Science Practice Test - 2 - Class 5 MCQ

The correct answer is that a seahorse is a fish. Here's why:

• Toads are amphibians, not reptiles.
• Jellyfish are invertebrates, lacking a backbone.
• A penguin is a bird, not a mammal.
• Seahorses belong to the fish group, specifically classified as marine fish.

•  Mushrooms are classified as fungi.
• Unlike plants, fungi do not perform photosynthesis and thus are not food producers.
• Mushrooms obtain nutrients through decomposing organic matter, differentiating them from parasites, which feed on living hosts.
• Mushrooms are not predators, as they do not hunt or capture prey.
• Fungi play vital roles in ecosystems, particularly in nutrient cycling and decomposition.

The tail fin of a fish is crucial for its movement and stability in water. Its functions include:

• Providing balance while swimming.
• Assisting in changing direction swiftly.

The tail fin helps fish keep their balance and move easily in different directions.

Light, small, and dry seeds are typically dispersed by the wind. This method is effective for such seeds because:

• They are easily carried by air currents.
• Their structure often includes features like wings or hairs to aid in aerial travel.
• This method allows seeds to travel long distances from the parent plant.

Afforestation helps in soil conservation by:

• Planting trees to reduce soil erosion as roots hold the soil together.
• Improving soil fertility by adding organic matter from falling leaves.
• Increasing water retention in the soil due to improved root systems.

The winged seed of the drumstick tree is primarily dispersed by the wind. This is because:

• The seeds have a wing-like structure that allows them to glide through the air.
• This adaptation helps them travel away from the parent tree, increasing the chance of finding suitable soil for germination.

Fire can be extinguished by employing the following methods:

• Removing the burning substance to eliminate fuel.
• Cutting off the supply of air to suffocate the fire.
• Cooling the burning material below its kindling temperature.

All of these methods are effective in putting out a fire.

The needle-shaped leaves of a cactus help reduce water loss. These leaves:

• Minimise the surface area to reduce evaporation.
• Offer protection from the sun, helping the cactus conserve water.
• Are an adaptation to survive in hot and dry conditions.

• The figure illustrates the formation of a solar eclipse, which occurs when:
• The Moon moves between the Earth and the Sun.
• The Moon casts a shadow on Earth, partially or fully blocking the Sun's light.
• This alignment is rare and can only happen during a new moon phase.
• The diagram likely shows the alignment of the Sun, Moon, and Earth, indicating the blocking of sunlight, characteristic of a solar eclipse.

The gas used in fizzy drinks to provide the tingling taste is carbon dioxide.

• Carbon dioxide is dissolved in the drink under pressure.
• When you open the bottle, the pressure is released, causing the gas to form bubbles.
• This process creates the fizz and tingling sensation.

The rat is an omnivore.

• Omnivores eat both plants and meat.
• Rats consume a variety of foods, including grains, fruits, and small animals.

• Condensation is the process taking place at T.
• It occurs when water vapor in the air cools and changes back into liquid droplets.
• This process is essential in the water cycle, forming clouds and fog.
• Condensation releases heat, known as latent heat, which can influence weather patterns.
• It contrasts with evaporation, where liquid water turns into vapor.
• In diagrams of the water cycle, condensation is typically represented by cloud formation.

The young seedling initially relies on stored nutrients.

• The stored food is found in the cotyledon.
• Cotyledons provide energy until the seedling can photosynthesize.

Humus is formed through the decomposition of organic matter.

• Mould is crucial as it breaks down dead materials, enriching the soil.
• Other options like Duckweed and Hydrilla are aquatic plants and do not significantly contribute to humus formation.

• The Earth rotates on its axis, causing different parts of the planet to experience day and night.
• Cities on the side of the Earth facing away from the Sun are in nighttime.
• In the diagram, city S is positioned on the dark half of the Earth, indicating it is currently experiencing night.
• Cities P, Q, and R are on the illuminated side, experiencing daytime.
• Therefore, city S is the correct choice for the city experiencing nighttime.

The easiest way to separate iron nails from sawdust is by using a magnet.

• A magnet attracts the iron nails, leaving the sawdust behind.
• This method is quick and efficient.

• A ramp is classified as an inclined plane.
• An inclined plane is a flat surface tilted at an angle to help move objects across heights.
• It reduces the force needed to lift objects by extending the distance over which the force is applied.
• This mechanical advantage facilitates easier movement of heavy loads up and down the slope.
• Unlike levers, wedges, or screws, which are different types of simple machines, the ramp's primary function is to ease vertical movement through a gradual incline.

When germs enter through a cut in the skin, it can lead to infections such as:

• Tetanus: A serious bacterial infection that affects the nerves.

It is important to clean cuts promptly to prevent infections.

The ear is a sensory organ that picks up sound waves, allowing us to hear. It is also essential to our sense of balance: the organ of balance (the vestibular system) is found inside the inner ear. It

The animals that have scales on their body surfaces include:

• Crocodile: These reptiles have tough, bony scales known as osteoderms.
• Snake: Their bodies are covered with overlapping scales that help in movement.
• Pangolin: They possess unique, protective keratin scales.

These three animals are known for their distinctive scaly surfaces.