Primary 3 Science Test 01

When light hits a rough surface, it scatters in different directions due to the irregularities on the surface. This phenomenon is known as diffuse reflection. Unlike smooth surfaces where light reflects at the same angle as it hits, rough surfaces cause the light to reflect in multiple directions, resulting in a diffused reflection. Therefore, the statement "Light can be reflected on a rough surface also known as diffuse reflection" is true.

A seed is a living thing and can grow into a seedling. Seeds are the reproductive structures of plants and contain all the necessary genetic material and nutrients to develop into a new plant. They are capable of germination, where they absorb water and begin to grow roots, shoots, and leaves. This process allows the seed to develop into a seedling and eventually mature into a fully grown plant. Therefore, a seed is indeed a living thing and has the potential to grow into a new plant.

Both spiders and insects have exoskeletons, which is a hard outer covering that provides support and protection for their bodies. This exoskeleton is made of a tough substance called chitin. It serves as a protective barrier against predators and helps to maintain the shape and structure of the spider or insect. Having an exoskeleton also allows spiders and insects to move and interact with their environment effectively. Therefore, the statement that both spiders and insects have exoskeletons is true.

When a magnet is exposed to high temperatures, the thermal energy can disrupt the alignment of its magnetic domains, causing them to become disordered. This disruption weakens or even destroys the magnetic field of the magnet, resulting in a loss of magnetism. Therefore, it is true that a magnet will lose its magnetism by burning at high temperature.

The similarity between a mushroom and a bird's nest fern is that they can both reproduce by spores. Spores are tiny reproductive cells that are released into the environment and can develop into new individuals under favorable conditions. Both mushrooms and bird's nest ferns produce spores as part of their reproductive process, allowing them to spread and reproduce. This method of reproduction is different from plants that reproduce through seeds or other means.

The reason that the two magnets below are going in different directions is because like poles in magnets repel each other. Since both magnets have the same color, they are likely to have the same polarity. As a result, the like poles of the magnets are facing each other, causing them to repel and move away from each other in opposite directions.

The statement "All bacteria are harmful" is false because not all bacteria are harmful. While some bacteria can cause diseases, there are also many beneficial bacteria that play important roles in various ecosystems and even in the human body.

Plastic being light and waterproof are valid reasons for making it a suitable material for a raincoat. However, the fact that it is fragile and can conduct electricity are not valid reasons. Fragility would make the raincoat easily breakable, while conductivity would pose a safety risk during rainy weather. Therefore, the correct answer is B and D.

This statement is false. Without the presence of light, it is not possible for us to see in the dark. Our eyes rely on light to detect and process visual information. In the absence of light, our eyes cannot receive any visual stimuli, resulting in darkness and the inability to see.

A magnet can attract objects other than magnets, such as certain metals. This is because a magnet generates a magnetic field that can exert a force on objects that are responsive to magnetic fields.

Material Z would be used to make a tuxedo because it is the only option provided that is suitable for making formal attire. Material X and Material Y are not specified as appropriate materials for making a tuxedo, and "None of above" implies that none of the materials listed are suitable. Therefore, Material Z is the most logical choice for making a tuxedo.

The animals are grouped according to their body covering. This means that animals with similar types of body coverings, such as fur, feathers, scales, or skin, are placed together in the same group. This classification is based on the physical characteristics and adaptations of the animals' body coverings, which help them survive in their respective environments.

When a needle is stroked with a south facing magnet multiple times, the needle itself becomes magnetized. The south pole of the magnet attracts the north pole of the needle, causing the needle to align itself in a north-south direction. Therefore, the needle's eye will become the south pole of the magnet after being stroked with the south facing magnet multiple times.

This answer is correct because it correctly identifies the label A as the leaf blade, B as the leaf veins, and C as the leaf stalk. The leaf blade is the broad, flat part of the leaf that is responsible for photosynthesis. The leaf veins are the vascular tissue that transports water, nutrients, and sugars throughout the leaf. The leaf stalk, also known as the petiole, is the slender structure that attaches the leaf blade to the stem of the plant.

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The correct answer is that both animals have segmented bodies. This means that their bodies are divided into distinct sections or segments. This characteristic is common in many types of animals, including insects, worms, and crustaceans. Segmented bodies provide flexibility and allow for efficient movement and adaptation to different environments.

The animal grouped incorrectly in the above question is Penguin. Tuna, Lizard, and Human are all animals, but Penguin is a bird.

Aluminium is a metallic element that is extracted from bauxite ore through various industrial processes, making it a man-made material. On the other hand, polyester is a synthetic polymer that is derived from petroleum, a natural resource, and undergoes chemical reactions to form the final product. Therefore, aluminium is man-made, while polyester is man-made.

The possible plant for plant A is Ixora.

A seedling has seed leaf to provide food. This is because when a seed germinates, it produces a small plant called a seedling. The seedling initially relies on the food stored in the seed itself, which is stored in the seed leaf or cotyledon. The seed leaf provides essential nutrients and energy for the seedling to grow until it can develop its own leaves and begin photosynthesis to produce its own food.

The correct answer is "Fungi feed on living things." This statement is incorrect because fungi are heterotrophic organisms that obtain nutrients by decomposing organic matter or by parasitizing other organisms. They do not feed on living things directly.

Part X in the diagram is responsible for transporting water and mineral salts for the plant. This suggests that it plays a crucial role in the plant's nutrient uptake and distribution. It is likely a specialized structure such as xylem or vascular tissue that helps in the movement of water and minerals from the roots to the rest of the plant.

The characteristic of a living thing in the box experiment is that plants can respond to changes. This means that plants have the ability to detect and react to stimuli in their environment, such as light, gravity, or temperature. They can adjust their growth, movement, or other physiological processes in response to these stimuli. This ability to respond to changes is a key characteristic of living organisms.

Copper is not water proof. It is a highly conductive metal that is commonly used in electrical wiring and plumbing due to its excellent conductivity and corrosion resistance. However, copper is not water proof as it can react with water and undergo oxidation over time.

The system shown in the given information is the muscular system. This system is responsible for the movement of the body and maintaining posture. It consists of muscles that are attached to bones and work together to allow for voluntary and involuntary movements. The muscular system also helps in the circulation of blood and the movement of food through the digestive system.

The shape of the tree below is dome-shaped. This can be inferred from the description provided, which states "Dome Shaped Tree" and "Dome" as the options. The term "dome-shaped" suggests that the tree has a rounded, curved shape resembling a dome. Therefore, the correct answer is Dome Shaped Tree.

A magnet is also known as a lodestone because lodestone is a naturally occurring magnetic mineral. It has the ability to attract certain metals, such as iron, and has been used for centuries in compasses and navigation. The term "lodestone" is derived from the Middle English word "lode," meaning "way" or "course," and "stone," referring to the mineral's solid nature.

The constriction is missing from the thermometer. A constriction is a narrow point in the thermometer's tube that allows the temperature to be measured accurately. Without it, the thermometer will not function properly and will not be able to provide accurate temperature readings.

To keep them from cold or keep them warm NOT keep them from warm.

Plasticine is classified as a solid because it has a definite volume and shape. Even though it can be moulded into various shapes, it will maintain its new shape unless an external force is applied to modify it. This characteristic of plasticine aligns with the properties of a solid, which include having a definite shape and volume.

A clinical thermometer is designed specifically for measuring human body temperature and has a limited range of 35º to 42º. On the other hand, a laboratory thermometer is used for various scientific purposes and has a wider temperature range of -10º to 110º. The difference lies in the range of temperatures that each thermometer can measure.

Paramecium and amoeba are similar in that they are both microorganisms and can only be seen through a microscope. They belong to the group of single-celled organisms that are too small to be visible to the naked eye. The use of a microscope is necessary to observe their structures and movements.

The constriction in the thermometer prevents the alcohol from flowing back to the bulb after the temperature measurement is taken. This is important because it allows for an accurate temperature reading to be recorded. If the alcohol were to flow back to the bulb, it would affect the measurement and make it difficult to determine the correct temperature. Therefore, the constriction serves the function of ensuring that the alcohol remains in the part of the thermometer where the temperature is being measured.

We can see with the presence of light because light travels in a straight line and when it encounters an object, it bounces off and reflects into our eyes. This reflected light carries information about the object's color, shape, and texture, which is then processed by our brain to form an image. Without light, there would be no source of illumination, and therefore no reflection or perception of objects around us.

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