Test: Respiration in Organisms - Class 7 MCQ

Insect bodies have openings, called spiracles, along the thorax and abdomen. These openings connect to the tubular network, allowing oxygen to pass into the body, regulating the diffusion of CO₂ and water vapor. 

The part of breathing during which oxygen rich air is taken in is called inhalation.

During exhalation, i.e. releasing air during respiration, the ribs move downwards to reduce the volume of the thoracic cavity.
During exhalation, your diaphragm relaxes and moves upward into the chest cavity. The intercostal muscles between the ribs also relax to reduce the space in the chest cavity. As they relax they position the rib cage downwards and inwards.

Stomata are microscopic pores found on the surface of leaves and are responsible for gas exchange.
They allow plants to take in carbon dioxide and release oxygen, playing a crucial role in photosynthesis and respiration.

Gills are respiratory organs in fish. Gills intake oxygen from water.

Explanation:

• Frogs have a specialized skin that is permeable to gases, allowing them to absorb oxygen and release carbon dioxide through their skin.
• When frogs are on land, they primarily use their lungs to breathe. However, when they are in water or in damp environments, they rely more on their skin for respiration.
• This dual breathing system allows frogs to adapt to different environments and survive in a variety of conditions.

When cells break down food with the help of oxygen, it is called aerobic respiration. This is like how our bodies get energy from the food we eat by using oxygen. It helps us move, play, and do all our activities!

Yeasts are single-celled organisms. They respire anaerobically and during this process yield alcohol. In this process glucose breaks down into alcohol (ethanol) and carbon dioxide.

Athletes breathe faster and deeper after a race to supply more oxygen to their cells. During intense physical activity, the body's demand for energy is high, but the oxygen supply is limited. This leads to anaerobic respiration in muscle cells. After the race, rapid and deep breathing helps replenish the oxygen deficit. Interestingly, some athletes practice controlled breathing techniques to improve their performance and recovery.

The normal range of breathing rate per minute for an average adult at rest is typically between 12 and 18 breaths per minute. From the options you provided, the closest range is 15-18 breaths per minute.