NCERT Solutions for Class 11 Biology (Updated for 2021

Download Chapter wise NCERT Solutions For Class 11 Biology

NCERT Solutions Class 11 Biology is one of the best learning guides students can use for their exam preparation. It covers important questions with comprehensive answers. Furthermore, all solutions are presented in an easy-to-understand format. The NCERT Solutions are present in PDF version which can be accessed effortlessly by the students. The faculty design the solutions in an understandable manner to boost the exam preparation of students. They primarily help the students to analyse the areas of weakness and work on them for a better score. By using these solutions, students will be able to answer all the questions from the NCERT Textbook.

Students find difficulty in choosing the right study material which satisfies their needs. For this purpose, we at BYJU’S provide chapter wise solutions in both online and offline mode to fit the necessities of students. The NCERT Solutions for Class 11 one of the best reference guide for the Class 11 students who are working hard to reach their career goals.

Biology NCERT Solutions Class 11 Chapterwise

Typically, you might just read a concept and try to memorise it. You might not even grasp the topic, and yet, you have to memorise it because it is a crucial part of your exam. This is where these solutions come into the picture – the prescribed answers are reconstituted into a language that is simple to understand and easy to remember. The content is designed by a team of highly qualified professionals that analyse the average mental competency of students in Class 11. This translates to content which is tailor-made for students, making it easy to gain an in-depth insight into the subject.

Download Class 11 NCERT Solutions for Biology to kick-start your exam preparations.

NCERT Solutions Class 11 Biology

NCERT Solutions Class 11 Biology is a valuable resource not just from the point of Class 11 examination, but also from the point of entrance exams like NEET, JEE, medical entrance exams, and various other competitive exams. Our experts at BYJU’S have created these solutions to help students to grasp maximum information with minimal mental strain.

It includes answers elaborated in a relatively simple language. Students can easily access topic wise Class 11 Biology NCERT Solutions of every Chapter and unit covered in the biology textbooks. These solutions explain important concepts such as biological classification, animal and plant kingdoms, morphology, structural Organization, biomolecules, cell division, transport in plants, nutrition, photosynthesis, and more. NCERT Solutions Class 11 Biology PDF is also provided with the study materials, so that students can access content offline.

NCERT Solutions Class 11 Biology Chapter Details and Exercises

Chapter 1: The Living World – Term I

This chapter elaborates fundamental concepts such as “What is Living?” Diversity in the Living World, Taxonomic Categories, Taxonomical Aids and more. The living world is rich in variety. Millions of plant and animal species have been identified and described till date, but countless more remain yet to be discovered. The taxonomic studies of various species of plants and animals are useful in agriculture, forestry, industry and in general for knowing our resources and their diversity. Taxonomists have developed a variety of taxonomic aids to facilitate identification, naming and classification of organisms.

Topics Covered in Class 11 Biology Chapter 1 The Living World for First Term:

What is living? Biodiversity; Need for classification; three domains of life; concept of species and taxonomical hierarchy; binomial nomenclature.

Also access the following resources for Class 11 Chapter 1 The Living World at BYJU’S:

Chapter 2: Biological Classification – Term I

In this chapter, we will study characteristics of Kingdoms Monera, Protista and Fungi of the Whittaker system of classification. The Kingdoms Plantae and Animalia, commonly referred to as plant and animal kingdoms, respectively, will be dealt with separately in Chapters 3 and 4. In the biological classification, you will also study about Kingdom Monera, Kingdom Protista, Kingdom Fungi, Kingdom Plantae, Kingdom Animalia, Viruses, Viroids and Lichens.

Topics Covered in Class 11 Biology Chapter 2 Biological Classification for First Term:

Five kingdom classification; Salient features and classification of Monera, Protista and Fungi into major groups; Lichens, Viruses and Viroids.

Also access the following resources for Class 11 Chapter 2 Biological Classification at BYJU’S:

Chapter 3: Plant Kingdom – Term I

In the previous chapter, we looked at the broad classification of living organisms under the system proposed by Whittaker (1969) wherein he suggested the Five Kingdom classification viz. Monera, Protista, Fungi, Animalia and Plantae. In this chapter, we will delve into detail with further classification within the Kingdom Plantae or the ‘plant kingdom’. Also, you will get to learn concepts such as Algae, Bryophytes, Pteridophytes, Gymnosperms, Angiosperms, Plant Life Cycles and Alternation of Generations.

Topics Covered in Class 11 Biology Chapter 3 Plant Kingdom for First Term:

Salient features and classification of plants into major groups – Algae, Bryophyta, Pteridophyta and Gymnospermae. (salient and distinguishing features and a few examples of each category).

Also access the following resources for Class 11 Chapter 3 Plant Kingdom at BYJU’S:

Chapter 4: Animal Kingdom – Term I

When we look around, we observe different animals with different structures and forms. Over a million species of animals have been described until now, the need for classification becomes all the more important. The classification also helps in assigning a systematic position to newly described species. It also teaches other topics such as Basis of Classification, Classification of Animals and more. Students will learn about the animal kingdom in brief in this chapter.

Topics Covered in Class 11 Biology Chapter 4 Animal Kingdom for First Term:

Salient features and classification of animals, non-chordates up to phyla level and chordates up to class level (salient features and distinguishing features of a few examples of each category). (No live animals or specimen should be displayed.)

Also access the following resources for Class 11 Chapter 4 Animal Kingdom at BYJU’S:

Chapter 5: Morphology of Flowering Plants – Term I

In chapters 2 and 3, we talked about the classification of plants based on morphological and other characteristics. For any successful attempt at classification and at understanding any higher plant (or for that matter any living organism), we need to know standard technical terms and standard definitions. We also need to know about the possible variations in different parts, found as adaptations of the plants to their environment, e.g., adaptions to various habitats, for protection, climbing, storage. Morphology of Flowering Plants also explains topics such as the root, stem, leaf, inflorescence, flower, fruit, seed, semi-technical description of a typical flowering plant, description of some important families and more.

Topics Covered in Class 11 Biology Chapter 5 Morphology of Flowering Plants for First Term:

Morphology of inflorescence and flower, Description of 01 family: Solanaceae or Liliaceae (to be dealt along with the relevant experiments of the Practical Syllabus).

Also access the following resources for Class 11 Chapter 5 Morphology of Flowering Plants at BYJU’S:

Chapter 6: Anatomy of Flowering Plants

This chapter introduces the internal structure and functional organisation of higher plants. Study of the internal structure of plants is called anatomy. Plants have cells as their basic unit, cells are organised into tissues, and in turn, the tissues are organised into various parts of the plant. Within angiosperms, the monocots and dicots are anatomically different. Internal structures also show adaptations to diverse environments. It includes topics such as The Tissues, The Tissue System, Anatomy of Dicotyledonous and Monocotyledonous Plants, Secondary Growth and more.

Also access the following resources for Class 11 Chapter 6 Anatomy of Flowering Plants at BYJU’S:

Chapter 7: Structural Organisation in Animals – Term I

In the preceding chapters, we came across a large variety of organisms, both unicellular and multicellular, of the animal kingdom. In unicellular organisms, all functions like digestion, respiration and reproduction are performed by a single cell. In the complex body of multicellular animals, the same basic functions are carried out by different groups of cells in a well-organised manner. All complex animals consist of only four basic types of tissues. These tissues are organised in specific locations to form organs – such as the stomach, lung, heart and kidney. Students can understand the structural organisation in animals and score well in the exam by referring to the solutions available at BYJU’S.

Topics Covered in Class 11 Biology Chapter 7 Structural Organisation in Animals for First Term:

Animal tissues.

Also access the following resources for Class 11 Chapter 7 Structural Organisation in Animals at BYJU’S:

Chapter 8: Cell The Unit of Life – Term I

When you look around, you see both living and non-living things. You must have asked yourself – “What is it that makes an organism living?” or, “What is it that an inanimate object does not have which a living thing has?” The answer to this is the presence of the basic unit of life – the cell in all living organisms. All organisms are composed of cells. Some are composed of a single cell and are called unicellular organisms. In contrast, others, like us, are composed of many cells and are called multicellular organisms.

Topics Covered in Class 11 Biology Chapter 8 Cell The Unit of Life for First Term:

Cell theory and cell as the basic unit of life, structure of prokaryotic and eukaryotic cells; Plant cell and animal cell; cell envelope; cell membrane, cell wall; cell organelles – structure and function; endomembrane system, endoplasmic reticulum, golgi bodies, lysosomes, vacuoles, mitochondria, ribosomes, plastids, microbodies; cytoskeleton, cilia, flagella, centrioles (ultrastructure and function); nucleus.

Also access the following resources for Class 11 Chapter 8 Cell The Unit of Life at BYJU’S:

Chapter 9: Biomolecules – Term I

There is a wide diversity in living organisms in our biosphere. A few other topics included in this chapter are How to Analyse Chemical Composition? Primary and Secondary Metabolites, Biomacromolecules, Proteins, Polysaccharides, Nucleic Acids, Structure of Proteins, Nature of Bond Linking Monomers in a Polymer, Dynamic State of Body Constituents – Concept of Metabolism, Metabolic Basis for Living, The Living State, Enzymes. Students will be able to get a good hold on these topics by referring to the NCERT Solutions for Class 11 Biology Chapter 9 Biomolecules from BYJU’S.

Topics Covered in Class 11 Biology Chapter 9 Biomolecules for First Term:

Chemical constituents of living cells: biomolecules, structure and function of proteins, carbohydrates, lipids, nucleic acids; Enzymes- types, properties, enzyme action.

Also access the following resources for Class 11 Chapter 9 Biomolecules at BYJU’S:

Chapter 10: Cell Cycle and Cell Division – Term II

Growth and reproduction are characteristics of cells, indeed of all living organisms. All cells reproduce by dividing into two, with each parental cell giving rise to two daughter cells each time they divide. These newly formed daughter cells can themselves grow and divide, giving rise to a new cell population that is formed by the growth and division of a single parental cell and its progeny. In other words, such cycles of growth and division allow a single cell to form a structure consisting of millions of cells. Other subtopics mentioned in the chapter are Cell Cycle, M Phase, Significance of Mitosis, Meiosis, Significance of Meiosis.

Topics Covered in Class 11 Biology Chapter 10 Cell Cycle and Cell Division for Second Term:

Cell cycle, mitosis, meiosis and their significance

Also access the following resources for Class 11 Chapter 10 Cell Cycle and Cell Division at BYJU’S:

Chapter 11: Transport in Plants

Topics in the chapter Transport in Plants include Means of Transport, Plant-Water Relations, Long Distance Transport of Water, Transpiration, Uptake and Transport of Mineral Nutrients, Phloem, Transport: Flow from Source to Sink. Plants obtain a variety of inorganic elements (ions) and salts from their surroundings, especially from water and soil. In higher plants, there is a vascular system comprising of xylem and phloem, responsible for translocation. Phloem is responsible for transport of food (primarily) sucrose from the source to the sink. The translocation in phloem is explained by the pressure-flow hypothesis.

Also access the following resources for Class 11 Chapter 11 Transport in Plants at BYJU’S:

Chapter 12: Mineral Nutrition

This chapter focuses mainly on inorganic plant nutrition, wherein we will study the methods to identify elements essential to the growth and development of plants and the criteria for establishing the essentiality. We will also study the role of the essential elements, their major deficiency symptoms and the mechanism of absorption of these essential elements. The chapter Mineral Nutrition also provides a brief introduction to the significance and the mechanism of biological nitrogen fixation.

Also access the following resources for Class 11 Chapter 12 Mineral Nutrition at BYJU’S:

Chapter 13: Photosynthesis in Higher Plants – Term II

All animals, including human beings, depend on plants for their food. The green plants make or rather synthesise the food they need through photosynthesis and are therefore called autotrophs. Green plants carry out ‘photosynthesis’, a physicochemical process which uses light energy to drive the synthesis of organic compounds. Photosynthesis is important due to two reasons: it forms the basis for all known food chains on earth. It is also responsible for the release of oxygen into the atmosphere by green plants. This chapter focusses on the structure of the photosynthetic machinery and the various reactions that transform light energy into chemical energy.

Topics Covered in Class 11 Biology Chapter 13 Photosynthesis in Higher Plants for Second Term:

Photosynthesis as a means of autotrophic nutrition; site of photosynthesis, pigments involved in photosynthesis (elementary idea); photochemical and biosynthetic phases of photosynthesis; cyclic and non-cyclic photophosphorylation; chemiosmotic hypothesis; photorespiration; C3 and C4 pathways; factors affecting photosynthesis.

Also access the following resources for Class 11 Chapter 13 Photosynthesis in Higher Plants at BYJU’S:

Chapter 14: Respiration in Plants – Term II

This chapter deals with cellular respiration or the mechanism of breakdown of food materials within the cell to release energy, and the trapping of this energy for the synthesis of ATP. This chapter also elaborates topics such as “Do Plants Breathe?” Glycolysis, Fermentation, Aerobic Respiration, The Respiratory Balance Sheet, Amphibolic Pathway, Respiratory Quotient. The important concepts of this chapter Respiration in Plants is explained in a simple language to make learning easier for the Class 11 students.

Topics Covered in Class 11 Biology Chapter 14 Respiration in Plants for Second Term:

Exchange of gases; cellular respiration – glycolysis, fermentation (anaerobic), TCA cycle and electron transport system (aerobic); energy relations – number of ATP molecules generated; amphibolic pathways; respiratory quotient.

Also access the following resources for Class 11 Chapter 14 Respiration in Plants at BYJU’S:

Chapter 15: Plant Growth and Development – Term II

We have already studied the organisation of a flowering plant in Chapter 5. In this chapter, we shall explore some of the factors which govern and control these developmental processes. These factors are both intrinsic (internal) and extrinsic (external) to the plant. Other subtopics are Growth Differentiation, Dedifferentiation and Redifferentiation, Development, Plant Growth Regulators, Photoperiodism, Vernalisation and more. At BYJU’S, the highly experienced faculty have designed the solutions of Plant Growth and Development in order to help students ace the final exam.

Topics Covered in Class 11 Biology Chapter 15 Plant Growth and Development for Second Term:

Growth regulators – auxin, gibberellin, cytokinin, ethylene, ABA.

Also access the following resources for Class 11 Chapter 15 Plant Growth and Development at BYJU’S:

Chapter 16: Digestion and Absorption

Food is one of the basic requirements of all living organisms. The major components of our food are carbohydrates, proteins and fats. Vitamins and minerals are also required in small quantities. Food provides energy and organic materials for growth and repair of tissues. The water we take in plays an important role in metabolic processes and also prevents dehydration of the body. Biomacromolecules in food cannot be utilised by our body in their original form. They have to be broken down and converted into simple substances in the digestive system. This process of conversion of complex food substances to simple absorbable forms is called digestion and is carried out by our digestive system by mechanical and biochemical methods. These concepts are briefly explained in the chapter Digestion and Absorption to help students understand them effectively.

Also access the following resources for Class 11 Chapter 16 Digestion and Absorption at BYJU’S:

Chapter 17: Breathing and Exchange of Gases – Term II

As you have read earlier, oxygen is utilised by the organisms to indirectly break down simple molecules like glucose, amino acids, fatty acids, etc., to derive energy to perform various activities. Carbon dioxide, which is harmful, is also released during the above catabolic reactions. It is, therefore, evident that oxygen has to be continuously provided to the cells and carbon dioxide produced by the cells have to be released out. This process of exchange of oxygen from the atmosphere with carbon dioxide produced by the cells is termed as breathing. It is also known as respiration.

Topics Covered in Class 11 Biology Chapter 17 Breathing and Exchange of Gases for Second Term:

Respiratory organs in animals (recall only); Respiratory system in humans; mechanism of breathing and its regulation in humans – exchange of gases, transport of gases and regulation of respiration, respiratory volume; disorders related to respiration – asthma, emphysema, occupational respiratory disorders.

Also access the following resources for Class 11 Chapter 17 Breathing and Exchange of Gases at BYJU’S:

Chapter 18: Body Fluids and Circulation – Term II

We have learnt that all living cells have to be provided with nutrients, oxygen and other essential substances. Also, the waste or harmful substances produced have to be removed continuously for healthy functioning of tissues. Blood is the most commonly used body fluid in most of the higher organisms, including humans. Another body fluid, lymph, also helps in the transport of certain substances. In this chapter, we shall explore the composition and properties of blood and lymph (tissue fluid) and the mechanism of circulation of blood is also explained herein.

Topics Covered in Class 11 Biology Chapter 18 Body Fluids and Circulation for Second Term:

Composition of blood, blood groups, coagulation of blood; composition of lymph and its function; human circulatory system – Structure of human heart and blood vessels; cardiac cycle, cardiac output, ECG; double circulation; regulation of cardiac activity; disorders of circulatory system – hypertension, coronary artery disease, angina pectoris, heart failure.

Also access the following resources for Class 11 Chapter 18 Body Fluids and Circulation at BYJU’S:

Chapter 19: Excretory Products and their Elimination – Term II

The chapter covers topics such as Human Excretory System, Urine Formation, Function of the Tubules, Mechanism of Concentration of the Filtrate, Regulation of Kidney Function, Micturition, Role of other Organs in Excretion, Disorders of the Excretory System and more.

Topics Covered in Class 11 Biology Chapter 19 Excretory Products and their Elimination for Second Term:

Modes of excretion – ammonotelism, ureotelism, uricotelism; human excretory system – structure and function; urine formation, osmoregulation; regulation of kidney function – renin – angiotensin, atrial natriuretic factor, ADH and diabetes insipidus; role of other organs in excretion; disorders – uremia, renal failure, renal calculi, nephritis; dialysis and artificial kidney, kidney transplant.

Also access the following resources for Class 11 Chapter 19 Excretory Products and their Elimination at BYJU’S:

Chapter 20: Locomotion and Movement – Term II

Movement is one of the significant features of living beings. Animals and plants exhibit a wide range of movements. Such voluntary movements are called locomotion. Walking, running, climbing, flying, and swimming are all forms of locomotory movement. Locomotory structures need not be different from those affecting other types of movements. Methods of locomotion performed by animals vary with their habitats and the demand of the situation. Locomotion is required for a variety of reasons such as finding food, shelter, mate, suitable breeding grounds, favourable climatic conditions or to escape from predators.

Topics Covered in Class 11 Biology Chapter 20 Locomotion and Movement for Second Term:

Skeletal muscle, contractile proteins and muscle contraction.

Also access the following resources for Class 11 Chapter 20 Locomotion and Movement at BYJU’S:

Chapter 21: Neural Control and Coordination – Term II

Coordination is the process through which two or more organs interact and complement the functions of one another. In our body, the neural system and the endocrine system jointly coordinate and integrate all the activities of the organs so that they function in a synchronised fashion. In this chapter, we will learn about the neural system of human, mechanisms of neural coordination like transmission of nerve impulse, impulse conduction across a synapse and the physiology of reflex action.

Topics Covered in Class 11 Biology Chapter 21 Neural Control and Coordination for Second Term:

Neuron and nerves; Nervous system in humans – central nervous system; peripheral nervous system and visceral nervous system; generation and conduction of nerve impulse.

Also access the following resources for Class 11 Chapter 21 Neural Control and Coordination at BYJU’S:

Chapter 22: Chemical Coordination and integration – Term II

We have already learnt that the neural system provides point-to-point rapid coordination among organs. Neural coordination is fast but short-lived. As the nerve fibres do not innervate all cells of the body and the cellular functions need to be continuously regulated; a special kind of coordination and integration has to be provided. This function is carried out by hormones. The neural system and the endocrine system jointly coordinate and regulate the physiological functions in the body. Students can learn the chemical coordination and integration more efficiently by referring to the NCERT Solutions from BYJU’S.

Topics Covered in Class 11 Biology Chapter 22 Chemical Coordination and Integration for Second Term:

Endocrine glands and hormones; human endocrine system – hypothalamus, pituitary, pineal, thyroid, parathyroid, adrenal, pancreas, gonads; mechanism of hormone action (elementary idea); role of hormones as messengers and regulators, hypo – and hyperactivity and related disorders; dwarfism, acromegaly, cretinism, goiter, exophthalmic goiter, diabetes, Addison’s disease.
Note: Diseases related to all the human physiological systems to be taught in brief.

Also access the following resources for Class 11 Chapter 22 Chemical Coordination and Integration at BYJU’S:

Academically, learning about these concepts might be overwhelming due to the sheer magnitude of information in each concept. However, with these carefully crafted study tips, the experience becomes effective and interesting. Students can access and download the NCERT Class 11 Books here.

CBSE Marking Scheme 2021-22

The academic sessions by the CBSE board are divided into two terms for the year 2021-22. The entire syllabus are equally divided so that students can spend much time and learn the fundamental concepts with ease. The main purpose is to help students understand the link between the concepts which were learnt in previous classes as well. It aims to provide board conducted classes at the end of each academic year so that students grasp the topics effectively.

Term I and II CBSE Class 11 Biology Syllabus Course Structure 2021-22

Units	Term – I	Marks
I	Diversity of Living Organisms: Chapter – 1, 2, 3 and 4	15
II	Structural Organization in Plants and Animals: Chapter – 5 and 7	08
III	Cell: Structure and Function: Chapter – 8 and 9	12
Units	Term – II	Marks
IV	Cell: Structure and Function: Chapter – 10	05
V	Plant Physiology: Chapter – 13, 14 and 15	12
VI	Human Physiology: Chapter –17, 18, 19, 20, 21 and 22	18
	Total Theory (Term – I and Term – II)	70
	Practicals Term – I	15
	Practicals Term – II	15
	Total	100

How to utilise Class 11 Biology NCERT Solutions for Board and Competitive exams?

Biology is a subject that tells us all about the natural world. Just like the other disciplines of science, it tries to explain the various phenomenon, events, or organisms with the help of observation, experimentation and documentation. Here are a few tips you need to learn to study biology.

Drawing

Diagrams are a prominent part of NCERT Class 11 Biology syllabus. In the exam, though, you will not have much time to draw neatly or clearly, and this, in turn, might prevent you from getting the marks you need to score well in the exam. Therefore, practise the relevant diagrams with some aspects such as shading and texturing beforehand. Doing this will make you stand out from your fellow students. Now, this might take some time to develop and get good at, but the reward is worth it.

Breaking down Information

The sheer magnitude of information might make it hard for you to remember everything. That is why you need to develop a technique called information chunking, where the information is broken down into small chunks, and this makes it easier for the student to process the information. This is very effective because the cognitive load is reduced, and this, in turn, slows down mental fatigue. How you split the information is entirely dependent on you and your abilities.

Note Taking

Everyone already knows this, but not everyone implements it. This technique is underrated but incredibly helpful from an examination perspective. Whenever you are attending a lecture, make sure you note down the crucial points that the teacher says. This process stimulates your thinking, and you can recall information more easily. Furthermore, this is an essential tool to use when you revise for your exam. Since you prepare these notes, you will find it easier to comprehend and recall the information than any other textbook.

For more resources like important questions, mock tests, sample papers, you can register at BYJU’S or download our app. India’s largest K-12 learning app has the country’s best teachers. Find NCERT Solutions, notes, question papers, and worksheets for various other subjects like Mathematics, Physics, Chemistry. We provide resources to prepare for competitive exams as well.

Frequently Asked Questions on NCERT Solutions for Class 11 Biology

How can I prepare for the Class 11 Biology exam using the NCERT Solutions?

From the beginning, students must understand the chapters thoroughly and work on them to score well in the Class 11 exam. The NCERT Solutions from BYJU’S are designed by expert faculty having vast experience in the respective subject. Each and every solution contains pictorial representation to help students understand the concepts effectively. By using these solutions on a regular basis, students will be able to grasp the complex concepts which are important from the exam point of view.

Which site is the best for NCERT Solutions for Class 11 Biology PDF?

We at BYJU’S provide solutions for all the questions present in the NCERT Textbook. Students are advised to refer to these solutions to obtain a clear idea about the topics which require more practice. The solutions are framed by the teachers with utmost care by keeping in mind the understanding abilities of Class 11 students. By referring to these solutions, students can improve their analytical and logical thinking skills which are important to score well in the Class 11 exams.

How can I use the NCERT Solutions for Class 11 Biology for board exams and other competitive exam preparation?

Biology is a subject which explains us about the natural world. It helps us to understand the various events, phenomena and organisms using experimentation, observation and documentation. The NCERT Solutions from BYJU’S provides students with a strong foundation of basic concepts which could be continued in higher levels of education as well. The solutions explain each and every topic in a simple language which makes learning easier for the students.

Can I revise the entire syllabus using the NCERT Solutions for Class 11 Biology?

In the Class 11 Biology, there are about 22 chapters covering the important concepts from the exam perspective. To study all these concepts, students are advised to refer to the NCERT Solutions for Class 11 Biology PDF available on BYJU’S. Both chapter wise and exercise wise solutions can be downloaded and used by the students without any time constraints. These solutions are developed with the aim of helping students to ace the exam without fear.

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NCERT Solutions for Class 11 Biology