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Which one of the following categories of animals, is correctly described with no single exception in it?
Option: 1
All bony fishes have four pairs of gills and an operculum on each side.
Option: 2
. All sponges are marine and have collared cells.
Option: 3
All mammals are viviparous and posses diaphragm for breathing
Option: 4
All reptiles possess scales, have a three chambered heart and are cold blooded (poikilothermic)
Answers (1)
Class Osteichthyes - Characteristics Features -
- These fishes have a bony skeleton.
- They have a large mouth with movable jaws.
- Their body is covered with cycloid or ctenoid scales. These scales are impermeable to water.
- The gill slits are covered with an operculum.
- They have a closed circulatory system with two-chambered heart having one atrium and one ventricle.
- They possess air bladder or swim bladder that maintains the buoyancy.
- They have defined lateral line system of sense organs.
- They are cold - blooded.
- They are oviparous and perform external fertilization.
-
Osteichthyes have four pairs of gills and an operculum on each side.
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