All questions of Animals for Class 5 Exam

Answer : 'a'

The correct answer is option D) Fish.

Explanation:
Fish have been on Earth for a much longer time compared to other groups of animals. They are one of the oldest living creatures on our planet. Let's explore why fish have been on Earth the longest:

1. Evolutionary History:
Fish have a long evolutionary history, dating back over 500 million years. They evolved during the Paleozoic Era, specifically in the Silurian period. During this time, the Earth's oceans were teeming with various species of fish, and they played a crucial role in shaping the marine ecosystem.

2. Fossil Evidence:
Fossil records provide evidence of the existence of fish dating back to the early Paleozoic Era. These fossils show the presence of various types of fish, including jawless fish, armored fish, and primitive bony fish. Some of these ancient fish species are now extinct, but their descendants continue to thrive today.

3. Adaptations to Aquatic Environments:
Fish are well-adapted to live in aquatic environments, such as oceans, rivers, and lakes. Over millions of years, they have developed specialized features like gills for breathing underwater, streamlined bodies for efficient swimming, and fins for maneuverability. These adaptations have allowed them to survive and thrive in diverse aquatic habitats.

4. Diverse Species:
There is a remarkable diversity of fish species on Earth, with over 33,000 known species. They come in various shapes, sizes, and colors, and inhabit a wide range of aquatic ecosystems, from the deep sea to freshwater rivers and even brackish estuaries. This diversity suggests that fish have successfully colonized and adapted to different environments over millions of years.

5. Role in Ecosystems:
Fish play a vital role in ecosystems as both predator and prey. They help maintain the balance of aquatic food chains by controlling populations of smaller organisms and serving as a food source for larger predators. Their presence is crucial for the overall health and stability of aquatic ecosystems.

In conclusion, fish have been on Earth the longest due to their long evolutionary history, fossil evidence dating back millions of years, adaptations to aquatic environments, diverse species, and their important role in ecosystems. They have survived and thrived for millions of years, making them one of the oldest groups of animals on our planet.

Answer:

I am a Water Holding Frog.

Explanation:

Water Holding Frog is a common species of frog found in Australia. It is known for its unique ability to store water in its body which helps it to survive in dry conditions. Here are some characteristics of Water Holding Frog mentioned in the riddle:

Swimming in swamps: Water Holding Frog is an excellent swimmer and can be found in various wetlands, including swamps.

Bloating cheeks: Water Holding Frog can inflate its body with air, which helps it to float and remain buoyant in water.

Diving in dams: Water Holding Frog is known to dive into dams and other water bodies to escape predators.

Croaking in creeks: Water Holding Frog is known for its loud and distinctive croaking, which can be heard in creeks and other water bodies.

So, the correct answer to the riddle is Water Holding Frog.

Elephants have large ears that help them stay cool by allowing heat to escape from their bodies, a vital adaptation for survival in hot climates.

Understanding Sleep Patterns in Animals
When examining the sleep habits of various animals, sloths stand out as the champions of sleep. Here’s a detailed look at why sloths sleep the most.
Sleep Duration of Sloths
- Sloths are known for their incredibly long sleep hours, averaging between 15 to 20 hours a day.
- Their slow metabolism and energy conservation needs drive this extensive sleep duration.
Comparison with Other Animals
- Cows: Cows typically sleep for about 4 hours a day. They spend a significant amount of time chewing cud and grazing, which limits their sleep.
- Horses: Horses can sleep around 3 hours a day. They are prey animals and have developed a unique ability to sleep standing up, but they still need to lie down for REM sleep.
- Cats: Domestic cats are known to sleep for approximately 12 to 16 hours a day. They are crepuscular, meaning they are most active during dawn and dusk, leading to longer sleep periods during the day.
Reasons for Sloths' Unique Sleep Habits
- Energy Conservation: Sloths are herbivores with a low-energy diet, primarily consisting of leaves, which provides limited energy. Sleeping helps conserve energy.
- Predator Avoidance: Their slow movements and long sleep hours help them avoid detection by predators, making them less vulnerable in their natural habitat.
Conclusion
In summary, sloths are the animals with the longest sleep duration, surpassing cows, horses, and cats. Their unique adaptations to their environment and dietary needs contribute to their extensive sleeping habits.

Understanding Animal X
Animal X is described as an organism that consumes plant parts, gives birth to young ones, and feeds them with milk. Let's analyze the options provided to identify the correct answer.
Option A: Fox
- Foxes are omnivores.
- They mainly eat small mammals, birds, and fruits, not primarily plant parts.
- They do not exclusively give milk to their young, as they are not herbivorous.
Option B: Goat
- Goats are herbivores, which means they primarily consume plant materials like grass, leaves, and shrubs.
- They give birth to live young, known as kids.
- Female goats produce milk that they use to feed their young, making them a perfect match for the description of Animal X.
Option C: Tiger
- Tigers are carnivores.
- They primarily hunt and eat other animals, not plant parts.
- They do give birth to young, but do not feed them with milk in the context of plant consumption.
Option D: Lion
- Lions are also carnivores.
- They typically hunt for prey and do not eat plant parts.
- Like tigers, they give birth to young but do not align with the criteria of consuming plants.
Conclusion
Given the characteristics of Animal X, the only suitable option is B) Goat. Goats are herbivores that fit all the criteria: they eat plant parts, give live birth, and nurse their young with milk. This makes them the correct answer in this context.

Polar Bear Body Covering
Polar bears have a specialized body covering that enables them to thrive in extremely cold environments. The correct answer to the question is option 'B', fur.
Why Fur?
- Insulation: Polar bear fur consists of two layers. The outer layer is long, guard hairs that repel water and wind, while the inner layer is shorter, dense fur that provides excellent insulation. This double-layer system keeps the bear warm even in freezing temperatures.
- Color and Camouflage: The fur appears white or yellowish, which helps polar bears blend into their icy surroundings. This camouflage is crucial for hunting seals, their primary prey, as it allows them to approach without being easily seen.
- Water Resistance: The fur is also water-resistant. When polar bears swim in icy waters, the guard hairs trap air, providing buoyancy and keeping them dry and warm when they come out of the water.
Adaptation to Environment
- Fat Layer: Beneath their fur, polar bears have a thick layer of fat or blubber that adds extra insulation. This layer can be up to 4-5 inches thick and serves as an energy reserve.
- Behavioral Adaptations: In addition to their fur, polar bears engage in behaviors such as rolling in the snow to keep their fur clean and insulated.
In conclusion, the fur of polar bears is a remarkable adaptation that plays a critical role in their survival in the harsh Arctic climate.

Fish breathe through gills, which extract oxygen from the water. This is essential for their survival in aquatic environments.

Spiracles are small openings on an insect’s body that allow air to enter the tracheal system, helping them breathe.

Butterflies use a proboscis, a long, thin tube-like structure, to suck nectar from flowers, which provides them with nourishment.

Fish have overlapping scales that protect their bodies from water and help them move efficiently through it.

Understanding Aquatic Adaptations
Aquatic animals have developed various adaptations that help them thrive in water. However, not all adaptations are directly related to movement. Let's break down the options given:
Streamlined Body (A)
- A streamlined body shape reduces water resistance, allowing aquatic animals to swim more efficiently. This adaptation is crucial for rapid movement and agility in the water.
Breathing Tubes (B)
- Breathing tubes are not primarily for movement. They help animals breathe while submerged but do not contribute to their ability to swim.
Webbed Feet (C)
- Webbed feet increase surface area, helping animals like ducks and frogs paddle through water effectively. This adaptation enhances propulsion, thus aiding in movement.
Gills (D)
- Gills are essential for respiration in aquatic environments. They allow fish to extract oxygen from water but do not assist in locomotion.
Fins (E)
- Fins are critical for movement in aquatic animals. They provide stability and thrust, allowing fish and other aquatic creatures to navigate through water.
Conclusion
Given the breakdown above, the adaptations that help aquatic animals move easily in water are:
- A: Streamlined body
- C: Webbed feet
- E: Fins
Therefore, the correct answer is option 'B', which includes only A, C, and E. Breathing tubes and gills, while vital for survival, do not aid in movement through water.

Eagles and tigers are carnivores, meaning they feed on other animals. Eagles use their sharp beaks, while tigers have pointed teeth for tearing flesh.

Amphibians, like frogs, live both on land and in water. They have special adaptations such as breathing through their lungs on land and through their skin in water.

Camouflage helps animals blend into their surroundings, making it difficult for predators or prey to spot them, increasing their chances of survival.