Question

Complete the pair
Use of organs: (a) Disuse of organs (b)
(Ostrich wings / legs of swan / human nostrils)
A. (a) Human nostrils, (b) Legs of swan
B. (a) Ostrich wings, (b) Human nostrils
C. (a) legs of swan, (b) Ostrich wings
D. (a) human nostrils, (b) Ostrich wings

Answer 1

An organ system is a collection of organs working together to perform one or more roles as a biological system. In the body, each organ does a specific job, and is made up of different tissues.

Complete Answer:
- The two openings, called nostrils, or napes, in nose treatment. They lead to a wall of cartilage, two nasal cavities that are separated by the septum. A complex system of canals and pockets of air called sinus cavities is within the face. Within the cheekbones and between the eyes and brows, sinus cavities extend all the way to the back of the skull, just above the oral cavity. Many of these areas are responsible for breathing, hearing, tasting and the protection of the immune system , at least in part.
- Ostriches, emus, rheas, cassowaries, and kiwis are unable to fly. Unlike other birds, the keel that anchors the powerful pectoral muscles necessary for flight is missing from their flat breastbones.
- It's not likely that their puny wings would lift their heavy bodies off the ground. These flightless birds, known as ratites, differ clearly from other species of avian animals.The giant flightless birds are apparently helped to run by Ostrich wings, explaining the puzzling mystery of why ancient dinosaurs grew feathered limbs before flight grew.
- Swans extend one of their legs when swimming and they'll tuck it up on their back instead of putting it in the water.
- It has been proposed that this behaviour may play a role in helping to maintain the bird's body temperature. The only part of the swan that is not covered by feathers is the legs and feet, since the blood vessels are in closer contact with the air.

The correct answer is option (D) (a) Human nostrils (b) Ostrich wings.

Note: The flightless ostrich is the largest bird in the world. They wander desert lands and African savanna and get most of their water from the plants they consume.
Though they can't fly, they are fleet ostriches, good runners. They can sprint up to 43 miles an hour and run 31 miles an hour over a distance.