Science 31/4/1 2025-2026 English Medium Class 10 Question Paper Solution

Observe the given figure and select the statement that correctly states how these fungi obtain nutrition.

By eating the bread on which it is growing.

By using nutrients from the bread to prepare their own food.

By breaking down the nutrients of bread outside the body and then absorbing them.

By allowing other organisms to grow on the bread and then consuming them.

If the part ‘P’ of the flower is removed, which of the following processes will not take place?

Formation of pollens

Formation of flower

Formation of fruit

Formation of seed

Given below are some of the statements regarding our environment:

1. Change in our life-styles have resulted in greater amounts of waste material generation.
2. Changes in attitude have resulted in use of more disposable things.
3. Changes in packaging has resulted in much of our waste becoming non-biodegradable.
4. Organic farming.

Which amongst these is not leading to any damage of environment?

(i), (ii), (iii)

(iv)

(i) and (iii)

(ii) and (iv)

Identify the traits that cannot be transmitted from parents to the offsprings:

1. Swimming technique
2. Blood group
3. Eye colour
4. Dancing skills

(i) and (ii)

(i) and (iv)

(iii) and (iv)

(ii) and (iii)

Following are the statements about the different parts of the brain. Select the correct statements.

1. The thinking part of the brain is the forebrain.
2. Centres for smell, hearing, memory, sight are located in forebrain.
3. Salivation, vomiting, blood pressure are controlled by medulla in the hind brain.
4. Cerebellum does not control the posture and balance of the body.

(i), (ii) and (iii)

(ii), (iii) and (iv)

(i), (ii) and (iv)

(i), (iii) and (iv)

In human beings the oxygen rich blood is pumped out to the body by ______.

contraction of right atrium.

relaxation of left ventricle.

contraction of right ventricle.

contraction of left ventricle.

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.

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).

Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).

Assertion (A) is true, but Reason (R) is false.

Assertion (A) is false, but Reason (R) is true.

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.

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).

Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).

Assertion (A) is true, but Reason (R) is false.

Assertion (A) is false, but Reason (R) is true.

“Transpiration in plants is a necessary evil.” Comment on the statement giving two reasons.

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.

Give reasons for the following:

Adrenal gland is known as the stress gland of the body.

Give reasons for the following:

Prenatal sex determination is banned in India.

Give reasons for the following:

Vegetative propagation is advantageous in some plants.

Study the given table and answer the following questions:

1. Depict the information given in the table in the form of a cross.
2. Deduce the F₂ phenotypic ratio/F₂ ratio showing external look aв well as genotypic/genetic makeup, ratio.

(a) Why is hydrotropism essential for plants?

(b) What role does auxin play in the growth of plants?

(c) Differentiate between movement shown by the sensitive plant and tropic movement by plants (Two points).

OR

(c) How does movement of roots differ from that of shoots in response to gravity and light?

Draw a labelled diagram showing open stomatal pore.

Draw a labelled diagram showing closed stomatal pore.

Mention the major events during photosynthesis.

Write the overall chemical equation for photosynthesis.

Draw and label the diagram.

Nephron

Write the role of capillary cluster inside Bowman’s capsule.

What is meant by selective reabsorption?

The volume ratio of hydrogen and oxygen gases liberated during electrolysis of water is ______.

1 : 1

2 : 1

4 : 1

1 : 2

\[\ce{C6H12O6_{(aq)} + 6O2_{(g)} -> 6CO2_{(g)} + 6H2O_{(l)}}\]

The above reaction is an example of ______.

Displacement Reaction

Endothermic Reaction

Exothermic Reaction

Neutralisation Reaction

An aqueous solution turns red litmus blue. Excess addition of which of the following solution would reverse the change?

Sodium hydroxide

Hydrochloric acid

Baking soda

Slaked lime

While washing dirty clothes by soap, micelles are formed. Select the correct statement about micelles.

The hydrophobic tail of the soap molecule is in the interior of the cluster, whereas hydrophilic end is on the surface of the cluster.

The hydrophobic tail is on the surface of the cluster, whereas hydrophilic end is in the interior of cluster.

Both hydrophobic tail and hydrophilic end are in the interior of the cluster.

Both hydrophobic tail and hydrophilic end are on the surface of the cluster.

Which one of the following metals does not react with cold water?

Sodium

Potassium

Calcium

Magnesium

Alloys are homogeneous mixtures of a metal with a metal or non-metal. Which among the following alloys contain non-metal as one of its constituents?

Brass

Bronze

Amalgam

Steel

How will you protect yourself from the heat generated while diluting a concentrated acid?

By adding acid to water with constant stirring.

By adding water to acid with constant stirring.

By adding water to acid followed by base.

By adding base to acid with constant stirring.

Assertion (A): Pure ethanoic acid is also known as glacial acetic acid.

Reason (R): Pure ethanoic acid often freezes during winter due to its low melting point of 290 K.

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).

Both Assertion (A) and Reason (R) are true, but Renson (R) is not the correct explanation of the Assertion (A).

Assertion (A) is true, but Reason (R) is false.

Assertion (A) is false, but Reason (R) is true.

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’.

Write the chemical formula of Plaster of Paris.

At what temperature gypsum is heated to obtain Plaster of Paris?

Account for the following:

White silver chloride turns grey when exposed to sunlight.

Account for the following:

Lead (II) nitrate on heating releases brown fumes.

Account for the following:

Bags of oil and fat containing food items are flushed with nitrogen gas.

Which method will be used to convert it to its respective metal oxide?

Carbonate ore

Which method will be used to convert it to its respective metal oxide?

Sulphide ore

Write a chemical equation to illustrate the use of aluminium for joining cracked railway lines.

Name the anode and the cathode used in the electrolytic refining of impure copper metal.

Write all the reactions involved in the extraction of Zn from ZnS.

Hydrogen gas is not evolved when most of the metals react with nitric acid. Give reason.