Test: Respiration in Organisms - Class 7 MCQ

The heart is a muscular organ responsible for pumping blood, not for respiration.

Oxygen is necessary for cellular respiration, which produces energy for the body's cells.

Hemoglobin is a protein found in red blood cells that binds to oxygen and allows it to be transported throughout the body.

During photosynthesis, plants use energy from sunlight to convert carbon dioxide and water into glucose and oxygen.

Roots are responsible for absorbing water and nutrients from the soil, not for respiration.

Aerobic respiration occurs in the presence of oxygen, while anaerobic respiration occurs in the absence of oxygen.

During intense exercise, the body may rely on anaerobic respiration to produce energy in the absence of sufficient oxygen.

The diaphragm is a muscle located at the bottom of the rib cage that helps to expand and contract the lungs during breathing.

The esophagus is part of the digestive system, not the respiratory system.

Cilia are tiny hair-like structures that line the respiratory tract and help to move mucus and foreign particles out of the airways.

Parkinson's disease is a neurological disorder that affects movement and coordination, not the respiratory system.

Smoking is the primary cause of emphysema, a condition in which the air sacs in the lungs become damaged and lose their elasticity.

Asthma is a respiratory condition that can cause difficulty breathing, wheezing, and coughing.

Plants respire through small pores called stomata on the surface of their leaves.

During aerobic respiration, glucose is broken down in the presence of oxygen to produce carbon dioxide, water, and energy.

Fish breathe by drawing water over their gills, which extract oxygen from the water and release carbon dioxide.

Mitochondria are organelles found in cells that are responsible for producing energy through cellular respiration.

Weightlifting is not an example of aerobic exercise, but running, swimming, and cycling are: 

• Aerobic exercise

  This type of exercise is performed for a sustained period and includes activities like running, swimming, cycling, walking, hiking, dancing, and playing sports. Aerobic exercise can help improve heart and lung function, increase circulation, and reduce blood pressure, cholesterol, and inflammation. 

• Anaerobic exercise

  This type of exercise involves short bursts of intense activity and does not require oxygen. Examples of anaerobic exercise include weightlifting, sprinting, and climbing stairs. 

Tidal volume and vital capacity are both measures of lung capacity, but they refer to different aspects of breathing.

While aerobic exercise can help to improve muscle tone and endurance, it is not typically associated with significant increases in muscle mass.