Question

Paired fins of fishes are
A. Caudal and ventral
B. Dorsal and ventral
C. Pectoral and pelvic
D. Caudal and pectoral

Answer 1

Hint: Fish belongs to class osteichthyes. It includes marine and freshwater fishes with body endoskeleton. Their body is streamlined and their mouth is terminal. They have four pairs of skin which are covered by an operculum on each side. Air bladder is present to regulate buoyancy.

Complete answer:
- Fish are gill-bearing aquatic animals that lack limbs with digits.
- Fish are abundant in most bodies of water.
- They can be found in nearly all aquatic environments, from high mountain streams to the abyssal and even hadal depths of the deepest oceans.
- Fish are an important resource for humans worldwide, especially as food.
- Commercial and subsistence fishers hunt fish in wild fisheries or farm them in ponds or in cages in the ocean (in aquaculture).
- They are also caught by recreational fishers, kept as pets, raised by fish keepers, and exhibited in public aquaria.
 -Fish have had a role in culture through the ages, serving as deities, religious symbols, and as the subjects of art, books and movies.
- Most fish are cold-blooded allowing their body temperatures to vary as ambient temperatures change, though some of the large active swimmers like white shark and tuna can hold a higher core temperature.

Various kinds of fins found in fishes are:
- Pectoral fins: These are two in number and hence, are paired. These fins are called fish's arms and are located on each side of the body of the fish.
- Pelvic fins: These fins are also called ventral fins and are paired. These are generally located behind the pectoral fins.
- Dorsal fins: These are single and located at the back of the body of fish.
- Caudal fins: These fins are the tail fins and maybe homocercal or heterocercal.

Hence, The correct answer is option (C).

Note: Class Chondrichthyes: They are marine animals having streamlined body and endoskeleton is made up of cartilage. Mouth is ventrically located. Notochord is persistent throughout life. Their jaws are very powerful and are precious. Due to the absence of an air bladder they have to swim continuously to avoid sinking.