NCERT Solutions for Class 12 Biology Chapter 9

Mutual Induction: You might have studied induction earlier. Induction means the transfer of energy without any kind of physical contact. Mutual induction is a part...

Lens Maker's Formula: A transparent, refracting mediufm bound by two surfaces where at least one of the surfaces is curved is known as a lens....

Resistance, Resistivity and Conductivity: We deal with different kinds of materials. Some are metals, some are plastic, some are wood, and some are fluids. We...

Exponential and Logarithmic Functions:  Exponential functions are primarily employed to calculate population growth, compound interest, and radioactivity. Real-world applications such as bacterial growth/decay, population growth/decline,...

Applications of Differential Equations: A differential equation, also abbreviated as D.E., is an equation for the unknown functions of one or more variables. It relates...

Physical and geometrical interpretation of derivative: All functions with two variables can be represented by a graph on a two-dimensional plane, but we may not...

Algebraic Operations on Functions: We are familiar with the basic algebraic operations on numbers; we know how to do addition, subtraction, multiplication, and division of...

Pascal’s Law is a principle in fluid mechanics that tells us how pressure at various points inside a stationary liquid changes when the pressure at some...

Comparing Fractions: When it comes to fractions, we usually compare two or more fractions. In fact, we experience fractions in our day to day life....

LCM and HCF Relationship: The terms HCF stands for the highest common factor and LCM stands for the least common multiple. The HCF is the...

Angles of Elevation and Depression: When a person stands on the ground and looks up at an object, it creates an elevation between the line of...

Common Factors: Let us first define a factor before we can understand the concept of common factors. When a number is multiplied by another number...

Computation of Tax: The central government provides facilities to the public, such as construction and maintenance of roads, schools, hospitals, etc. To provide the facilities,...

Tissue System in Plants: Tissue is a collection of cells that perform a certain function. Plant cells, like those of other organisms, are organised into...

Regulation of Cardiac Activity: The cardiac cycle is a series of heart contractions that pressurise distinct chambers of the heart, forcing blood to flow in...

Dialysis: Have you ever wondered why we have one heart, one stomach, one liver, one brain but two kidneys? All of these organs perform vital...

Immune Disorders and Deficiency: Normally the immune system is in charge of maintaining and improving one's health by creating antibodies against any particles or infections...

Method of Mathematical Induction: Mathematical induction is a method of mathematical proof that is used to establish that any given statement is true for all...

More about Logarithms: There are certain processes in nature where the growth/decay of some quantity has very peculiar properties, for example, the rate of growth...

Axiomatic Approach to Probability: Probability is the certainty that an event will occur. It is a field of Mathematics dealing with numerical explanations of the...

Composition of functions: When we perform algebraic operations on functions, it results in a new function. In a similar way, we can create new functions...

Different types of linear programming problems: Linear programming, often known as linear optimisation, is a technique for finding the best solution to a mathematical problem...

Combinations: You may have noticed that people around you have specific combinations as their preferences. For example, my father likes to eat dosa with sambar, and...

Comparing Quantities: In everyday life, we come across many situations, quantities, activities, etc. Many times, we need to compare and measure these quantities. The comparison...

Cubic Polynomials: Polynomial is derived from the Greek word. "Poly" means many and "nomial" means terms, so together, we can call a polynomial as many...

Properties of Multiplication: Multiplication is one of the four basic operations in arithmetic. So, it is very crucial for young minds to grasp the concepts...

Thrust and Pressure: Have you ever noticed how our feet get trapped in loose sand, but a camel can effortlessly move on it? Why do we...