Respiration in Organisms Test - 2

Breathing is simply the inhalation of oxygen and exhalation of carbon dioxide, i.e. exchange of gases. So, if oxygen is to inhalation, then carbon dioxide is to exhalation.

Air that we breathe in is taken through our nose. The hair present in our nose filter off the germs, pollen, or smoke in the air that we inhale.

Smoking is injurious to health as it results in inhalation of harmful smoke and gases. These gases enter our lungs and damage them.

A is false, but R is true. Exchange of gases takes place in roots too. Roots take up air from the air spaces present between the soil particles by simple diffusion. Roots of the plant do not contain stomata which are present in leaves for exchange of gases.

Sentence A is true, but sentence B is false. Breathing rate is number of times a person breathes in a minute. A breath includes both inhalation and exhalation.

The breathing rate of humans at rest is 15-18/ min.
Irritation caused by dust particles in the nasal cavity results in sneezing.
When CO₂ is passed through lime water, it forms the white precipitate of calcium carbonate.
The spaces present between the soil particles are called air spaces.

The chest cavity is surrounded by the rib cage, while the floor is occupied by a dome-shaped muscle called diaphragm. Lungs are found in the pleural cavity.

The correct sequence of defining terms is as follows.
Spiracles - Tracheae - Trachea - Alveoli.

Spiracles are the openings outside the body of insects.
Tracheae are the network of tubes inside the body of insects.

Trachea is the tube that connects lungs to the throat.
Diffusion occurs in high efficiency in alveoli.