CBSE Sample Papers for Class 11 Biology 2025

Isomerism in Ethers: All those compounds that bear the same molecular formula but differ in chemical properties are known as isomers. Isomerism arises from the...

Isomerism in Amines: What is the structural difference between \({\rm{n}}\)-Butylamine and \(2\)-methylpropanamine? Both the compounds belong to the homologous amine series, but they differ in...

Introduction to Science and its Branch - Chemistry: Science, as a subject, has not only fascinated many in the past, but several have taken up...

Metalloids: As we know, the elements in the periodic table are arranged as \({\rm{s,p,d}}\) and \({\rm{f}}\) blocks depending upon the orbital on which the valence...

Infertility and Assisted Reproductive Technologies: Infertility is a serious reproductive issue. Couples who are struggling with infertility issues can opt for procedures to have their...

Senescence and Abscission: Do you know that plants have a fixed life span like all other living things, and they also grow old and die...

Universe and Origin of Solar System: How and when did the universe begin? Even after centuries of research, this fundamental question remains as intriguing as...

NCERT Solutions for Class 11 Physics Chapter 15: NCERT Solutions for Class 11 Physics Chapter 15 deals with Waves. Students in Class 11 must ensure...

Article Writing Format CBSE: An article is a piece of information that is published in order to influence or inform the general public. The format...

Bond Linking Monomers in Polymers: Every living thing is made up of various proteins, enzymes, certain peptide hormones, carbohydrates, nucleic acids, polyphenolics etc. are important...

Reflection at Plane Surfaces: When a ray of light is incident on a plane surface, it bounces off the object. This phenomenon is called reflection....

Nature of C-X Bond in Haloalkanes: Haloalkanes and haloarenes have a special bonding in them wherein the halogen atom, chlorine, bromine, iodine or fluorine is...

Method of intervals: Let's say the weather forecaster just said there is going to be a snowstorm of at least \(2\) but less than \(7\) inches of...

Respiratory Balance Sheet: The balance sheet is the written statement of money earned and paid. The balance sheet of any business gives the idea of...

Absorption and Action Spectrum: Did you know every living thing is bioluminescent? We cannot observe emitted lights as our eyes can only perceive visible light....

Genetic Recombination in Prokaryotes: Do you remember Dolly, the sheep! Dolly is not any fairy tale creature, but she was the first-ever cloned animal. Clones...

Aluminium Nitrate Formula: Aluminium Nitrate is a white crystalline salt of Aluminium and Nitric acid, where Aluminium \(\left( {{\text{Al}}} \right)\) is a metal and Nitrate...

Oxygen in Soil and Water: Oxygen is an element belonging to the \({\rm{16th\;}}\) group of the periodic table. We have studied all about its physical...

Ionic Equilibrium in Solution: A solution containing ions that are formed by dissolving ionic compounds in a solvent is known as an ionic solution. Common...

Atomic Mass and Composition of Nucleus: The nucleus of an atom is present in the central region of an atom where the bulk of the...

Behaviour of Real Gases: All the gases are examples of real gases. Although no ideal gas exists, real gases are known to show ideal behaviour...

Important Trends and Anomalous Properties of Boron: Group \({\text{III}}\,{\text{A}}\) or \({13^{{\text{th}}}}\) group of the periodic table comprises of six elements, namely Boron \(\left({\text{B}} \right),\) Aluminium...

Kinematics of Rotation: The motion associated with the sliding motion of an object along one or more of the three dimensions, i.e., \(x,\,y\), and \(z\),...

A Fraction between Two Fractions: A fraction is a small portion of a larger whole or collection. When an object or a whole is divided...

Some Experiments on Breathing and Respiration: Do you know that we lose water during exhalation? If yes, then can you prove it? During respiration, our...

Barium Hydroxide Formula: Did you know Baryta or Baryta water is chemically known as Barium hydroxide? It is white and granular and one of the...

Lactose Formula: Do you know what is common in milk, yoghurt, cheese, cottage cheese, beer, and whey powder? It is lactose. This article is about...