Anatomy of Flowering Plants Chapter 7 Structural Organisation in Animals Unit 3 – Cell Structure […]

Notes For All Chapters Biology Class 11 CBSE In the previous chapter, you have already learnt that the nervous system in the body, provides point-to-point coordination among the organs. The neural coordination is rapid, but short lived in nature. However, the nerve cells of not reach to each and every cell of the body. So, […]

Notes For All Chapters Biology Class 11 CBSE The human body has several organs. These organs cannot perform their functions independently. In order to maintain homeostasis for the normal physiology of the human body, functions of these organs/organ systems in our body must be coordinated, so that they can work in proper manner. Topic 1 […]

Notes For All Chapters Biology Class 11 CBSE Topic 1 Musculature : Structure and Functions Movement Movement is defined as any visible change of position, exhibited either by the whole organism or any part of the body. It is one of the important characteristics of living organisms. The movement of living things are autonomic (self-sustained) […]

Notes For All Chapters Biology Class 11 CBSE Excretion is the removal of nitrogenous waste products and other metabolites from the animal body which is normally associated with the process of maintenance of osmibtic concentrations, i.e., osmoregulation within the body. Both excretion and osmoregulation are important for the maintenance of homeostasis, i.e., for keeping the […]

Notes For All Chapters Biology Class 11 CBSE Each and every cell of a multicellular organism require food, oxygen and vital components to survive. Simultaneously as a result of metabolism, cell also produces some useful and waste products. Substances that are useful, are transported to other cells, while harmful or waste substances are removed from […]

Notes For All Chapters Biology Class 11 CBSE Cells continuously use oxygen (O2) for the catabolic reactions that releases energy from molecules, e.g., breakdown of nutrient molecules like glucose. Thus, O2 has to be provided to the cells constantly. Simultaneously, these reactions releases carbon dioxide (CO2), which is harmful, so it must be removed quickly and […]

Notes For All Chapters Biology Class 11 Topic 1 Digestion: The System and Associated Glands Animals depend on ready-made food for their nutritional requirements. Nutrition is a process by which animal obtain essential and non-essential substances called nutrients. The way by which organisms derive their nutrients is called mode of nutrition. It is mainly of […]

Notes For All Chapters Biology Class 11 CBSE All plant organs are made up of various kinds of tissues which occupy specific locations within an organ and perform specific designated functions. Thus, the development of a plant follows a very precise pattern, during this period complex body organisation is formed, i.e., produces, roots, leaves, branches, […]

Notes For All Chapters Biology Class 11 CBSE All living organisms require a continuous supply of energy for their survival. Energy is used to carry out various functions such as uptake of materials, absorption, growth, development, movement and even breathing. About 50% of the energy produced by the cell is utilized by these cellular activities […]

Notes For All Chapters Biology Class 11 CBSE All animals including human beings depend on plants for their food. Green plant synthesize the food they need, and for all other organisms depend on them for their needs. Green plants carry out photosynthesis, a physio-chemical processor which they use the light energy to derive the synthesis […]

Notes For All Chapters Biology Class 11 Topic 1 Minerals and Their Importance Living organisms require a number of macromolecules, such as carbohydrates, proteins, fats, water and minerals in order to grow and develop. Thus, the inorganic substances or minerals that provide nourishment to the living organisms or wftrk as a raw material for body […]

Notes For All Chapters Biology Class 11 In flowering plants, a complex movement of materials take place in different directions. This is despite the fact that plants do not bear any circulatory system. Water taken up by the roots has to reach all the parts of the plant, up to very tip of the growing […]

Notes For All Chapters Biology Class 11 CBSE Each and every organism begins its life from single cell and grows to form large organism. All living cells grow in size and reproduce by dividing into two daughter cells, i.e., each parental cell divide and give rise to two daughter cells each time it divide, which […]

Notes For All Chapters Biology Class 11 CBSE A cell is composed of variety of molecules (like carbon, hydrogen, oxygen) which perform various functions. Other than these basic elements, some metals and non-metals are also present as cellular materials, thence, all these materials combines in different ways in order to form various biomolecules, which are […]

Notes For All Chapters Biology Class 11 CBSE Topic 1 Cell :An Overview An organism consist of one or more cells, accordingly there are two types of organisms, i.e., unicellular (composed of single cell) and multi cellular (composed of many cells). Cell Theory The cell theory was formulated by two German Scientists, Matthias Schneider and […]

Notes For All Chapters Biology Class 11 CBSE Topic 1: Animal Tissues Tissue All cells are well organised and coordinated to work in a group. A group of similar cells along with intercellular substances perform a specific function, such an organisation is called tissue. The term ‘Tissue’ was introduced by Bichat and he is known […]

Notes For All Chapters Biology Class 11 CBSE This chapter introduces the internal structure and functional organisation of higher plants. The study of internal structure of plant is called anatomy. 1. Tissues and Tissue Systems The plants have cells as their basic unit. Compared to animal cells, plant cells have a cell wall consisting of […]

Notes For All Chapters Biology Class 11 CBSE The angiosperms or flowering plants show a large diversity in external structure called as morphology (Gk. Morphe—form; logos—study). However, they all are characterised by the presence of roots, stems, leaves, flowers and fruits. 1. Flowering Plants The plant body consists of a main axis, which may be […]

Notes For All Chapters Biology Class 11 CBSE There are over a million species of animals that have been described till now. These vast species have diverse structural forms. Therefore, the need for classification of animals becomes very important. 1. Animals : Features & Basis of Classification The classification helps in easy identification and also […]

Notes For All Chapters Biology Class 11 CBSE 1.Basis of Classification and Algae, Bryophytes & Pteridophytes Our understanding of the plant kingdom has changed over time. Fungi and members of the Monera and Protista having cell walls have not been separated form Plantae, the earlier classifications kept them in the same kingdom. The kingdom-Plantae has […]

Notes For All Chapters Biology Class 11 CBSE Biological classification is the scientific procedure of arranging organisms in a hierarchical series of groups and sub-groups on the basis of their similarities and dissimilarities. 1.Need of Classification There have been many attempts to classify living organisms since ancient times. Aristotle was the earliest to attempt a […]

Notes For All Chapters Biology Class 11 CBSE 1.Living World: Characteristics The earth serves as a home for diverse living organisms. The organisms live in various habitats like forests, mountains, deserts, oceans, freshwater bodies, hot springs, polar regions and almost every place of the earth. Living things possess certain characteristics, which makes Some of these […]

The Living World MCQ Chapter 1 Biology Class 11 Biological Classification MCQ Chapter 2 Biology Class 11 Plant Kingdom MCQ Chapter 3 Biology Class 11 Animal Kingdom MCQ Chapter 4 Biology Class 11 Morphology Of Flowering Plants MCQ Chapter 5 Biology Class 11 Anatomy Of Flowering Plants MCQ Chapter 6 Biology Class 11 Structural Organisation […]