Animal Kingdom — Set 4
Biology · जंतु जगत · Questions 31–40 of 50
What is the common respiratory structure in scorpions and spiders?
Correct Answer: C. Book lungs
Book lungs are specialized respiratory organs found in many arachnids like scorpions and spiders. They consist of stacks of thin, leaf-like plates that allow for gas exchange. This structure is adapted for breathing air in terrestrial environments.
Which of the following animals is known as the 'Portuguese Man of War'?
Correct Answer: D. Physalia
Physalia is a colonial cnidarian that floats on the ocean surface using a gas-filled bladder. Although it looks like a single organism, it is actually a colony of specialized individuals called zooids. It is famous for its powerful and painful stinging tentacles.
The process of 'Ecdysis' refers to?
Correct Answer: B. Shedding of exoskeleton
Ecdysis, or molting, is the process by which arthropods shed their old exoskeleton to allow for growth. Since the chitinous shell is rigid, it cannot expand as the animal gets larger. A new, larger exoskeleton is formed underneath before the old one is cast off.
Which animal phylum is known as the 'Flatworms'?
Correct Answer: B. Platyhelminthes
Platyhelminthes includes animals with a dorso-ventrally flattened body, hence the name flatworms. They are mostly endoparasites found in animals including human beings. They exhibit bilateral symmetry and are triploblastic but acoelomate.
How many chambers are typically found in the heart of a fish?
Correct Answer: D. Two
Fish possess a two-chambered heart consisting of one atrium and one ventricle. This heart pumps deoxygenated blood to the gills for oxygenation in a single-loop circulatory system. In contrast, birds and mammals have a four-chambered heart.
Which of the following is a warm-blooded animal?
Correct Answer: B. Bat
Bats are mammals and therefore warm-blooded (homeothermic) animals. They maintain a stable internal body temperature regardless of external conditions. Sharks, snakes, and frogs are all cold-blooded (poikilothermic) animals.
To which phylum do 'Sponges' belong?
Correct Answer: B. Porifera
Sponges are the simplest multicellular animals and belong to the phylum Porifera. They are mostly marine and have a water-conducting canal system. Their body is supported by a skeleton made of spicules or spongin fibers.
Which class of vertebrates is characterized by having 'scales' and 'laying leathery eggs'?
Correct Answer: B. Reptilia
The correct answer is 'Reptilia'. Reptiles are characterized by dry, scaly skin and the production of amniotic eggs with leathery shells. This allows them to reproduce on land without needing a water source. Snakes, lizards, and turtles are well-known examples of this class.
What is the primary function of 'Malpighian tubules' in insects?
Correct Answer: A. Excretion
The correct answer is 'Excretion'. Malpighian tubules are the main excretory organs in insects and some other arthropods. They remove nitrogenous wastes from the hemolymph and empty them into the hindgut. This system is highly efficient at conserving water in terrestrial insects.
Which of the following is a 'Flightless Bird' native to New Zealand?
Correct Answer: A. Kiwi
The Kiwi is a small flightless bird that is a national symbol of New Zealand. It has tiny, useless wings and a long beak with nostrils at the tip for sensing food. Unlike most birds, it has a very keen sense of smell.