Class 6 Science: Sample Paper Solutions - 3 | Sample Papers For Class 6 PDF Download

Time: 3 hrs
Total Marks: 80

General Instructions:

• This question paper consists of 34 questions in total and all questions are compulsory.
• Questions 1-7 are multiple-choice questions and carry 1 mark each. Write the correct answer in your answer sheet.
• Questions 8-17 are very short answer questions and carry 2 marks each.
• Questions 18-28 are short answer questions and carry 3 marks each.
• Questions 29-34 are long answer questions and carry 5 marks each.

Section - A

Q1. Which of these is a characteristic feature of monocot plants? 
(a) Two cotyledons 
(b) Reticulate venation in leaves 
(c) Parallel venation in leaves 
(d) Taproot system 

Ans: (c)
Monocot plants have parallel venation in their leaves, where veins run parallel to each other, unlike dicots with reticulate venation.

Q2. What is the main function of a thermometer’s liquid? (1 Mark)
(a) To measure weight
(b) To expand with heat
(c) To conduct electricity
(d) To change color

Ans: (b)
 The liquid inside the thermometer expands when heated, and this expansion is used to measure temperature. The rise in liquid level correlates with the temperature. 

Q3. Which unit is used to measure length in the SI system? ( 1 Mark)
(a) Centimeter
(b) Meter
(c) Gram
(d) Second

Ans: (b)
The SI unit of length is metre. Its symbol is m.

Q4. What process involves water droplets forming on a cold surface? (1 Mark)
(a) Evaporation
(b) Condensation
(c) Precipitation
(d) Freezing

Ans: (b)
Condensation occurs when water vapor in the air cools and turns into liquid water on a cold surface, such as water droplets forming on the outside of a cold glass. 

Q5. Which method uses a sieve to separate larger particles? (1 Mark)
(a) Filtration
(b) Sieving
(c) Decantation
(d) Winnowing

Ans: (b)
Sieving separates substances based on their size. For example, a fine mesh is used to separate flour from bran. The process allows larger particles to stay behind while finer particles pass through. 

Ans: (b)
When water boils, it turns from a liquid to a gas (steam) as the temperature reaches 100°C at standard atmospheric pressure. This process is called evaporation or vaporization.

Q7. Which natural treasure supports wildlife habitats? (1 Mark)
(a) Desert
(b) Forest
(c) Mountain
(d) River

Ans: (b)
Forests provide shelter, food, and a safe environment for numerous species of wildlife. They play a crucial role in maintaining biodiversity by supporting various ecosystems.

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Section - B

Q8. Why do plants need stomata? (2 marks)

Ans:

• Stomata are tiny pores found on the surface of leaves.
• They help in the exchange of gases by allowing carbon dioxide to enter for photosynthesis and oxygen to exit as a by-product.
• Stomata also help in transpiration, where water vapour exits, helping regulate temperature and maintain water balance in plants.

Q9. What is the purpose of sieving flour? (2 marks)

Ans: Sieving flour removes impurities like bran, stones, or any coarse particles. It also aerates the flour, making it light and smooth. This process ensures that the flour is fine and ready for cooking or baking, giving a smoother texture to dishes like puris or cakes.

Q10. How does the Sun appear bigger than other stars? (2 marks)

Ans: The Sun appears bigger than other stars because it is much closer to Earth—about 150 million kilometers away—while other stars are much farther, making them appear smaller. Although some stars are physically larger, the Sun’s proximity to Earth makes it appear the largest in the sky.

Q11. What is the role of roots in seed germination? (2 marks)

Ans: Roots play a crucial role during seed germination by anchoring the seedling into the soil. They absorb water and nutrients from the soil, which is essential for the plant’s growth. Without roots, the seedling cannot grow and develop into a mature plant. Roots also help in stabilizing the plant.

Q12. Name two uses of solar energy. (2 marks)

Ans:

• Solar energy is used to generate electricity through solar panels, which convert sunlight into electrical energy.
• It is also used in solar cookers, where sunlight is used to cook food, making it an eco-friendly cooking method.

Q13. How does a froglet differ from a tadpole? (2 marks)

Ans: A froglet is an early-stage frog that has developed legs and is beginning to lose its tail. It starts living on land, unlike the tadpole, which is fully aquatic and has no legs. The tadpole is in its larval stage and primarily swims with its tail, whereas a froglet is transitioning into adulthood.

Q14. What is a reference point in measuring distance? (2 marks)

Ans: A reference point is a fixed location or object used to compare and measure the position or distance of another object. For example, when measuring how far you’ve travelled, a fixed object like a bus stand or tree can be used as a reference point to measure your distance from it.

Q15. Why does water evaporate faster in sunlight? (2 marks)

Ans: Sunlight provides energy in the form of heat, which increases the movement of water molecules. As the temperature rises, water molecules gain energy and escape into the air as vapor, causing faster evaporation. Water in direct sunlight evaporates quicker than in the shade due to the added heat.

Q16. Name two materials used as filters besides filter paper. (2 marks)

Ans:

• Cotton: Can be used as a filter to separate solid particles from liquids.
• Sand: Used in filtration processes, such as in water purification, to remove impurities.

Q17. What is the Milky Way Galaxy? (2 marks)

Ans: The Milky Way Galaxy is the galaxy that contains our Solar System. It is a vast collection of billions of stars, gas, and dust. From Earth, we see it as a faint band of light stretching across the night sky, and it is home to our Sun and other stars. It can be observed from dark, clear skies, like those in Ladakh.

Section - C

Q18. Explain the steps involved in the scientific method. (3 Marks)

Ans: The scientific method involves the following steps:

1. Observation: Noticing something interesting or puzzling in the environment.

2. Question: Asking questions based on the observation.

3. Hypothesis: Forming a possible explanation or answer to the question.

4. Experiment: Testing the hypothesis by conducting experiments or making further observations.

5. Analysis: Analyzing the results to determine if they support the hypothesis or not.

Q19. How does winnowing separate husk from grains? (3 marks)

Ans:

• Winnowing is a method used to separate lighter particles, like husk, from heavier grains.
• The mixture is tossed into the air, usually using a flat basket or tray, and the wind blows away the lighter husk.
• The heavier grains, due to their weight, fall back down to the ground, while the husk is carried away by the wind. This process is commonly used by farmers for separating grain from husk after threshing.

Q20. Why do some seeds need darkness to germinate? (3 marks)

Ans: Some seeds, such as those of Calendula and Zinnia, require darkness to germinate because light can prevent the seeds from sprouting properly. Light may interfere with the seed’s ability to break dormancy and begin its growth process. These seeds germinate better when covered with soil, which blocks light and creates the ideal dark conditions for sprouting. Other seeds, like those of beans, do not require darkness and can germinate in light.

Q21. Explain how a telescope helps in studying the sky. (3 marks)

Ans: A telescope helps astronomers study distant objects in the sky by collecting more light than the human eye can.

• This allows the telescope to magnify objects such as planets, stars, and galaxies, making them appear brighter and larger.
• Telescopes also help in observing finer details such as the craters on the Moon's surface. 
• By using telescopes, scientists can learn more about the universe, including the composition of distant celestial bodies, their movement, and their characteristics.

Q22. How does soil support plant growth? (3 marks)

Ans: Soil plays a vital role in supporting plant growth by providing several important resources:

• Anchoring the plant: Soil holds the roots of the plant firmly, giving it stability.
• Water and air: Soil contains spaces for water and air, both of which are essential for the roots to absorb and for respiration.
• Nutrients: Soil is rich in nutrients that are absorbed by plant roots for their growth and development. Decomposing plant material in the soil enriches it with these nutrients.

Q23. Why is handpicking useful in separating mixtures? (3 marks)

Ans: Handpicking is a simple method of separating mixtures based on visible differences.

• It is useful when the unwanted particles are large and easy to distinguish from the desired material.
• For example, handpicking is effective for removing stones from grains of rice or separating large pieces of waste from compost. This method is quick, efficient, and requires no special equipment.

Q24. How do shoots and roots respond to sunlight differently? (3 marks)

Ans: Shoots and roots respond to sunlight in opposite ways:

• Shoots: They grow towards the light (positive phototropism) to maximize photosynthesis, which is vital for plant growth.
• Roots: They grow downward, away from the light (negative phototropism), to anchor the plant and search for water and nutrients from the soil.
  
• This differential growth helps the plant thrive by ensuring proper nutrient absorption and efficient energy production.

Q25. What are fossil fuels, and why are they limited? (3 marks)

Ans: Fossil fuels are natural resources, such as coal, petroleum, and natural gas, that have formed over millions of years from the remains of ancient plants and animals.

• These fuels are limited because they take millions of years to form and are being consumed much faster than they can be replenished.
• As a result, they are considered non-renewable resources, and reliance on them poses environmental concerns, including air pollution and climate change.

Q26. How does a tadpole adapt to life in water? (3 marks)

Ans: A tadpole is adapted to life in water in several ways:

• Tail: It has a tail that helps it swim efficiently in the water.
• Gills: Tadpoles have gills that allow them to absorb oxygen from water, as they do not have lungs in the early stages of life.
  These adaptations help the tadpole survive and thrive in an aquatic environment before undergoing metamorphosis into an adult frog.

Q27. Why is the SI unit of length important? (3 marks)

Ans: 

• ​The SI unit of length, the meter, is important because it standardizes measurements across the world, ensuring consistency and accuracy.
• Using meters instead of varying units like feet or inches avoids confusion and enables clear communication.
• It is used universally in scientific research, engineering, and daily life to ensure that all measurements are comparable and precise.

Q28. How do forests contribute to biodiversity? (3 marks)

Ans: 

• ​Forests are rich in biodiversity because they provide varied habitats for many species of animals, birds, insects, and plants.
• The diversity of plants in forests offers food and shelter for animals, supporting a wide range of life forms.
• Forests also maintain ecological balance by facilitating nutrient cycling, and decomposing plant material enriches the soil for further plant growth. This diversity is crucial for maintaining healthy ecosystems.

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Section - D

Q29. How are camels living in hot desert differ from the camels living in cold desert? (5 Marks)

Ans:

Camels living in hot desert	Camels living in cold desert
1. The camels in the hot desert have long legs with wide hooves.	1. The height and legs of camels in a cold desert are comparatively shorter than those found in a hot desert.
2. Camels in the hot desert have one hump.	2. Camels in the cold desert have two humps which shrink in late winters.
3. Camels in the hot desert do not grow long hair from head to neck.	3. Camels in the cold desert grow long, hair from head to neck, which help them survive in the cold winters.

Q30. (a) What is evaporation?
(b) Describe two conditions affecting its rate with examples.
(c) How does it cause cooling? (5 marks)

Ans: (a) Evaporation is the process by which water molecules at the surface of a liquid gain enough energy to escape into the air as water vapour. It occurs at all temperatures, not just boiling, and is a key part of the water cycle. For example, water from a puddle evaporates over time, disappearing into the air.

(b) Conditions affecting evaporation rate:

• Temperature: Higher temperatures increase the rate of evaporation as the heat provides more energy for water molecules to escape into the air. For example, water evaporates faster in direct sunlight than in shade.

• Air Movement: Wind or moving air increases the rate of evaporation because it moves the water vapour away from the surface, allowing more water molecules to evaporate. This is why clothes dry faster on a windy day compared to a still day.

(c) Evaporation causes cooling because when water molecules absorb heat energy from the surrounding environment to transition into vapour, they take away heat from the surface. As a result, the surface loses energy, which leads to a drop in temperature. This is why water in an earthen pot stays cool even in hot weather; the evaporation process causes the pot to lose heat and cool down.

Q31. (a) What is the life cycle of a plant?
(b) Explain two stages with examples from the bean plant.
(c) Draw a simple life cycle diagram. (5 marks)

Ans: (a) The life cycle of a plant refers to the stages a plant goes through from seed to maturity, reproduction, and back to seed. This cycle includes stages such as seed germination, growth, flowering, and the production of new seeds.

(b) Two stages of the life cycle of the bean plant:

• Germination: The seed absorbs water, causing it to swell and soften. The outer seed coat breaks, and the root (radicle) grows downward, followed by the shoot (plumule) growing upwards toward the surface. This stage is vital for the establishment of the plant.
• Flowering: After several weeks, the bean plant grows leaves and a stem, and eventually produces flowers. These flowers contain reproductive parts that enable pollination. Once pollinated, the flowers develop into pods, each containing seeds that will eventually fall to the ground and start the cycle again.

(c) Life Cycle Diagram:

Seed → Germination → Seedling → Adult Plant → Flowering → Pod with Seeds → (Back to See(d)

Life Cycle of Bean Plant

Q32. (a) What is magnetic separation?
(b) Explain its use with an example.
(c) Suggest another mixture it could separate. (5 marks)

Ans: (a) Magnetic separation is a method used to separate magnetic materials from non-magnetic ones by using a magnet. This technique is effective when one component of a mixture is magnetic, like iron filings, while the other components are not magnetic, like sand.
(b) Example of magnetic separation: In a workshop, a carpenter uses a magnet to separate iron nails from sawdust. The iron nails are attracted to the magnet, while the sawdust remains unaffected and can be removed, making the process efficient and quick.
(c) Another mixture that magnetic separation could be used for is separating iron filings from a mixture of salt and iron filings. The magnet would attract the iron, leaving the salt behind, which could then be collected separately.

Q33. (a) What is circular motion?
(b) Give two examples from daily life.
(c) How does it differ from oscillatory motion? (5 marks)

Ans: (a) Circular motion refers to the motion of an object along a circular path. The object moves in a circle around a fixed point or axis. Examples include the motion of a bicycle wheel or the Earth’s orbit around the Sun.
(b) Two examples of circular motion:

• Ceiling fan blades: The blades of a ceiling fan rotate around a fixed central point.
• Bicycle wheel: As the bicycle moves, the wheels rotate around the axle, following a circular path.

(c) Difference between circular motion and oscillatory motion:

• Circular motion involves continuous movement along a circular path, like the Earth revolving around the Sun or a rotating wheel.
• Oscillatory motion involves movement back and forth in a regular pattern, like a pendulum swinging or a child on a swing.
  While circular motion follows a fixed path in one direction, oscillatory motion involves periodic movement between two points.

Q34. (a) What are renewable resources?
(b) Explain two examples and their benefits.
(c) Why conserve them despite being renewable? (5 marks)

Ans: (a) Renewable resources are natural resources that can be replenished naturally within a short period of time and are not depleted by use. Examples include sunlight, wind, water, and biomass.
(b) Two examples of renewable resources:

• Solar Energy: Solar energy comes from the Sun and is used to generate electricity through solar panels. It is a clean and abundant energy source.

• Wind Energy: Wind energy is harnessed using wind turbines to generate electricity. It is a sustainable energy source that does not produce harmful emissions.

(c) Even though renewable resources are naturally replenished, they still need to be conserved to avoid overuse and to ensure their availability for future generations. For instance, while solar energy is renewable, over-reliance on it without proper management could lead to ecological imbalances in the long run. Conserving these resources ensures that they remain available and effective for future generations.