CBSE EXAMINATION PAPER-2026
SCIENCE
(Solved)
General Instructions :
Read the following instructions carefully and follow them :
- This question paper contains 44 questions. All questions are compulsory.
- This question paper is divided into 5 sections.
- Section A – questions number 1 to 2 are case based questions
- Section B – questions number 3 to 22 are multiple choice questions
- Section C – questions number 23 to 30 are very short answer
- Section D – questions number 31 to 38 are short answer
- Section E – questions number 39 to 44 are long answer
- There is no overall choice given in the question paper. However, an internal choice has been provided in few questions.
- Use of calculator is NOT allowed.
Section A
(1) Why is hydrotropism essential for plants ?
[1 Mark](2) What role does auxin play in the growth of plants ?
[1 Mark](3) Differentiate between movement shown by the sensitive plant and tropic movement by plants (Two points).
[1 Mark](4) How does movement of roots differ from that of shoots in response to gravity and light ?
[1 Mark]
(1) What kind of image of a star is seen by the observer in the eye-piece ?
[1 Mark](2) What kind of mirror is used in this reflecting telescope ?
[1 Mark](3) Explain with the reason, what kind of optical device (type of lens or mirror) is used at the eye-piece.
[2 Marks]Section B
Observe the given figure and select the statement that correctly states how these fungi obtain nutrition.
If the part ‘P’ of the flower is removed, which of the following processes will not take place ?
Given below are some of the statements regarding our environment :
(i) Change in our life-styles have resulted in greater amounts of waste material generation.
(ii) Changes in attitude have resulted in use of more disposable things.
(iii) Changes in packaging has resulted in much of our waste becoming non-biodegradable.
(iv) Organic farming
Which amongst these is not leading to any damage of environment ?
Identify the traits that cannot be transmitted from parents to the offsprings : (i) Swimming technique (ii) Blood group (iii) Eye colour (iv) Dancing skills
Two pea plants, one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds were crossed with each other which produced F₁ progeny that have only round yellow (RrYy) seeds. When F₁ plants are self-pollinated, the F₂ progeny will have which new combination of characters, as compared to the parents : (i) Round, yellow (ii) Round, green (iii) Wrinkled, yellow (iv) Wrinkled, green Correct options are :
In human beings the oxygen rich blood is pumped out to the body by :
Two statements : Assertion (A) and Reason(R). Answer these questions selecting the appropriate option from (A), (B), (C) and (D) given below :
Assertion (A) : Variations are not often seen in off-springs produced by asexual reproduction.
Reason (R) : DNA molecule generated by replication is not similar to the original DNA.
Two statements : Assertion (A) and Reason (R). Answer these questions selecting the appropriate option from (A), (B), (C) and (D) given below :
Assertion (A) : Highest percentage of pesticides is found in tertiary consumers in a food chain.
Reason (R) : Chemicals / pesticides get accumulated progressively at each trophic level.
The volume ratio of hydrogen and oxygen gases liberated during electrolysis of water is
An aqueous solution turns red litmus blue. Excess addition of which of the following solution would reverse the change ?
Which one of the following metals does not react with cold water ?
Alloys are homogeneous mixture of metal with a metal or non-metal. Which among the following alloys contain non-metal as one of its constituents ?
The vision defect which arises due to gradual weakening of the ciliary muscles and diminishing flexibility of eye lens is :
Two statements are given – one labelled as Assertion (A) and other labelled as Reason (R). Select the correct answer to this question from the codes (A), (B), (C) & (D) as given below :
Assertion (A) : With the help of compass, magnetic field lines can be traced outside the bar magnet. Reason (R) : The north pole of a compass needle always points towards the south pole of the magnet when brought close to it.
C₆H₁₂O₆(aq) + 6O₂(g) → 6CO₂(g) + 6H₂O₍ₗ₎ . The above reaction is an example of -
Section C
“Transpiration in plants is a necessary evil.” Comment on the statement giving two reasons.
Explain why food chains generally consist of three or four steps.
Varun is diabetic. His latest ultrasound reports showed a blockage in his pancreatic duct. How will this affect the dual functioning of the pancreas ?
Sunil unconsciously touched the hot iron rod and immediately withdrew his hand. Which type of action is involved ? Also define this action. Draw a flow chart to show the path followed for this action.
(a) A compound ‘A’ is used in soda-lime fire-extinguisher and decomposes on heating to form compound ‘B’. Compound ‘B’ is used for removing permanent hardness of water. Identify ‘A’ and ‘B’.
(b) Write chemical formula of Plaster of Paris. At what temperature gypsum is heated to obtain Plaster of Paris ?
A fuse in electric circuit is rated 4 A. Can it be used with an electric heater of rating 2 kW, 200 V ? Explain your answer.
How is an electromagnet made ? Write any two ways by which the strength of electromagnet can be increased.
(a) Define volt, the unit of potential difference.
(b) Calculate the work done required to move an electron between two points A and B located at a potential difference of 100 V in an electric field.
Section D
Give reasons for the following :
(a) Adrenal gland is known as the stress gland of the body.
(b) Prenatal sex determination is banned in India.
(c) Vegetative propagation is advantageous in some plants.
Study the given table and answer the following questions :
(a) Depict the information given in the table in the form of a cross.
(b) Deduce the F2 phenotypic ratio/F2 ratio showing external look as well as genotypic /genetic makeup, ratio.
Account for the following :
(a) White silver chloride turns grey when exposed to sunlight.
(b) Lead (II) nitrate on heating releases brown fumes.
(c) Bags of oil and fat containing food items are flushed with nitrogen gas.
(i) Which method will be used to convert each of them to their respective metal oxides ?
(a) Carbonate ore (b) Sulphide ore
(ii) Write a chemical reaction to illustrate the use of aluminium for joining cracked railway tracks.
(iii) During extraction of metals, electrolytic refining is used to obtain pure metals. Which material will be used as anode and cathode for the refining of copper metal by this process ?
(i) Write all the reactions involved in the extraction of Zn from ZnS.
(ii) Hydrogen gas is not evolved when most of the metals react with nitric acid. Give reason.
(a) Observe the given ray diagram and compare :
(i) the speed of light in medium A and the speed of light in medium B.
(ii) the optical densities of medium B and medium C.
(b) Draw a ray diagram for refraction where the optical density of medium ‘A’ becomes equal to the optical density of medium ‘C’ and optical density of medium ‘B’ is greater than the optical density of medium ‘A’ and medium ‘C’.
Explain the phenomenon of rainbow formation in the sky. Draw the labelled ray diagram in support of your explanation.
On the basis of the given circuit arrangement, answer the following questions :
(a) What happens to the rod AB when the key K is closed and why ?
(b) Name and state the rule that determines this behaviour of the rod AB in the above situation.
Section E
(a) Draw a labelled diagram showing open and closed stomatal pore.
(b) List the main events that occur during the process of photosynthesis.
(c) Write a balanced chemical equation showing photo-synthesis in plants.
(a) Draw a well-labelled diagram of nephron and label atleast 4 of its parts.
(b) Write the role of capillary cluster inside Bowman’s capsule.
(c) What is meant by selective reabsorption ?
(i) Carbon cannot form C⁴⁺ cation and C⁴⁻ anion. Explain.
(ii) Define homologous series of carbon compounds. Why are the melting and boiling points of C₄H₁₀ higher than C₃H₈ or C₂H₆ ?
(iii) What happens when ethanol is heated with acidified potassium dichromate ?
(i) How would you name the following :
II. CH₃ – C ≡ CH
(ii) When ethanol reacts with ethanoic acid in the presence of conc. H₂SO₄, a substance with sweet smell is produced. Answer the following :
I. State the class of compounds to which the sweet smelling compounds belong.
II. Write the chemical equation for the reaction.
(iii) Why soaps do not produce foam with hard water ?
(i) The given electric circuit is a part of an electrical device. Use the information given in the electric circuit diagram to calculate :
(I) Potential difference across the ends of resistor R₂ .
(II) Value of resistor R₂ .
(III) Value of resistor R₁ .
(ii) Write the factors on which resistance of a conductor depends and derive the formula for resistance of a given conductor.
(i) How much electric current will an electric iron draw from 220 V source if the resistance of its heating element when hot, is 55Ω ? Calculate the power consumed by the electric iron when it is operated at 220 V.
(ii) In a house, 3 bulbs of 100 watt each, are lit for 5 hours daily and an electric heater of 1.0 kW is used for half an hour daily. Calculate the total energy consumed in a month of 30 days and its cost at the rate of Rs 3.60 per kWh.
(iii) With reason explain, why are alloys commonly used to make elements of electrical heating devices.
Other Years — Science