Olympiad Test: Animals - 1 - Class 5 MCQ

A habitat is the place where an animal lives, and it provides everything the animal needs to survive—food, water, shelter, and space. This natural environment helps animals meet their needs to grow, reproduce, and stay healthy. For example, a forest is a habitat for many animals, providing them with trees for shelter and food from plants or other animals. So, habitat is not just a place, but a home that supports life.

An ecosystem is a system where living organisms (like plants, animals, and microbes) interact with each other and with the non-living parts of their environment (like water, air, and soil). These interactions help the ecosystem function as a whole. For example, in a forest, plants provide oxygen and food for animals, while animals help in pollination and seed spreading. The ecosystem includes both living and non-living components working together.

Invertebrates are animals without a backbone, and they make up about 90 percent of the animal world. This category includes animals like insects, worms, and jellyfish. Most animals on Earth are invertebrates, and they live in various habitats, from the oceans to forests and deserts.

Fish have been on Earth the longest. They appeared over 500 million years ago, long before mammals, birds, or whales. Fish are considered one of the oldest groups of vertebrates, and they continue to thrive in oceans, rivers, and lakes around the world.

Other Groups

• Birds: Evolved from reptiles, specifically theropod dinosaurs, around 150 million years ago.
• Mammals: Evolved from synapsid reptiles around 200 million years ago.
• Whales: Evolved from land-dwelling mammals around 50 million years ago.

Grasshoppers can camouflage themselves in the grass. Their green or brown color helps them blend into their surroundings, making it harder for predators to spot them. This adaptation helps them hide and avoid being eaten by animals like birds.

A streamlined body, webbed feet, and fins help aquatic animals move easily in water. A streamlined body reduces water resistance, webbed feet and fins help in swimming efficiently. While gills help in breathing, they don’t directly assist in movement. Breathing tubes are not typically used by aquatic animals for movement.

The Green and Golden Bell Frog is known for living in swamps, diving in water bodies like dams, and croaking in creeks. It also has the ability to bloat its cheeks, which fits the description. The Water Holding Frog is more focused on survival in dry conditions, so the Green and Golden Bell Frog is the better match for this riddle.

A baby frog (tadpole) breathes through its gills in water, but as it matures into an adult frog, it develops lungs and starts breathing on land. This transformation from gills to lungs is a key characteristic of frogs.

A goat is an herbivorous animal that eats plant parts. Like all mammals, it gives birth to young ones and feeds them milk. This matches the description provided for animal 'X'.

The sloth has the longest sleep hours among animals. It can sleep for up to 20 hours a day. Sloths are known for their slow movements and spend most of their time resting in trees.