Biology

Respiration and Gas Exchange

989 Questions

Access a targeted set of questions on respiration and gas exchange for competitive exams. Topics include lung volumes, the mechanism of breathing, and respiratory anatomy. Understanding these physiological processes is essential for scoring well.

Lung volumes and capacitiesBreathing mechanismsRespiratory anatomyGas exchange processes

Respiration and Gas Exchange Questions

Multiple choice biology human system gas exchange and smoking gas exchange gas exchange in humans

Respiration is the physiological process in which

  1. Breathing occurs

  2. Breathing and external respiration occurs

  3. Breathing, external respiration and cellular respiration occurs

  4. Only inspiration occurs
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Physiological respiration is the complete process of respiration which includes physical and biochemical pathway. In physical pathway, there is an exchange of gasses that takes place with the help of respiratory organ i.e., lungs. In biochemical pathway, cells are involved where oxidation of food i.e. glucose takes place in mitochondria and cytoplasm in the presence of several respiratory enzymes. 

So, the correct answer is option C.

Multiple choice chemistry substances in the surroundings - their states and properties measurement of density properties of substances fundamental and derived units

Ventilators are provided at the top of room

  1. To bring oxygen for breathing

  2. So that sunlight may enter the room

  3. To maintain convectional currents to keep the air fresh in the room

  4. To provide an outlet for carbon dioxide
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ventilators are provided in the rooms at the top of the roofs because if the air inside the room gets hot, the hot air rises up and flows through these ventilators and thus cool air remains at bottom. It brings cool and fresh air in the room. Thus ventilators maintain conventional currents to keep the air fresh in the room.

Multiple choice bio-chemistry digestion digestive system - organs process of digestion coordination in the process of digestion

A flap-like muscular valve controls the movement of air and food is ..........

  1. Nostrils

  2. Uvula

  3. Epiglottis

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The epiglottis is a leaf-shaped flap-like muscular valve made up of cartilage. It is located behind the tongue. The function of epiglottis is to prevent the entry of food in the windpipe and it seal off windpipe during eating.
So, the correct answer is 'Epiglottis'.
Multiple choice bio-chemistry digestion digestive system - organs process of digestion coordination in the process of digestion

Why can a person not swallow food and talk at the same time?

  1. The brain cannot control two activities at the same time.

  2. In order to speak, air must come through the pharynx to form sounds.

  3. In order to swallow, the epiglottis must close off the larynx (trachea).

  4. Both B and C are correct.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Speaking requires air to pass through the larynx, while swallowing requires the epiglottis to close off the larynx to protect the airway. These two actions are mechanically incompatible.

Multiple choice biology respiration in plants fermentation cell respiration living organisms and energy production

Sometimes, higher plants and animals too perform anaerobic respiration.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

(i). Respiration is an energy yielding process and takes place by the oxidation of foodstuffs.
(ii) Higher plants and animals require oxygen in order to respire aerobically.
(iii) However, in conditions where oxygen is depleted, these organisms perform anaerobic respiration to obtain energy.

(iv). Glucose is incompletely oxidized and a comparatively lesser amount of energy is obtained through anaerobic respiration. The anaerobic respiration mainly takes place during strenuous exercise when there is shortage of oxygen, which leads to production of lactic acid in muscles.

Multiple choice

Why doe aerobic sports generally condition the heart muscle faster than anaerobic ones?

  1. the heart is not exercised during anaerobic sports

  2. muscle cells needs more oxygen during aerobic sports

  3. some muscle cells do not use anaerobic respiration

  4. anaerobic sports require more rapid breathing
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Aerobic sports require sustained oxygen delivery to working muscles, which strengthens the heart and improves cardiovascular conditioning. Anaerobic sports also exercise the heart, but aerobic activities provide more continuous cardiovascular stress. Option A is incorrect because anaerobic sports do exercise the heart.

Multiple choice

Where is the diaphragm located?

  1. below the heart

  2. on each side of the bronchi

  3. at the top of the left lung

  4. below the lungs
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The diaphragm is a large, dome-shaped muscle located at the base of the thoracic cavity, directly below the lungs, which facilitates breathing.

Multiple choice

Which of these correctly maps the flow of air entering the body?

  1. nose - larynx - pharynx - bronchi - trachea - lungs

  2. nose - bronchi - pharynx - larynx - trachea - lungs

  3. nose - pharynx - trachea - larynx - bronchi - lungs

  4. nose - pharynx - larynx - trachea - bronchi - lungs
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Air enters through the nose, passes through the pharynx and larynx, travels down the trachea, branches into the bronchi, and finally reaches the lungs.

Multiple choice

Why does a plant's roots need oxygen to help the plant grow?

  1. to gather water & nutrients from the soil

  2. to synthesize carbon dioxide

  3. to oxygenate the chlorophyll

  4. to help absorb the Sun's energy
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Roots require oxygen for cellular respiration, which provides the energy necessary for active transport. This energy is used to absorb water and mineral nutrients from the soil.