Which of the following is not a role of decomposers in the ecosystem?
- ANatural replenishment of soil.
- BEnrichment of oxygen in atmosphere.
- CWaste decomposition.
- DBreak-down of dead remains.
Question types
MODEL PAPER 2025 question types
45 questions across 6 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
45
Questions
6
Question groups
5
Question types
01
M.C.Q
16 Q→02Assertion - Reasoning (1 Marks)
4 Q→03[2 Mark Questions]
8 Q→04[3 Mark Questions]
8 Q→05[5 marks Questions]
6 Q→06case /data -based (4 Marks)
3 Q→Sample Questions
MODEL PAPER 2025 questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Identify the incorrect statement
'The energy available to the producers is maximum' because:
'The energy available to the producers is maximum' because:
- AIt is the first trophic level which absorbs1% of light energy directly from the source.
- BIt utilizes the most of the chemical energy for its own respiration, growth, reproduction, movement etc.
- ✓It utilizes 10% of light energy and transfers the rest to the next trophic level.
- DIt transfers only 10% of light energy to the next trophic level.
Answer: C.
View full solution →
Choose the correct option for the colour of rays for A and B.
| Colour of Ray A | Colour of Ray B | |
| A. | Blue | Red |
| B. | Green | Yellow |
| C. | Red | Violet |
| D. | Violet | Indigo |
In the following cases, a ray is incident on a concave mirror. In which case is the angle of incidence equal to zero?
- AA ray parallel to the principal axis.
- ✓A ray passing through the centre of curvature and incident obliquely.
- CA ray passing through the principal focus and incident obliquely.
- DA ray incident obliquely to the principal axis, at the pole of the mirror.
Answer: B.
View full solution →In snails individuals can begin life as male and depending on environmental conditions they can become female as they grow. This is because
- Amale snails have dominant genetic makeup.
- Bfemale snails have dominant genetic makeup
- Cexpression of sex chromosomes can change in a snail's life time.
- Dsex is not genetically determined in snails
Assertion (A): On adding dil. HCI to a test tube containing a substance 'X', a colourless gas is produced which gives a pop sound when a burning match stick is brought near it.
Reason (R): In this reaction metal 'X' is displaced by Hydrogen
Reason (R): In this reaction metal 'X' is displaced by Hydrogen
Assertion (A): On adding dil. HCI to a test tube containing a substance 'X', a colourless gas is produced which gives a pop sound when a burning match stick is brought near it.
Reason (R): In this reaction metal 'X' is displaced by Hydrogen.
Reason (R): In this reaction metal 'X' is displaced by Hydrogen.
Assertion (A): A convex mirror always forms an image behind it and the image formed is virtual.
Reason (R): According to the sign convention, the focal length of a convex mirror is positive.
Reason (R): According to the sign convention, the focal length of a convex mirror is positive.
Assertion (A): If the lions are removed from a food chain it will not affect the food chain, however if the plants are removed from a food chain it will disturb the ecosystem.
Reason (R): Plants are producers who can make food using sunlight, while lions are consumers.
Reason (R): Plants are producers who can make food using sunlight, while lions are consumers.
What impact will the process shown in the image have on Humans if they occupy the last trophic level? Explain.
The above figure shows two resistors X and Y connected in series to a battery. The power dissipated for this combination is P1. When these resistors are connected in parallel to the same battery then the power dissipated is given by $P_2$ Find out the ratio $\frac{P_1}{P_2}$.
The electric circuit (above figure) in a clothes dryer contains two heaters X and Y in parallel. The above figure shows the circuit connected to a 230 V power supply. When both switches are closed, the current in X is 3.5 A.
Analyse the circuit given above and answer the following questions.
(i) Calculate the power developed in heater X.
(ii) If the resistance of X is double that of Y calculate the current in heater Y
The above figure shows the formation of an image by a lens shown by a thick line.
Analyse the figure and answer the following questions.
A. What is the type of lens used?
B. What is the nature of the image?
C. If the image is formed at a distance of 30 cm from the lens and the image is twice the size of the object, then where is the object placed?
Explain the role of the following enzymes in the process of digestion of food in humans:(i) Salivary amylase
(ii) Pepsin
(iii) Trypsin
(iv) Lipase.
(ii) Pepsin
(iii) Trypsin
(iv) Lipase.
Mona was doing an experiment with a magnetic compass and a straight current-carrying wire. She observed that as she moved the compass away from the current-carrying wire, the deflection of the compass needle reduced.
A. Explain why the deflection of the compass needle reduced as Mona moved away the compass needle from the current carrying wire.
B. Mention one thing that could have changed in the circuit of the wire that could increase the deflection of the needle.
C. Explain with reason what will be the direction of the magnetic field associated with the wire for the case described by the above figure.
$A. $State the relationship between the resistance $R$ of a wire to its length I and cross sectional area $A.$ Use the mathematical symbols to arrive at the final formula.
$B.$ Using the formula define the resistivity of a material.
View full solution →$B.$ Using the formula define the resistivity of a material.
A. What is the fundamental difference between hypermetropia and myopia 3 in terms of the optical experience of a person?
B. The diagram below shows a special case of an eye defect.
(i) What is the defect that is shown in the figure?
(ii) State one cause for such a defect?
(iii) Explain with reason if a concave lens can be used to correct the defect.
B. The diagram below shows a special case of an eye defect.
(i) What is the defect that is shown in the figure?
(ii) State one cause for such a defect?
(iii) Explain with reason if a concave lens can be used to correct the defect.
A. In a family of four individuals, the father possessed long ears and the mother possessed short ears. If the parents had pure dominant and recessive traits respectively, then calculate the ratio of genetic makeup of F2 generation. Show a suitable cross.(2)
B. If father had short ears and the mother had long ears, explain what effect it will have on the ratio of genetic makeup in F2 generation. (1)
B. If father had short ears and the mother had long ears, explain what effect it will have on the ratio of genetic makeup in F2 generation. (1)
Water is used by the leaves of the plants for photosynthesis but rather than watering the leaves, we water the plant through the soil. How does this water reach the leaves of the plant?
As shown in the figure above $A$ and $B$ are two lamps. Lamp $A$ is rated at $12\ V, 24\ W.$ Lamp $B$ is rated at $6.0 \ V.$ When lamp $B$ operates at its rated voltage, the current in it is $3.0 \ A$. The values of $R_1$ and $R_2$ are chosen so that both lamps operate at their rated voltages.
Based on the information given, answer the following.
$(i)$ Calculate the current in Lamp $A$.
$(ii)$ State and give reason for the reading of the Voltmeter.
$(iii)$ Calculate the resistance of $R_2$.
$(iv)$ Find the value of the resistance $R_1$.
The above circuit is a part of an electrical device. Use the information given in the question to calculate the following.
$(i)$ Potential Difference across $R_2.$
$(ii)$ Value of the resistance $R_2.$
$(iii)$ Value of resistance $R_1$
The image below shows a developing fetus in the mother's womb. The developing fetus is connected to the placenta by means of umbilical cord. The Umbilical vein and artery run inside the umbilical cord.
(i) Name two substance that moves through the blood vessels. (1)
(ii) If the placenta has less villi how will it affect the baby's growth? (1)
(iii) Name the region where the embryo develops inside the female body. Explain how this region is adapted for nourishing the baby. (1)
(iv) Some of the fetal cells fall off into the amniotic fluid and can be collected by careful procedure. The cells were screened and found to contain XY chromosome. (2)
(a) What is the sex of the foetus?
(b) How is this prenatal sex determination misused?
(i) Name two substance that moves through the blood vessels. (1)
(ii) If the placenta has less villi how will it affect the baby's growth? (1)
(iii) Name the region where the embryo develops inside the female body. Explain how this region is adapted for nourishing the baby. (1)
(iv) Some of the fetal cells fall off into the amniotic fluid and can be collected by careful procedure. The cells were screened and found to contain XY chromosome. (2)
(a) What is the sex of the foetus?
(b) How is this prenatal sex determination misused?
The image below shows a banana plant which is growing with the help of suckers. These suckers are small plant stem outgrowths which can be separated from the main plant and planted separately and they will grow into a new plant subsequently.
(i) Give the name and type of reproduction that is shown in the image above. (1)
(ii) List two advantages the farmer will have on using the type of reproduction mentioned above. (2)
(iii) The above plant produces male flowers. Explain how this plant will be involved in the process of pollination. (1)
(iv) Why is the offspring of this banana plant not absolutely identical to its parent plant? (1)
(i) Give the name and type of reproduction that is shown in the image above. (1)
(ii) List two advantages the farmer will have on using the type of reproduction mentioned above. (2)
(iii) The above plant produces male flowers. Explain how this plant will be involved in the process of pollination. (1)
(iv) Why is the offspring of this banana plant not absolutely identical to its parent plant? (1)
$(i) '\ A\ '\ '\ B\ '$ are sodium salts of long$-$chain carboxylic acid and long chain Sulphonic acid respectively. Which one of $A$ or $B$ will you prefer as a cleansing agent while using underground water $($hand pump water$)$?
Give the reason for your answer.
$(ii)$ Elaborate on the process of cleansing action. Illustrate micelle with the help of labelled diagram.
$(iii)$ Write the chemical equation of the preparation of soap from an ester
$CH_3COOCH_3$. What is the name of this process?
View full solution →Give the reason for your answer.
$(ii)$ Elaborate on the process of cleansing action. Illustrate micelle with the help of labelled diagram.
$(iii)$ Write the chemical equation of the preparation of soap from an ester
$CH_3COOCH_3$. What is the name of this process?
The above image is that of a reflecting telescope. Reflecting telescopes revolutionised our ways of looking into the sky. They employ mirrors to gather and focus light, rather than relying solely on lenses as in their refracting counterparts. These telescopes utilise precisely shaped and polished mirrors to capture incoming light and reflect it to a focal point, where it forms an image for observation.
A. What kind of image of the star is seen by the observer at the eyepiece?
B. What kind of mirror is used in this reflecting telescope?
Attempt either subpart C or D.
C. Explain with reason what kind of optical device (type of lens or mirror) that is used at the eyepiece.
OR
D. What is the role of the plane mirror in the telescope?
In order to help them understand the movements in the plants, answer the following questions:
Attempt either subpart A or B.
A. What causes the bending of shoots in the plants as shown in figure A?
OR
B. What causes the folding of the leaves in 'Touch me not' plant as shown
in figure B? (2)
C. Compare the movement of growth of the pollen tube towards ovule with the movements shown in part A of the above figure. (1)
D. Compare the movement shown in figure B with the movement of body parts in the animals. (1)
A. Derive the names of A, Y, Z, M, P & R
Attempt either subpart B or C.
B. Improvise an activity to test Z.
OR
C. Name the process in which compounds X, Y & Z are formed from A. Justify your response.
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