Olympiad Test: Animals - 1 - Class 6 MCQ

Camouflage is a crucial adaptation that allows grasshoppers to protect themselves from predators. This ability to blend into their environment is achieved through several steps:

1. Understanding Camouflage: Camouflage refers to the strategies that animals employ to avoid detection by predators or to ambush prey. In the case of grasshoppers, their green coloration allows them to merge seamlessly with grassy environments, making them less visible

2. Mechanism of Camouflage: Grasshoppers possess a body color that closely resembles the shades of grass. This adaptation is a result of evolutionary processes that favor individuals who can evade predators more effectively. The green coloration acts as a natural shield against visual detection

3. Behavioral Aspects: In addition to their physical appearance, grasshoppers may also engage in specific behaviors that enhance their camouflage. For instance, they often remain still or move slowly, further reducing the likelihood of being spotted by predators

4. Comparison with Other Options: While the other options, such as having a poisonous sting or releasing a pungent smell, may serve as defensive mechanisms in some species, grasshoppers do not exhibit these traits. They do not breathe in water, which is irrelevant to their survival strategy on land

In summary, the ability of grasshoppers to camouflage themselves in grass is a vital adaptation that significantly enhances their chances of survival against predators

Snakes and worms do not have legs. Snakes move by slithering, using their muscles and scales to push against the ground. Worms move by contracting and extending their bodies in a wave-like motion, using tiny bristles called setae for grip. Therefore, the statement "A snake and a worm use their legs to crawl on the ground" is incorrect.

Option A, B, and C are true:

• Lizards can shed their tail to distract predators.
• Grasshoppers have powerful hind legs for quick hopping.
• Crocodiles, lizards, and turtles use their legs for crawling on the ground.

Earthworms and frogs are examples of animals that breathe through their moist skin.

• Earthworms (P) use their skin for respiration, as they do not have lungs, and the moisture helps in the exchange of gases.
• Frogs (Q) also breathe through their skin, particularly when they are in water, as well as through their lungs.
• R is another organism, assumed to be an amphibian like a frog or a similar species that can breathe through moist skin.

Thus, the correct option is C (Only Q and R).

The bat does not belong to the same group of animals as the other three living things because it does not have feathers.

• Bats are mammals, and they have fur, not feathers.
• The other animals, which are likely birds, have feathers and are classified as avians, while bats are part of the mammal group.
• While bats can fly, hunt at night, and some are carnivores, these characteristics do not separate them from birds in the same way that the absence of feathers does.

The given animals in the pictures are penguin, turtle and sea lion. Their similarities are:
i. They have flippers to help them move in the water.
ii. They can live both on land and in water.
iii. They have lungs to breathe in oxygen.

Webbed feet is an adaptation in aquatic birds.

• Aquatic birds, like ducks, swans, and geese, have webbed feet that help them swim efficiently by acting like paddles in water.
• Aerial birds (Option A) have feet adapted for perching, not swimming.
• Reptilian birds (Option B) is not a correct category, as birds are not classified as reptiles.
• The ostrich (Option D) is a flightless bird with strong legs adapted for running, not webbed feet for swimming.

The animal that Anish saw is a fish. Fish are aquatic animals that spend their entire life in water, have tails for swimming, and cannot live without water. The outer covering of fish is typically scales, which help protect them and reduce water resistance while swimming.

The bird and the bat are similar because both have wings.

• Birds have wings that are adapted for flight, with feathers covering them.
• Bats, which are mammals, have wings too, but their wings are modified from their forelimbs and are covered by a thin membrane of skin, not feathers.

While both animals can fly, the structure of their wings is different, but they share the common trait of having wings.

Birds that swim in water typically have webbed feet.

• Webbed feet act like paddles, helping these birds swim efficiently in water. Examples of such birds include ducks, swans, and geese.
• Clawed feet (Option B) are more common in birds that need to grip or hold onto things, such as raptors.
• Long legs (Option C) are seen in birds that wade through shallow water, like herons, but not necessarily those that swim.
• Short legs (Option D) are not typically associated with swimming birds, as longer legs or webbed feet are more efficient for swimming.

The animal shown in the figure likely has gills for breathing. Prawns, which are aquatic animals, breathe in oxygen dissolved in water through their gills, just like the animal in the figure.

• Caterpillars (Option B) breathe through tiny openings in their bodies called spiracles, which lead to a network of tubes called tracheae.
• Whales (Option C) are mammals and breathe air through lungs, not gills.
• Worms (Option D), like earthworms, breathe through their moist skin rather than gills.

Thus, prawns are the correct answer, as they breathe through gills.