CBSE 10 Science Answer Key 2026 and Question Papers, Download PDF All SETs

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The CBSE Class 10 Science Paper 2026 exam was conducted today, Feb 25, 2026. The exam lasted for 3 hours, conducted from 10:30 am to 1:30 pm, with an additional 15 minutes given for reading the question paper.

Here we are providing a detailed analysis of student responses, expert opinions, and the difficulty level of the paper including expected good scores, time-consuming section, and longest question.

We have shared the CBSE Class 10 Science Question Paper 2026 PDF and answer key to help students check their answers and evaluate their performance —a direct link to download the CBSE 10th Science Question Paper 2026 to be available on this page.

CBSE Class 10 Science Question Paper 2026 - Download PDF

The CBSE Class 10 Science question paper 2026 for all sets is now available for download. Students can check the questions and compare their answers.

👉 CBSE Class 10 Science Question Paper 2026 Set 1

👉 CBSE Class 10 Science Question Paper 2026 Set 2

👉 CBSE Class 10 Science Question Paper 2026 Set 3

CBSE Class 10 Science Exam 2026: Paper Analysis

As per expert analysis, the CBSE Class 10 Science paper was set exactly according to the sample paper and blueprint issued by CBSE, with proper section-wise division of marks. The questions were completely NCERT-based, and there were no unexpected surprises.

A few questions were HOTS and application-based, making the paper balanced and concept-oriented. Overall, it was a well-structured paper, and students were satisfied and happy with their performance.

CBSE Class 10 Science Exam 2026: Subject-Wise Analysis

The paper was well-balanced across Physics, Chemistry, and Biology. Here is a quick breakdown of how each section performed:

Subject	Difficulty Level	Key Highlights
Biology	Easy	Directly from NCERT; one tricky question on Reproduction.
Chemistry	Easy	Student-friendly; focus on Metallurgy and Carbon compounds.
Physics	Moderate	Concept-heavy; direct numericals on Light and Electricity.

Student Feedback: How Was the Paper?

Most students who walked out of the exam hall described the paper as easy to moderate. The general consensus is that the questions were clear and followed the NCERT textbook closely.

While a few application-based questions required a bit of extra thought, students felt the paper was fair. If you revised your syllabus and practiced the sample papers, you likely found this exam quite manageable.

Difficulty Level and Paper Pattern

Overall, the CBSE Class 10 Science Exam 2026 was successful and balanced. Experts noted that it stayed true to the NCERT pattern. While Physics included some conceptual questions on Magnetism, the numericals were straightforward, ensuring students could score well if they knew their formulas.

Marking Scheme and Weightage

The Science paper carries a total of 100 marks, divided into two main parts:

Theory Exam: 80 Marks (includes 12 marks for practical-based theory).
Internal Assessment: 20 Marks.

CBSE Class 10 Science Answer Key 2026 (31/5/2) - By Experts

SECTION - A (Biology)

Q. No	Correct Answer	Explanation
1	(C) Uterus	Implantation of the fertilized egg (embryo) occurs in the lining of the uterus.
2	(D) Budding	Yeast reproduces asexually through the process of budding.
3	(C) Guard cells	Guard cells control the opening and closing of stomatal pores by changing shape.
4	(D)	This equation represents anaerobic respiration specifically in human muscle cells.
5	(B) DDT	DDT is a synthetic chemical that does not break down naturally in the environment.
6	(C) 44+XY	A human egg (22+X) fertilized by a Y-sperm (22+Y) results in a male zygote (44+XY).
7	(C) (i), (ii), (iii) and (iv)	All listed factors contribute to the excessive generation of waste.
8	(A)	Assertion & Reason are both true; muscles in the gut lining push food via peristalsis.
9	(A)	Assertion & Reason are both true; asexual reproduction creates clones with minor DNA errors.

Answer 10.

Part (A) Identification of Reflex Arc:

P: Receptor (Heat/Pain receptors in the skin)

Q: Sensory Neuron

R: Relay Neuron (located in the Spinal Cord)

S: Effector (Muscle in the arm)

Part (B) Plant Hormones:

(i) Promote cell division: Cytokinins

(ii) Inhibition of growth: Abscisic acid

(iii) Detection of light: Auxins (which facilitate phototropism)

(iv) Wilting of leaves: Abscisic acid

Answer 11. Double Circulation in Human Heart

Double circulation involves the blood passing through the heart twice during one complete cycle through the body:

Pulmonary Circulation: Deoxygenated blood is pumped from the right ventricle to the lungs, where it gets oxygenated and returns to the left atrium.
Systemic Circulation: Oxygenated blood is pumped from the left ventricle to all body parts (except lungs) and returns as deoxygenated blood to the right atrium.

Answer 12. Leaf Structure and Photosynthesis

(i) P: Chloroplast; Role: It contains chlorophyll, which traps solar energy necessary for the process of photosynthesis.

(ii) Balanced Equation for Photosynthesis:

Answer 13.

(a) Plastic Bags:

Harmful Effect: They are non-biodegradable and cause soil/water pollution or choke animals.

Alternatives: Jute bags, paper bags, or cloth bags.

(b) Chemicals in Food Chain:

How they reach us: Chemicals in soil/water are absorbed by plants (paddy), which are then consumed by humans.

Phenomenon: Biological Magnification (Biomagnification).

Answer 14. Control and Coordination (Adrenaline)

(a) Gland: Adrenal Gland.

Hormone: Adrenaline.

(b) Body Responses:

Increased heart rate: To supply more oxygen to the muscles.

Increased breathing rate: Due to contractions of the diaphragm and rib muscles.

Answer 15.

(a) Bowman’s Capsule: A cup-shaped structure at the upper end of a nephron that collects the initial filtrate from the glomerulus.

(b) Filtration vs. Excretion: Most of the 180 L of filtrate is reabsorbed by the nephron tubules, leaving only 1-2 L as urine.

(c) Excretion: The biological process of removing harmful metabolic wastes from the body. It is necessary to prevent the toxic buildup of substances like urea.

(c) Similarities (Lungs vs. Kidneys): Both are primary excretory organs and both possess a large surface area for exchange (alveoli in lungs, nephrons in kidneys).

Answer 16.

Part (A) Vegetative Propagation:

(i) Process: Vegetative Propagation.

(ii) Advantages: Plants can be grown faster than from seeds, and they are genetically identical to the parent.

(iii) Examples: Rose, Grapes, or Potato.

(iv) Regeneration Limitation: Complex organisms have specialized tissues and organs; they cannot regrow a whole body from a small piece because their cells are highly differentiated.

Part (B) Post-Fertilization Changes:

(i) Structure Changes:

(a) Zygote: Develops into the Embryo.

(b) Ovule: Develops into the Seed.

(d) Sepals: Usually wither and fall off.

(ii) Germination: The process by which a seed develops into a seedling under appropriate conditions of water, air, and temperature.

SECTION - B (Chemistry)

Q. No	Correct Answer	Explanation
17	(D) C₄H₈ and C₅H₁₂	C₄H₈ is an alkene (Butene), while C₅H₁₂ is an alkane (Pentane).
18	(D) Al₂O₃	Aluminum oxide is amphoteric; it reacts with both acids and bases.
19	(C) The amount of H₂ gas evolved is less.	Acetic acid is a weak acid compared to sulfuric acid, so the reaction is slower.
20	(B) 2:1	Water (H₂O) breaks into 2 parts Hydrogen and 1 part Oxygen by volume.
21	(D)	CH₃COONa is formed from a weak acid and strong base, making it Basic.
22	(C) C₃H₈	Propane (C₃H₈) is a saturated hydrocarbon (alkane) and does not undergo addition.
23	(D) Magnesium and Aluminium	Both are above Hydrogen in the reactivity series and can displace it from HCl.
24	(A)	Assertion & Reason are both true; the reaction of quicklime and water is highly exothermic.

SECTION - C (Physics)

Q. No	Correct Answer	Explanation
30	(A) Converging lens	A reduced eyeball causes hypermetropia, which is corrected using a convex (converging) lens.
31	(A) 20 cm	The focus (f) is 25 cm. For a virtual image in a convex lens, the object must be within the focal length (u<25 cm).
32	(D)	Assertion is False, Reason is True. In a strong external field, the needle aligns with that field, not necessarily Earth's North-South.

Students can use this key to quickly check the 1-mark objective questions that appeared in today's paper.

👉 CBSE Class 10 Study Materials

CBSE Class 10 study material includes latest syllabus, sample papers, NCERT books and solutions, previous year question papers, chapter-wise important questions, case study questions, assertion-reason questions, and competency-based questions — all updated as per the latest CBSE board exam pattern.

CBSE Class 10 Study Materials
CBSE Class 10 Full Study Material	CBSE Class 10 Sample Paper 2025-26
CBSE Class 10 Syllabus 2025-26	CBSE Class 10 Previous Year Question Papers
NCERT Solutions For Class 10	CBSE Class 10 Books
CBSE Class 10th Important Questions	CBSE Class 10th Case Study Questions
CBSE 10th Assertion & Reason Questions	CBSE Class 10th Most Repeated Questions
CBSE Class 10th Competency Based Questions