Royal College Grade 06 Science First Term Paper English Medium Classes Question and Answers Explanation

1. Question: A type of energy is,

Answer Choices:

(1) Water

(2) Air

(3) Light

(4) Oxygen

Correct Answer: (3) Light

Explanation: Light energy is a form of electromagnetic radiation that is visible to the human eye and is a fundamental form of energy used by living organisms and various technologies.

2. Question: Select the beneficial effect of micro-organisms,

Answer Choices:

(1) Decomposing garbage.

(2) Causing different diseases.

(3) Living in water, soil, and air.

(4) Not visible to the naked eye.

Correct Answer: (1) Decomposing garbage.

Explanation: Micro-organisms play a crucial role in decomposing organic matter, including garbage, which helps in recycling nutrients and maintaining ecological balance.

3. Question: Select the incorrect statement,

Answer Choices:

(1) In the process of producing energy in the body, carbon dioxide is released.

(2) For the process of photosynthesis, carbon dioxide is taken from the air.

(3) There is no limitation of growth in both plants and animals.

(4) The energy needed for photosynthesis is provided by the sun.

Correct Answer: (3) There is no limitation of growth in both plants and animals.

Explanation: The statement that there is no limitation of growth in both plants and animals is incorrect because both plants and animals have specific growth limits dictated by factors such as genetic makeup, environmental conditions, and available resources.

4. Question: The animal that cannot move but shows different movements is,

Answer Choices:

(1) Coral polyp

(2) Jellyfish

(3) Starfish

(4) Snail

Correct Answer: (1) Coral polyp

Explanation: Coral polyps are sessile animals, meaning they are attached to a substrate and cannot move freely. However, they exhibit movement through extension and contraction of their tentacles for feeding and defense.

5. Question: Select the group of materials, which shows brittleness,

Answer Choices:

(1) Chalk, Copper, Glass

(2) Charcoal, Chalk, Glass

(3) Iron, Charcoal, Copper

(4) Lead, Charcoal, Chalk

Correct Answer: (1) Chalk, Copper, Glass

Explanation: Brittleness is a property of materials that fracture or break easily under stress without significant deformation. Chalk and glass are examples of brittle materials.

6. Question: Not a type of precipitation,

Answer Choices:

(1) Snow

(2) Hail

(3) Water in wells

(4) Rain

Correct Answer: (3) Water in wells

Explanation: Water in wells is not considered a type of precipitation. Precipitation refers to any form of water, such as rain, snow, sleet, or hail, that falls from the atmosphere to the Earth's surface.

7. Question: The percentage of consumable water on earth is,

Answer Choices:

(1) 2.58%

(2) 10%

(3) 0.01%

(4) 97.4%

Correct Answer: (4) 97.4%

Explanation: The majority of the Earth's water, about 97.4%, is found in oceans and seas. However, this water is saline and not suitable for direct consumption without desalination.

8. Question: Which is not a physical property of “gold”?

Answer Choices:

(1) Ductility

(2) Malleability

(3) Lustre (shining)

(4) Elasticity

Correct Answer: (4) Elasticity

Explanation: Gold is a ductile, malleable metal with a lustrous appearance, but it is not elastic. Elasticity refers to the ability of a material to return to its original shape after deformation, which is not a characteristic of gold.

9. Question: The amount of water that we have to consume per day is,

Answer Choices:

(1) 2 liters

(2) 1 liter

(3) 500 milliliters

(4) 5 liters

Correct Answer: (1) 2 liters

Explanation: The recommended daily intake of water for an average adult is approximately 2 liters, although individual requirements may vary depending on factors such as age, gender, activity level, and climate.

10. Question: ‘Malleability’ can be defined as,

Answer Choices:

(1) The ability of a metal to be drawn into thin wires without breaking.

(2) The ability of a metal to be drawn into thin sheets without breaking.

(3) Tendency of a material to break easily.

(4) The property of increasing the length by a force.

Correct Answer: (2) The ability of a metal to be drawn into thin sheets without breaking.

Explanation: Malleability is the property of a material that allows it to be hammered, rolled, or pressed into thin sheets without breaking or cracking. It is a characteristic often observed in metals.

11. Question: An animal that does not suck juice is,

Answer Choices:

(1) Butterfly

(2) Bee

(3) Cockroach

(4) Fruit fly

Correct Answer: (3) Cockroach

Explanation: Cockroaches are omnivorous scavengers and do not suck juice like butterflies or bees. They typically feed on a wide range of organic matter, including food scraps, decaying matter, and even other insects.

12. Question: The chemical that can be used to identify carbon dioxide is,

Answer Choices:

(1) Copper sulphate

(2) Condis

(3) Lime water

(4) Water

Correct Answer: (3) Lime water

Explanation: Lime water (calcium hydroxide solution) turns milky in the presence of carbon dioxide due to the formation of calcium carbonate, which can be used as a simple test to identify the presence of carbon dioxide gas.

13. Question: Granite is used for the foundations of houses because it has the property of,

Answer Choices:

(1) Hardness

(2) Roughness

(3) Ductility

(4) Elastic nature

Correct Answer: (1) Hardness

Explanation: Granite is a hard, durable, and

strong rock with excellent compressive strength, making it suitable for building foundations and other structural applications where strength and stability are essential.

14. Question: What will be the correct observation and conclusion after making a hole in balloon B using a pin?

Answer Choices:

Observation Conclusion

(1) Side ‘B’ moves downwards. - Air has a mass

(2) Side ‘A’ moves downwards. - Air has a mass

(3) Side ‘A’ moves downwards. - Air hasn’t a mass

(4) Side ‘B’ moves downwards. - Air hasn’t a mass

Correct Answer: (1) Side ‘B’ moves downwards. - Air has a mass

Explanation: When a hole is made in balloon B, the side containing air moves downwards due to the force of gravity acting on the mass of air inside the balloon. This observation indicates that air has mass, as it experiences gravitational attraction.

15. Question: Which of the following vegetables contains the highest percentage of water?

Answer Choices:

(1) Long beans

(2) Leeks

(3) Cucumber

(4) Brinjal

Correct Answer: (3) Cucumber

Explanation: Cucumber has a high water content, with approximately 95% of its weight consisting of water. It is known for its hydrating properties and is often consumed raw in salads or as a refreshing snack.

16. Question: The process of producing energy in living organisms is,

Answer Choices:

(1) Nutrition

(2) Reproduction

(3) Respiration

(4) Growth

Correct Answer: (3) Respiration

Explanation: Respiration is the process by which living organisms generate energy from the oxidation of organic molecules, typically glucose, to produce ATP (adenosine triphosphate) and other energy-rich molecules needed for cellular functions.

17. Question: Select the incorrect statement about water.

Answer Choices:

(1) Water exists in three physical states.

(2) Pure water contains no dissolved salts.

(3) The water in lagoons is known as freshwater.

(4) Human body consists of over 70% of water.

Correct Answer: (4) Human body consists of over 70% of water.

Explanation: The statement is incorrect because the human body typically consists of approximately 60% water, not over 70%. Water plays a vital role in various physiological processes, including hydration, temperature regulation, and nutrient transport.

18. Question: What is the most suitable equipment used to observe micro-organisms?

Answer Choices:

(1) Binocular

(2) Telescope

(3) Compound microscope

(4) Hand lens

Correct Answer: (3) Compound microscope

Explanation: A compound microscope is the most suitable equipment for observing micro-organisms due to its high magnification capabilities and the ability to resolve microscopic details of cells, bacteria, and other small organisms.

19. Question: Select the pair of materials that can be turned into solid, liquid, and gaseous states easily.

Answer Choices:

(1) Copper and Iron

(2) Brass and gold

(3) Wax and water

(4) Steel and copper

Correct Answer: (3) Wax and water

Explanation: Wax and water can undergo phase changes between solid, liquid, and gaseous states relatively easily under ambient conditions, depending on factors such as temperature and pressure.

20. Question: The incident that does not belong to non-living organisms is,

Answer Choices:

(1) Folding leaves of some plants in the evening

(2) Burning of a piece of wood

(3) Propagation of green gram seeds and growing into plants

(4) Calf feeding from its mother

Correct Answer: (4) Calf feeding from its mother

Explanation: Calf feeding from its mother is a biological process involving living organisms, whereas the other incidents listed involve physical or chemical changes associated with non-living entities or processes.

Question: In the blanks by using the given words below. (chemicals, respiratory movements, detergents, dehydration, mass, gills, aquatic, surface water, type of food, condenses, evaporating)

(i) Animals can be categorized into 3 groups as herbivores, carnivores, and omnivores based on the ………………………………………. they eat. Answer: type of food Explanation: Animals are classified into herbivores, carnivores, or omnivores based on the type of food they consume. Herbivores eat plants, carnivores eat meat, and omnivores eat both plants and meat.

(ii) More kidney patients can be seen in the north-central province because the water in that area contains ………………………………………. Answer: chemicals Explanation: Chemicals present in water sources, such as pollutants or contaminants, can contribute to health issues like kidney problems. Therefore, the high incidence of kidney patients in the north-central province may be linked to the presence of harmful chemicals in the water.

(iii) Water vapor in the atmosphere ………………………………………. into tiny drops of water and can be seen on the outer surface of the glass of a closed air-conditioned vehicle on a cold day. Answer: condenses Explanation: When water vapor in the atmosphere loses heat energy, it condenses into tiny droplets of liquid water, forming fog or dew. Similarly, condensation occurs on the outer surface of a glass in a closed air-conditioned vehicle when warm air comes into contact with the cooler surface of the glass.

(iv) ………………………………………. Can occur when more water is removed from the body, due to vomiting and diarrhea. Answer: Dehydration Explanation: Dehydration occurs when the body loses more fluids (water) than it takes in, leading to an imbalance in the body's water content. This can happen due to factors such as excessive sweating, vomiting, or diarrhea.

(v) The amount of matter in an object is known as the ………………………… of the object. Answer: mass Explanation: Mass is a measure of the amount of matter in an object. It is commonly measured in units such as kilograms or grams and is different from weight, which is the force exerted by gravity on an object's mass.

(vi) The respiratory organ of a fish is ………………………………………. Answer: gills Explanation: Fish respire through gills, which are specialized organs that extract oxygen from water and release carbon dioxide. Gills provide a large surface area for gas exchange, allowing fish to extract oxygen efficiently from their aquatic environment.

(vii) Water in the ocean belongs to ………………………………………. Answer: aquatic Explanation: Water in the ocean is considered aquatic, meaning it is related to or found in water. The term "aquatic" is used to describe anything that is connected with or lives in water.

(viii) When washing clothes in water bodies, ……………………………. are added into water, and it becomes polluted. Answer: detergents Explanation: Detergents are commonly used in washing clothes as they help to remove dirt and stains. However, when detergents are added to water bodies during washing, they can contribute to water pollution by introducing chemicals that may harm aquatic life and ecosystems.

(ix) Common salt is produced in salt pans by ………………………………………. sea water. Answer: evaporating Explanation: Common salt (sodium chloride) is produced by evaporating seawater in salt pans or salt evaporation ponds. As the water evaporates under the sun's heat, it leaves behind salt crystals, which are then harvested for various purposes.

(x) Plants are respiring but do not show ………………………………………. Answer: respiratory movements Explanation: While plants undergo respiration to produce energy, they do not exhibit respiratory movements like animals do. Plants do not have specialized respiratory organs or mechanisms for movement related to respiration.

(xi) Lotus is an ………………………………………. plant. Answer: aquatic Explanation: Lotus is an aquatic plant that grows in or near water. It typically has large, round leaves that float on the water's surface and produces beautiful flowers that emerge above the surface.

(3) Mark () or (X)

(i) Plants show diversity according to their living environment. () (ii) Light hasn’t a mass but occupies space. () (iii) When turning a gas jar upside down, it is easy to fill the smoke of joss sticks. (X) (iv) Mercury is a substance in a liquid state. () (v) Animals are heterotrophic. () (vi) Plants release oxygen to the atmosphere in photosynthesis. () (vii) All creeping animals do not have legs. (X) (viii) The tip of bo-leave is long. (X) (ix) Steam is an example of liquid water. (X) (x) Latex of jak does not dissolve in water. () (xi) The solid state of water can be seen in glaciers. ()

(4) (i) Which kind of features should be used in classifying organisms using a dichotomous key. Answer: Physical characteristics or traits Explanation: A dichotomous key is a tool used in biology for identifying organisms based on a series of choices between alternative characteristics or traits. These characteristics can include physical features such as size, shape, color, or other observable traits.

(ii) Fill in the blanks of a, b, c, d, e, and f: Goldfish, elephant, cock, cow, cobra, parrot. Answer: c. Elephant, Cow Explanation: The provided options correctly match animals that are typically associated with specific pairs: elephants and cows are large mammals, while goldfish, cock, cobra, and parrot are not.

(iii) Classify given animals according to the type of food they eat. Answer:

• Cock: Omnivore
• Cobra: Carnivore
• Parrot: Herbivore Explanation: Cockroaches are omnivores, meaning they consume both plants and animals. Cobras are carnivores, feeding primarily on other animals. Parrots are herbivores, primarily consuming plant matter such as fruits, seeds, and nuts.

(iv) Mention 2 aquatic animals except 'fish'. Answer:

• Dolphin
• Crab Explanation: Dolphins are marine mammals that live in aquatic environments, while crabs are crustaceans found in various aquatic habitats such as oceans, rivers, and estuaries