Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following organisms primarily uses simple diffusion over their entire body surface for the exchange of O2 and CO2?
As per the NCERT text, 'Lower invertebrates like sponges, coelenterates, flatworms, etc., exchange O2 with CO2 by simple diffusion over their entire body surface.'
Which set of organs is responsible for respiration in amphibians through 'cutaneous respiration'?
The NCERT states, 'Amphibians like frogs can respire through their moist skin (cutaneous respiration) also.' Additionally, for frogs, 'On land, the buccal cavity, skin and lungs act as the respiratory organs.' This implies a dynamic use of different organs depending on the environment.
The conducting part of the human respiratory system consists of structures from the external nostrils up to what point?
According to the NCERT text, 'The part starting with the external nostrils up to the terminal bronchioles constitute the conducting part...'
Which of the following is NOT a function of the conducting part of the respiratory system?
The NCERT states, 'The conducting part transports the atmospheric air to the alveoli, clears it from foreign particles, humidifies and also brings the air to body temperature.' The 'Exchange part is the site of actual diffusion of O2 and CO2 between blood and atmospheric air.'
The thoracic chamber is formed dorsally by the vertebral column, ventrally by the sternum, laterally by the ribs, and on the lower side by which structure?
The NCERT text mentions, 'The thoracic chamber is formed dorsally by the vertebral column, ventrally by the sternum, laterally by the ribs and on the lower side by the dome-shaped diaphragm.'
Inspiration occurs when the intra-pulmonary pressure becomes:
The NCERT states, 'Inspiration can occur if the pressure within the lungs (intra-pulmonary pressure) is less than the atmospheric pressure, i.e., there is a negative pressure in the lungs with respect to atmospheric pressure.'
What is the approximate volume of air remaining in the lungs even after a forcible expiration?
The NCERT defines Residual Volume (RV) as 'Volume of air remaining in the lungs even after a forcible expiration. This averages 1100 mL to 1200 mL.'
Inspiratory Capacity (IC) is the total volume of air a person can inspire after a normal expiration. It includes:
As per the NCERT, 'Inspiratory Capacity (IC): Total volume of air a person can inspire after a normal expiration. This includes tidal volume and inspiratory reserve volume (TV+IRV).'
Which of the following factors is LEAST important for the rate of diffusion of O2 and CO2 across the alveolar membrane?
The NCERT states, 'O2 and CO2 are exchanged in these sites by simple diffusion mainly based on pressure/concentration gradient. Solubility of the gases as well as the thickness of the membranes involved in diffusion are also some important factors that can affect the rate of diffusion.' While blood volume is crucial for transport, the question asks about factors affecting the rate of diffusion across the membrane itself.
What is the main reason for the much higher diffusion rate of CO2 compared to O2 across the diffusion membrane per unit difference in partial pressure?
The NCERT clearly states, 'As the solubility of CO2 is 20-25 times higher than that of O2, the amount of CO2 that can diffuse through the diffusion membrane per unit difference in partial pressure is much higher compared to that of O2.'
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.