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Biology : Taxonomy Part-I

📆 October 25, 2024

Total Questions: 50

11. Which one of the following statements is not correct? [I.A.S. (Pre) 2002]

Correct Answer: (a) All echinoderms are viviparous.
Solution:Echinoderm is the common name given to any member of the Phylum Echinodermata of marine animals. The adults are recognizable by their (usually five-point) radial symmetry and include such well-known animals as starfish, sea urchins, sand dollars and sea cucumbers. Most animals of phylum Echinodermata are oviparous and only some of them are viviparous. Oviparous animals lay eggs, with little or no other embryonic development within the mother.

12. Which one of the following creatures have no blood but respires? [Uttarakhand Lower Sub. (Pre) 2010]

Correct Answer: (a) Hydra 
Solution:Hydra has no blood but respires. In hydra both, the gaseous exchange and excretion occur by simple diffusion. Hydra are simple, aquatic animals belonging to the phylum Cnidaria. They lack a circulatory system like blood and blood vessels, making them unable to transport gases and nutrients through a network of vessels.

Oxygen diffuses directly from the surrounding water across the hydra's thin body wall and into its cells, where it is used for respiration. Carbon dioxide, a waste product of respiration, also diffuses from the cells out of the body through the body wall. Similar to respiration, nitrogenous wastes and other waste products are excreted from the hydra's body through the body wall via diffusion.

13. Of the following which one is not a fish? [Chhattisgarh P.C.S. (Pre) 2011]

Correct Answer: (a) Starfish
Solution:Starfish popularly called sea stars are related to the phylum Echinodermata while true fishes belong to the phylum Chordata. Starfish do not have gills, scales or fins which are basic characteristics of fishes.

14. Of the following, which one is a true fish? [Uttarakhand P.C.S. (Mains) 2006]

Correct Answer: (d) Catfish
Solution:Silverfish are nocturnal insects. Their abdomens taper at the end, giving them a fish-like appearance due to grayish-blue and metallic shine as they get older.
Crayfish, also known as crawfish, crawdads or mudbugs, are freshwater crustaceans resembling small lobsters to which they are related taxonomically. They are the members of the superfamilies Astacoidea.
Jellyfish is also known as Aurelia. They are classified as free-swimming marine animals consisting of a gelatinous umbrella-shaped bell.
Catfish (order Siluriformes) are a diverse group of ray-finned fish. Named for their prominent barbels which resemble a cat’s whiskers, catfish range in size and behavior.

15. Which one of the following is a true fish? [R.A.S./R.T.S. (Pre) 1997]

Correct Answer: (d) Seahorse
Solution:Starfish or Sea stars are star-shaped echinoderms belonging to the class Asteroidea. Jellyfish (Cnidaria) and Hagfish (Cyclostomata) are also not true fishes. Seahorse is the name given to 45 species of small marine fish in the genus Hippocampus which is a bony fish.

16. Which of the following is fish? [U.P. Lower Sub. (Pre) 2008]

Correct Answer: (c) Seahorse
Solution:Starfish or Sea stars are star-shaped echinoderms belonging to the class Asteroidea. Jellyfish (Cnidaria) and Hagfish (Cyclostomata) are also not true fishes. Seahorse is the name given to 45 species of small marine fish in the genus Hippocampus which is a bony fish.

17. How many bones are in Shark Fish? [Chhattisgarh P.C.S. (Pre) 2011]

Correct Answer: (b) 0
Solution:Shark Fish contains no bones in its body. Sharks and other cartilaginous fish (skates and rays) have skeletons made of cartilage and connective tissues. Cartilage is a flexible, yet strong, tissue that is also found in human ears and the tip of the nose. Cartilage is less dense than bone, which helps sharks remain lightweight and agile in the water.

The lightweight structure of the cartilaginous skeleton, combined with large, oil-rich livers, contributes to sharks' buoyancy, allowing them to float more easily. The flexibility of cartilage allows sharks to move through narrow spaces and make quick turns, crucial for hunting and maneuvering in the water.

18. Which of the following is not a bird? [I.A.S. (Pre) 2022]

Correct Answer: (a) Golden Mahseer 
Solution:Among the given options, Golden Mahseer is not a bird. It is an endangered species of cyprinid fish that is found in rapid streams, riverine pools, and lakes in the Himalayan region. Its scientific name is Tor putitora. Indian Nightjar, Spoonbill and White Ibis belong to group aves (birds).

19. Which is the largest mammal? [M.P.P.C.S. (Pre) 2010]

Correct Answer: (a) Whale 
Solution:Whales are the largest mammals ever known to have lived on earth. Whales range in size from the blue whale, the largest animal known to have ever existed at 33 m, and more than 180 tons to pygmy species such as the pygmy sperm whale at 3.5 m (11 ft).

20. From which of following groups does the whale belong— [R.A.S./R.T.S. (Pre) 1993]

Correct Answer: (b) Mammals
Solution:Whales are the largest mammals ever known to have lived on earth. Whales range in size from the blue whale, the largest animal known to have ever existed at 33 m, and more than 180 tons to pygmy species such as the pygmy sperm whale at 3.5 m (11 ft).
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