Science 1 Marks Question

Yes, the roots which are underground also take in oxygen from the air spaces found between the soil particles.

No, these animals do not have lungs.

A person can hold a maximum of 6 litres of air in the lungs.

During physical activity, food gets broken down at a faster rate to supply energy. Therefore, we feel hungry.

Yes

On an average, an adult human being at rest breathes in and out 15 to 18 times in a minute.

Oxygen present in air is essential for aerobic respiration. It breaks down food and releases energy during respiration.

(i) Yes
(ii) No, the lungs expand during inhalation.
(iii) No, the diaphragm moves up during exhalation.

Process of respiration yields energy which is required to perform a variety of routine activities. Thus, it needs to be a continuous process.

The farmers sometimes loosen the soil. This helps the roots to respire through the air present in the space between soil particles.

Frogs respire through their moist skin in water as well as through a pair of lungs on land.

Insects possess special organ called spiracles for respiration.

Our nostrils possess hairs and mucous lining. These help in preventing dirt, dust and germs from entering our respiratory system.

During the process of inhalation, diaphragm contracts and moves downwards.

No, different organisms respire at different rate because they all perform different activities at all times.

The breathing rate increases during exercise and decreases when we go to sleep.

Anaerobes respire using anaerobic mode. Yeast is an organism that respire anaerobically.

The process of breakdown of food in the cell with the release of energy is called cellular respiration.

We often sneeze after inhaling dust-laden air because it helps to remove the irritating foreign particles from the nasal passage.

Three organs that help in cellular respiration are the lungs, heart, and blood vessels.

The rate of respiration is the number of breaths taken per minute.

Exhalation is the process of breathing out air from the lungs.