Problem 175 - Objective Biology for NEET

Question

Which fish possess poison sting? (a) Scoliodon (dog fish) (b) Trygon (c) Torpedo (d) Pristis (saw fish)

Step-by-Step Solution

Answer

The fish that possesses a poison sting among the provided choices is Trygon.

Step 1: Identify Characteristics of Scoliodon (dog fish)

Scoliodon is a species of dogfish sharks in the family Carcharhinidae. They do not have a poison sting.

Step 2: Identify Characteristics of Trygon

Trygon is a genus of rays in the family Dasyatidae. They are known for their venomous sting, so they do possess a poison sting.

Step 3: Identify Characteristics of Torpedo

Torpedo is a genus of rays in the family Torpedinidae. They are known for being electric rays, not for a poisonous sting. Therefore, they do not have a poison sting.

Step 4: Identify Characteristics of Pristis (saw fish)

Pristis is a genus of sawfish in the family Pristidae. They are known for their long, saw-like snout filled with teeth, but they do not have a poison sting.

Key Concepts

Trygon characteristics

Trygon, commonly known as stingrays, belongs to the family Dasyatidae. These fascinating creatures are a type of fish known for their flat, diamond-shaped body and a long tail that carries a venomous spine. The venom is used primarily for defense against predators, as stingrays are generally peaceful and non-aggressive.
Stingrays can be found in warm coastal waters around the globe, often swimming along the sea bottom. They have a unique method of propulsion; they "fly" through water by waving their wing-like pectoral fins.

• Diet: Stingrays primarily feed on mollusks, crustaceans, and small fish.
• Habitat: Typically found in tropical and subtropical coastal oceans.
• Behavior: Usually bury themselves in sand to ambush prey or avoid predators.

These characteristics make Trygons an intriguing subject for biologists and ocean enthusiasts alike.

venomous aquatic animals

The world of aquatic life is home to a variety of intriguing venomous animals. Venomous animals are those that inject toxins through specialized structures like fangs, stingers, or spurs. This can help them hunt or defend against threats.
Venomous aquatic species include:

• Stingrays: Known for their venomous tail spines, used defensively.
• Lionfish: These boast venomous fin spines that can be harmful to humans.
• Stonefish: Possess highly venomous spines, making them one of the most dangerous fish.

Studying venomous aquatic animals provides insights into evolutionary biology and adaptation strategies in the ocean's vast ecosystems. For example, how animals balance the need for defense with the risk of predator exposure when deploying venom.
The venom in stingrays, specifically, is a complex mixture of proteins and can cause symptoms ranging from pain to systemic effects in humans, but it's rarely fatal.

marine biology

Marine biology is the study of organisms that inhabit ocean environments, covering a broad range of topics from tiny plankton to giant whales. This field looks at the behavior, physiology, and interactions of marine life with their ecosystems.
Important aspects of marine biology include:

• Ecology: How marine species interact with each other and their environment.
• Conservation: Efforts to protect endangered marine species and habitats.
• Biotechnology: Exploration of marine organisms for new medical or technological applications.

In the study of Trygon and other venomous marine species, marine biologists might look at how these animals contribute to the health of their ecosystems, or how their venom could be used in pharmaceuticals.
By understanding the intricate web of life in the ocean, scientists can better predict changes in biodiversity and promote sustainable use of marine resources.