Science Practice Test - 5 - Class 5 MCQ

Coconut Dispersal by Water:
- Coconuts are adapted to be dispersed by water, which is why they have a unique ability to float.
- The coconut fruit has a tough outer husk that protects the seed inside, allowing it to remain buoyant in water.
- When the coconut falls from the tree and lands in a body of water, such as a river, lake, or ocean, it can be carried away by currents and waves.
- The water dispersal method helps coconuts reach new locations far away from their parent plant, increasing their chances of finding suitable conditions for germination and growth.
Advantages of Dispersal by Water:
- Water dispersal allows coconuts to reach remote islands or coastal areas where other dispersal methods might not be effective.
- Coconuts can travel long distances over water, increasing the chances of colonization in new habitats.
- Water dispersal also protects the coconut from potential predators or competitors that may be present near the parent plant.
Other Dispersal Methods:
- While water dispersal is the most common method for coconuts, they can also be dispersed by other means.
- Wind dispersal is not a significant method for coconuts as their large size and weight make them less likely to be carried by wind.
- Explosive/splitting action is not a common dispersal method for coconuts, as they do not have mechanisms to forcibly eject their seeds.
- Animals can play a role in dispersing coconuts, primarily through consumption and subsequent defecation. However, this method is less common compared to water dispersal.
Therefore, the correct answer is option B: water.

Adaptation of a Grasshopper to Protect Itself from Predators:
Grasshoppers have evolved various adaptations to protect themselves from predators. One of the most common adaptations is camouflage, which allows them to blend in with their surroundings and avoid detection. Here are some key points to consider:
1. Camouflage:
- Grasshoppers have a natural ability to change their color to match their environment, making it difficult for predators to spot them.
- Their body coloration often matches the green or brown tones of the grass or foliage they inhabit, providing effective camouflage.
2. Jumping Ability:
- Grasshoppers are known for their powerful hind legs, enabling them to hop or jump quickly and efficiently.
- This adaptation helps grasshoppers evade predators by swiftly moving away from potential threats.
3. Startle Display:
- Grasshoppers possess a behavior known as a "startle display" or "flash behavior."
- When a predator approaches too closely, grasshoppers may suddenly flash their brightly colored wings or hind legs, startling the predator and giving the grasshopper an opportunity to escape.
4. Chemical Defense:
- While not all grasshoppers possess chemical defenses, some species are known to secrete toxic or distasteful substances.
- These substances can deter predators from attacking or consuming the grasshopper, as they associate the unpleasant taste or experience with the grasshopper's appearance.
Overall, the combination of camouflage, jumping ability, startle displays, and chemical defenses allows grasshoppers to effectively protect themselves from predators and increase their chances of survival.

What enables us to swing our arms?
The ability to swing our arms is facilitated by the ball and socket joint in our shoulders. This joint allows for a wide range of motion and enables us to perform various arm movements.
Here is a detailed explanation of how the ball and socket joint enables arm swinging:
1. Anatomy of the ball and socket joint:
- The ball and socket joint consists of a rounded end of one bone (the ball) fitting into a cup-shaped socket of another bone.
- In our shoulders, the upper arm bone (humerus) has a rounded head that fits into the shallow socket of the shoulder blade (scapula).
2. Range of motion:
- The ball and socket joint provides a high degree of mobility and allows for a wide range of movements, including arm swinging.
- The rounded head of the humerus allows the arm to move in a circular motion around the socket.
3. Muscles and tendons involved:
- Multiple muscles and tendons surround the ball and socket joint to provide stability and control during arm movements.
- The rotator cuff muscles, including the supraspinatus, infraspinatus, teres minor, and subscapularis, play a crucial role in arm swinging.
- These muscles work together to coordinate the movement of the arm and help maintain the ball and socket joint's stability.
4. Arm swinging motion:
- When we swing our arms, the ball and socket joint allows the arm to move freely in a pendulum-like motion.
- The movement involves a combination of flexion, extension, abduction, adduction, and rotation of the arm.
- The swinging motion is coordinated by the contraction and relaxation of the muscles surrounding the joint.
In conclusion, the ball and socket joint in our shoulders enables us to swing our arms by providing a wide range of motion and stability. The coordinated action of muscles and tendons around the joint allows for smooth and controlled arm swinging movements.

The state of matter which has no fixed shape but has definite volume is the liquid state.
The liquid state is characterized by the following properties:
- No fixed shape: Liquids do not have a definite shape and take the shape of the container they are placed in. They flow and can be poured.
- Definite volume: Liquids have a fixed volume, meaning they occupy a specific amount of space, which remains constant regardless of the shape of the container.
Comparison with other states of matter:
- Gaseous state (option A): Gases have neither a fixed shape nor a fixed volume. They can expand to fill the entire space available to them and can be compressed easily.
- Solid state (option C): Solids have both a fixed shape and a fixed volume. They maintain their shape and volume even when placed in different containers.
Conclusion:
Based on the given options, the state of matter that fits the description of having no fixed shape but a definite volume is the liquid state (option B). Liquids can flow and take the shape of their container, but their volume remains constant.

Explanation:
The question asks which substances nail polish, naphthalene balls, and paints may contain. Let's break down the options and explain why each one is correct or incorrect.
A: Sugar
- Nail polish, naphthalene balls, and paints do not contain sugar. Therefore, this option is incorrect.
B: Salt
- Nail polish, naphthalene balls, and paints do not contain salt. Therefore, this option is incorrect.
C: Poison
- Nail polish may contain harmful chemicals such as formaldehyde, toluene, and phthalates, which can be toxic if ingested. Naphthalene balls are used as moth repellents and can be toxic if consumed. Paints may contain lead or other harmful substances. Therefore, this option is correct.
D: Juice
- Nail polish, naphthalene balls, and paints do not contain juice. Therefore, this option is incorrect.
Answer: C (Poison)
- Nail polish, naphthalene balls, and paints may contain toxic substances, making them potentially harmful if ingested or used improperly.
In summary, the correct answer is C: Poison. Nail polish, naphthalene balls, and paints may contain toxic substances that can be harmful to humans.

The seeds of the poppy fruit are dry and dispersed by explosion when we touch them.
Explanation:
The poppy fruit is known for its unique method of seed dispersal. When the seeds are ripe, the fruit capsule dries up and becomes brittle. Upon contact or disturbance, the capsule explodes, releasing the seeds in a sudden burst. This explosive mechanism helps in dispersing the seeds over a wider area.
Why the other options are incorrect:
1. Drumstick: The seeds of the drumstick tree are not dispersed by explosion. They have a hard shell and are usually dispersed by birds or animals.
2. Sycamore: The seeds of the sycamore tree are dispersed by wind. They have a papery wing-like structure that allows them to be carried by air currents.
3. Cotton: Cotton seeds are not dispersed by explosion. They are usually dispersed by wind or human intervention.
Therefore, the correct answer is d. poppy.

Building Blocks of Rocks:
The building blocks of rocks are the components that make up their composition. These building blocks include:
1. Minerals:
- Minerals are naturally occurring inorganic substances that make up the majority of rocks.
- They have a specific chemical composition and crystal structure.
- Examples of minerals include quartz, feldspar, mica, and calcite.
2. Sand particles:
- Sand particles are small, granular materials that are often composed of minerals like quartz.
- They are a common building block of sedimentary rocks, such as sandstone.
3. Pebbles:
- Pebbles are larger than sand particles and are often composed of different types of rocks or minerals.
- They can be a building block in conglomerate or breccia rocks.
4. Stones:
- Stones are larger and more solid than pebbles, usually measuring more than 10 centimeters in diameter.
- They can be made of various types of rocks, such as granite, basalt, or limestone.
Therefore, the correct answer is option B: Minerals. Minerals are the primary building blocks of rocks, while sand particles, pebbles, and stones can also contribute to the composition of certain rock types.

The part of the human body that has involuntary muscles is the intestine.
Explanation:
Involuntary muscles, also known as smooth muscles, are muscles that are not under conscious control. They perform automatic functions in the body, such as the movement of food through the digestive system.
The intestine is a long, tubular organ that forms part of the digestive tract. It is divided into two sections: the small intestine and the large intestine. Both sections of the intestine contain involuntary muscles that help propel food through the digestive system.
Here is a detailed explanation of why the other options are not correct:
- Legs: The legs contain voluntary muscles, which can be consciously controlled. They are responsible for movements such as walking, running, and jumping.
- Arms: Similar to the legs, the arms also contain voluntary muscles that allow for conscious control of movements, such as lifting, throwing, and writing.
- Neck: The neck contains both voluntary and involuntary muscles. While some muscles in the neck, such as those involved in turning the head, are voluntary, others, such as those involved in swallowing and breathing, are involuntary.
- Intestine: The intestine contains involuntary muscles that contract and relax rhythmically to push food through the digestive system. This process, known as peristalsis, allows for the efficient digestion and absorption of nutrients.
In conclusion, the correct answer is D: Intestine.

Mrs. Kiran was able to provide energy during the two days of fasting through the following means:
Fat stored in the body:
- When the body does not receive food for an extended period, it starts to break down stored fat to provide energy.
- Fat is stored in adipose tissue throughout the body and can be utilized as an energy source during fasting or periods of low food intake.
- The breakdown of fat produces fatty acids, which can be converted into energy through a process called beta-oxidation.
Therefore, it is the fat stored in Mrs. Kiran's body that helped provide energy during the two days of fasting.

Webbed feet is an adaptation in aquatic birds.
Aquatic birds have webbed feet, which is an adaptation that helps them navigate and survive in their aquatic habitats. Here is a detailed explanation of why webbed feet are an adaptation in aquatic birds:
1. Definition of webbed feet:
- Webbed feet refer to feet that have skin, known as webbing, connecting the toes.
- This webbing creates a larger surface area that helps birds swim more efficiently in water.
2. Advantages of webbed feet:
- Enhanced swimming ability: The webbing between the toes acts like a paddle, providing more surface area to push against the water, allowing birds to move through water more easily and quickly.
- Improved maneuverability: The webbing allows birds to make quick and precise movements underwater, enabling them to catch prey and avoid predators.
- Efficient diving: Webbed feet help in diving by providing better propulsion and stability underwater.
- Reduced drag: The streamlined shape of webbed feet reduces drag, allowing birds to swim faster with less effort.
3. Examples of aquatic birds with webbed feet:
- Ducks: Ducks have webbed feet that are adapted for swimming and diving.
- Swans: Swans have large webbed feet that enable them to swim gracefully and propel themselves through water.
- Penguins: Penguins have webbed feet that aid them in swimming and diving while hunting for fish.
In conclusion, webbed feet are an adaptation in aquatic birds that provide advantages such as improved swimming ability, maneuverability, diving efficiency, and reduced drag. These adaptations allow aquatic birds to thrive in their aquatic habitats.

To determine which animal is an omnivore, we need to understand the characteristics of omnivores and analyze the given options.
Characteristics of an omnivore:
- Omnivores are animals that have the ability to consume both plant matter and animal flesh.
- They have a varied diet that includes plants, fruits, vegetables, insects, and small animals.
Now let's analyze the given options to identify the omnivore:
Option A:
- The image shows a lion, which is a carnivore. Lions primarily consume meat and do not eat plants. Therefore, option A is not an omnivore.
Option B:
- The image shows a giraffe, which is a herbivore. Giraffes feed on leaves, fruits, and plants but do not consume meat. Therefore, option B is not an omnivore.
Option C:
- The image shows a bear, which is an omnivore. Bears have a diet that includes both plant matter and animal flesh. They eat fruits, berries, fish, insects, and sometimes even larger animals. Therefore, option C is an omnivore.
Option D:
- The image shows a crocodile, which is a carnivore. Crocodiles primarily consume meat and do not eat plants. Therefore, option D is not an omnivore.
Therefore, the correct answer is Option C: Bear, as it is the only animal among the given options that is an omnivore.

Areas where satellites can be used:
- Weather forecast: Satellites can be used to monitor weather patterns and gather data on temperature, humidity, wind speed, and precipitation. This information is crucial for accurate weather forecasting and predicting natural disasters such as hurricanes and storms.
- Telecommunication: Satellites play a vital role in global telecommunications by providing long-distance communication links. They enable television and radio broadcasting, internet connectivity, and phone services in remote areas where traditional infrastructure is not available or feasible.
- Data processing: Satellites are used to collect and transmit data for various purposes. They can gather information on environmental changes, monitor natural resources, track the movement of ships and aircraft, and provide surveillance and intelligence for military and security purposes.
- Navigation and GPS: Satellites form the backbone of global positioning systems (GPS) that are used for navigation and location-based services. GPS satellites provide precise positioning and timing information, enabling applications such as vehicle tracking, mapping, and navigation systems.
- Astronomy and space research: Satellites, such as telescopes and observatories, are used to study celestial bodies and phenomena. They capture images and data from outer space, helping scientists understand the universe, discover new planets, and study cosmic events like supernovae and black holes.
- Disaster management: Satellites assist in disaster management by providing real-time information on natural disasters such as earthquakes, floods, and wildfires. They can help in assessing the extent of damage, coordinating rescue operations, and monitoring the recovery process.
- Environmental monitoring: Satellites are used to monitor and assess the Earth's environment. They collect data on climate change, deforestation, pollution levels, and changes in land and water resources. This data is crucial for understanding and managing environmental issues.
- Scientific research: Satellites are used in various scientific research fields such as geology, oceanography, and atmospheric studies. They provide valuable data on Earth's physical properties, climate patterns, and natural phenomena, contributing to scientific understanding and advancements.
- Surveillance and security: Satellites are utilized for surveillance and security purposes. They can monitor borders, detect illegal activities, track the movement of military assets, and provide early warning systems for potential threats.
- Remote sensing: Satellites equipped with sensors and cameras can capture images and collect data from remote areas. This data is used for mapping, land-use planning, agriculture, forestry, and resource management.
Overall, satellites have a wide range of applications and are crucial for various sectors including communication, weather forecasting, scientific research, and disaster management. They provide valuable data and enable connectivity and monitoring on a global scale.

The process that involves a change of state from the liquid to the gaseous state is evaporation. Here's a detailed explanation:
Evaporation:
- Evaporation is the process by which a liquid changes into a gas or vapor at a temperature below its boiling point.
- It typically occurs on the surface of the liquid, where molecules with higher kinetic energy escape from the liquid phase and enter the gaseous phase.
- It is a spontaneous process driven by the energy transfer from the liquid to the surrounding environment.
- Evaporation is influenced by factors such as temperature, surface area, humidity, and airflow. Higher temperatures and larger surface areas promote faster evaporation.
Other processes involved in state changes are:
Condensation:
- Condensation is the opposite of evaporation, where a gas or vapor changes into a liquid.
- It occurs when the temperature of the gas or vapor is lowered below its dew point, causing the molecules to lose energy and come together to form a liquid.
Melting:
- Melting is the process by which a solid substance changes into a liquid state.
- It occurs when the temperature of the solid is raised above its melting point, causing the crystal lattice structure to break down, allowing the particles to move more freely.
Freezing:
- Freezing is the opposite of melting, where a liquid substance changes into a solid state.
- It occurs when the temperature of the liquid is lowered below its freezing point, causing the particles to slow down and form a solid structure.
In summary, the process that involves a change of state from the liquid to the gaseous state is evaporation.

Explanation:
To move an object to a higher place, a simple machine called an inclined plane is used. Here is a detailed explanation of why the inclined plane is the correct answer:
Inclined Plane:
- An inclined plane is a flat surface that is sloped, allowing objects to be moved up or down with less force.
- It is a simple machine that reduces the amount of force needed to move an object vertically.
- The inclined plane allows the object to be lifted gradually over a longer distance, reducing the effort required.
- It can be a ramp, a hill, or any surface that forms an angle with the horizontal plane.
Other Options:
Let's briefly discuss the other options and why they are not the correct answers:
- Wedge: A wedge is used to split or separate objects. It is not specifically designed for moving objects to a higher place.
- Wheel and Axle: A wheel and axle system is used to reduce friction and transmit force. While it can be used to move objects, it is not specifically designed for moving objects to a higher place.
- Pulley: A pulley is a simple machine that uses a wheel with a groove and a rope to lift heavy objects. While it can be used to move objects vertically, it is not specifically designed for moving objects to a higher place.
In conclusion, the correct answer is C: Inclined Plane because it is specifically designed to move objects to a higher place by reducing the effort required.

Advice for your mother while working in the kitchen:
- Wear a cotton dress. Cotton is a natural fabric that is breathable and allows air circulation, keeping the body cool and comfortable in a hot kitchen environment.
- Cotton absorbs sweat and moisture, preventing the dress from sticking to the skin and causing discomfort.
- It is also important to choose a dress that is loose-fitting and allows freedom of movement while working in the kitchen.
- Avoid wearing nylon or rayon dresses as they are synthetic materials that do not allow proper air circulation and can make your mother feel hot and sweaty.
- Nylon and rayon also tend to trap odors more easily, which can be unpleasant in a kitchen setting.
- Cotton dresses are easy to wash and maintain, making them a practical choice for working in the kitchen.
- Additionally, cotton is a durable fabric that can withstand regular use and frequent washing.
- Your mother can also consider wearing an apron to protect her dress from spills and stains while working in the kitchen.
Remember, comfort and practicality should be prioritized when choosing a dress for working in the kitchen.

Layer of air surrounding the earth:
The layer of air surrounding the Earth is called the atmosphere. It is composed of various gases and extends from the surface of the Earth to outer space. Here is a detailed explanation of the Earth's atmosphere:
1. Composition:
- The atmosphere is primarily composed of nitrogen (78%) and oxygen (21%).
- Other gases present in smaller amounts include carbon dioxide, water vapor, and various trace gases.
2. Layers:
- The atmosphere is divided into different layers based on temperature changes with altitude.
- The layers, from closest to the Earth to farthest, are the troposphere, stratosphere, mesosphere, thermosphere, and exosphere.
3. Troposphere:
- The troposphere is the lowest layer of the atmosphere, extending from the Earth's surface up to about 8-15 kilometers.
- It is where weather occurs and contains most of the Earth's clouds, air pollutants, and water vapor.
4. Stratosphere:
- The stratosphere lies above the troposphere and extends up to about 50 kilometers.
- It contains the ozone layer, which absorbs and filters out a significant amount of the Sun's ultraviolet radiation.
5. Mesosphere:
- The mesosphere is above the stratosphere and extends up to about 85 kilometers.
- It is the layer where meteors burn up upon entering the Earth's atmosphere.
6. Thermosphere:
- The thermosphere is above the mesosphere and extends up to about 600 kilometers.
- It is characterized by high temperatures due to the absorption of solar radiation.
7. Exosphere:
- The exosphere is the outermost layer of the atmosphere, transitioning into space.
- It is where the atmosphere gradually thins out, and its gases dissipate into the vacuum of space.
Overall, the atmosphere plays a crucial role in protecting life on Earth by regulating temperature, providing oxygen, and shielding us from harmful radiation.

Immovable Joint:
An immovable joint, also known as a fibrous joint, is a type of joint that allows little to no movement between the bones. These joints are held together by dense fibrous connective tissue and are highly stable. One example of an immovable joint is the joint in the upper part of the skull.
Explanation:
The joint in the upper part of the skull, also known as the cranial sutures, is an example of an immovable joint. Here's why:
1. Structure: The bones of the skull are connected by fibrous connective tissue, which forms the cranial sutures. These sutures are composed of dense collagen fibers that firmly hold the bones together.
2. Function: The primary function of the cranial sutures is to provide stability and protection to the brain. The immovability of these joints ensures that the bones of the skull do not move independently, maintaining the structural integrity of the skull.
3. Lack of movement: Unlike other joints in the body, such as those in the hand, wrist, or shoulder, the joints in the upper part of the skull do not allow any significant movement. The bones of the skull are tightly fused together, preventing any motion between them.
4. Importance: The immovable nature of the joints in the upper part of the skull is crucial for protecting the brain from external forces. These joints provide a strong and rigid structure that can withstand impact and trauma.
In conclusion, the joint in the upper part of the skull is an example of an immovable joint. Its fibrous nature and lack of movement make it an essential component of the skull's protective function.

The changing shapes of the moon are called phases.

Answer:
Definition: Rocks formed when existing rocks change due to heat or pressure are called metamorphic rocks.
Explanation:
Metamorphic rocks are formed when existing rocks undergo physical and chemical changes due to heat and pressure. These changes occur deep within the Earth's crust. Here is a detailed explanation of each option:
A: Sedimentary rocks: Sedimentary rocks are formed from the accumulation and lithification of sediments, such as sand, silt, and clay. They are not formed from the changes caused by heat or pressure.
B: Igneous rocks: Igneous rocks are formed from the cooling and solidification of molten magma or lava. They are not formed from the changes caused by heat or pressure.
C: Metamorphic rocks: Metamorphic rocks are formed when existing rocks, either sedimentary or igneous, are subjected to intense heat and pressure. These changes cause the minerals within the rocks to recrystallize, resulting in a new rock with different physical and chemical properties.
D: All of these: This option is incorrect because sedimentary and igneous rocks are not formed from the changes caused by heat or pressure. Only metamorphic rocks are formed in this way.
Therefore, the correct answer is option C: metamorphic rocks.