POLYCET 2026 Final Revision - Telangana Board Biology

Final Revision for POLYCET: Maths, Physics, Chemistry, Biology

Exam Instructions and Strategy

For the exam, arrive at the center at least one hour early to avoid last-minute stress. Carry your hall ticket, a passport-size photo, and an extra ID (Aadhaar card recommended). Bring both a black/blue pen and a pencil, as instructions may vary regarding which to use for bubbling answers. Only one option should be bubbled per question; multiple answers will not be awarded marks. There is no negative marking, so attempt all questions. For MPC (Maths, Physics, Chemistry) or BiPC (Biology, Physics, Chemistry) streams, attempt only…

Final Revision for POLYCET: Maths, Physics, Chemistry, Biology

Exam Instructions and Strategy

For the exam, arrive at the center at least one hour early to avoid last-minute stress. Carry your hall ticket, a passport-size photo, and an extra ID (Aadhaar card recommended). Bring both a black/blue pen and a pencil, as instructions may vary regarding which to use for bubbling answers. Only one option should be bubbled per question; multiple answers will not be awarded marks. There is no negative marking, so attempt all questions. For MPC (Maths, Physics, Chemistry) or BiPC (Biology, Physics, Chemistry) streams, attempt only the relevant sections as per your chosen field.

Key Mathematical Concepts and Formulas

Mathematical questions often focus on basic statistics, algebra, geometry, and arithmetic progressions. Important formulas and methods include:

• Range of Data: Highest value minus lowest value.
• Class Interval (Inclusive Method): Upper bound of one class minus lower bound of the previous class.
• Arithmetic Mean: Sum of observations divided by the number of observations.
• Mean of First n Natural Numbers: $(n+1)/2$
• Distance Between Two Points on x-axis: $|x_2 - x_1|$; on y-axis: $|y_2 - y_1|$
• Quadratic Equation Formation: If age-related, use $x$ for current age, $x-5$ for five years ago, $x+9$ for nine years later, and form equations accordingly.
• Distance Formula (General): $\sqrt{(x_2-x_1)^2 + (y_2-y_1)^2}$
• Area of Rhombus: $\frac{1}{2} \times d_1 \times d_2$ where $d_1$ and $d_2$ are diagonals.
• Angle Bisector Theorem: $\frac{AB}{AC} = \frac{BD}{DC}$
• Arithmetic Progression (AP):
  • $n$th term: $a_n = a + (n-1)d$
  • Common difference: $d = a_2 - a_1$
  • Sum of first $n$ terms: $S_n = \frac{n}{2}[2a + (n-1)d]$
• Quadratic Equation Roots: If $ax^2 + bx + c = 0$, roots are real if $b^2 - 4ac \geq 0$.
• Probability: Probability of an impossible event is $0$; for a single ace in a deck, $4/52 = 1/13$.

Geometry and Coordinate Geometry

Geometry questions include properties of triangles, circles, and polygons:

• Types of Triangles: Equilateral (all sides equal), Isosceles (two sides equal), Scalene (all sides different).
• Area of Triangle (Vertices): $\frac{1}{2}|x_1(y_2-y_3) + x_2(y_3-y_1) + x_3(y_1-y_2)|$
• Rhombus Area: As above, using diagonals.
• Circle Properties:
  • Distance between two parallel tangents: $2r$ (if radius is $r$).
  • All circles are similar.
  • Maximum number of parallel tangents to a circle: 2.
• Angle Bisector Theorem: Used to find unknown segments in triangles.

Trigonometry and Applications

Trigonometric concepts are tested through direct formula application and word problems:

• Basic Ratios: $\sin A = \frac{\text{opposite}}{\text{hypotenuse}}$
• Angle of Elevation/Depression: Use $\tan \theta = \frac{\text{opposite}}{\text{adjacent}}$
• Special Angles: $\tan 45^\circ = 1$, $\sin 30^\circ = 1/2$, etc.
• Rationalization: For expressions like $\frac{\sin \theta}{1+\cos \theta}$, multiply numerator and denominator by $1-\cos \theta$.

Algebraic Equations and Roots

• Nature of Roots: For $ax^2 + bx + c = 0$, if $b^2 - 4ac < 0$, there are no real roots.
• Sum and Product of Roots: For $ax^2 + bx + c = 0$, sum $= -b/a$, product $= c/a$.
• Quadratic Equations: Identify if an equation is quadratic by checking if the highest degree is 2.

Physics: Reflection, Refraction, and Lenses

• Speed of Light: $3 \times 10^8$ m/s.
• Reflection Laws:
  • Angle of incidence equals angle of reflection.
  • Incident ray, reflected ray, and normal lie in the same plane.
• Mirror Types:
  • Plane mirror: Image is virtual, erect, and same size as object.
  • Spherical mirrors: Concave (converging), Convex (diverging).
• Mirror Formula: $\frac{1}{v} + \frac{1}{u} = \frac{1}{f}$
• Magnification: $m = -v/u$ for mirrors; $m = v/u$ for lenses.
• Lens Formula: $\frac{1}{v} - \frac{1}{u} = \frac{1}{f}$
• Power of Lens: $P = 1/f$ (in meters), positive for convex, negative for concave.
• Refraction: Light bends towards normal when entering denser medium, away when entering rarer medium.
• Snell's Law: $\frac{\sin i}{\sin r} = \text{constant}$
• Refractive Index: $n = c/v$ (no units).
• Critical Angle and Total Internal Reflection: Occurs when light moves from denser to rarer medium at an angle greater than the critical angle.

Electricity and Magnetism

• Current: $I = Q/t$ (Q in coulombs, t in seconds).
• Ohm’s Law: $V = IR$
• Resistance: $R = \rho \frac{l}{A}$
• Series and Parallel:
  • Series: $R_{total} = R_1 + R_2 + ...$
  • Parallel: $\frac{1}{R_{total}} = \frac{1}{R_1} + \frac{1}{R_2} + ...$
• Power: $P = VI = I^2R = V^2/R$
• Domestic Circuits: Earthing wire is for safety; fuses protect against overcurrent.

Chemistry: Carbon and Its Compounds

• Valency of Carbon: 4; allows catenation and formation of single, double, triple bonds.
• Types of Hydrocarbons:
  • Alkanes: $C_nH_{2n+2}$ (single bonds)
  • Alkenes: $C_nH_{2n}$ (double bonds)
  • Alkynes: $C_nH_{2n-2}$ (triple bonds)
• Functional Groups:
  • Alcohol: $-OH$ (suffix: -ol)
  • Aldehyde: $-CHO$ (suffix: -al)
  • Ketone: $>C=O$ (suffix: -one)
  • Carboxylic Acid: $-COOH$ (suffix: -oic acid)
• Nomenclature:
  • Longest carbon chain is the parent.
  • Numbering gives lowest possible number to functional group.
  • Prefixes for substituents (e.g., chloro-, bromo-, methyl-).
• Isomerism: Same molecular formula, different structures.
• Homologous Series: Compounds with same functional group, differing by $-CH_2-$.

Biology: Key Processes and Structures

• Photosynthesis: Occurs in chloroplasts; oxygen is evolved (Hydrilla experiment).
• Digestive System Flow: Mouth → Esophagus → Stomach → Small Intestine → Large Intestine.
• Heart Chambers: Upper chambers are atria (auricles), lower are ventricles.
• Largest Artery: Aorta.
• Blood Clotting: Requires Vitamin K and platelets.
• Water Transport in Plants: Xylem (root pressure, transpiration pull).
• Excretory System: Kidneys filter blood, nephrons are functional units, urine output ~1.6–1.8 L/day.
• Nervous System:
  • Sensory neurons: Carry information to brain/spinal cord.
  • Motor neurons: Carry information from brain/spinal cord to effectors.
• Plant Hormones:
  • Auxin: Phototropism, cell elongation.
  • Cytokinin: Cell division.
  • Gibberellin: Growth.
  • Ethylene: Fruit ripening.
• Genetics:
  • Mendel’s experiments: 7 contrasting traits in pea plants.
  • Monohybrid ratio: 3:1; Dihybrid: 9:3:3:1.
  • Origin of Species: Book by Charles Darwin.
• Excretory Organs in Animals:
  • Humans: Kidneys.
  • Planaria: Flame cells.
  • Earthworm: Nephridia.
  • Insects: Malpighian tubules.

Common Pitfalls and Exam Tips

• Read each question carefully, especially for “not” or “except” type.
• For bubbling, mark only one answer per question.
• Attempt all questions as there is no negative marking.
• For nomenclature, always identify the longest chain and prioritize functional groups.
• For geometry, check if the question refers to x-axis or y-axis for distance.
• For trigonometry, rationalize denominators when required.
• For physics, always use correct sign conventions in mirror/lens formulas.
• For chemistry, remember the general formulas for alkanes, alkenes, alkynes, and functional group suffixes.
• For biology, memorize key processes, structures, and their functions as directly stated.

Table: Key Functional Groups and Suffixes

• Use this table for quick reference during nomenclature questions.