Consider the following statements regarding gaseous exchange in lower invertebrates:
I. Sponges, coelenterates, and flatworms exchange O2 with CO2 by simple diffusion over their entire body surface. II. Earthworms use a network of tracheal tubes for gas transport within their bodies. III. Insects utilize their moist cuticle for atmospheric gas exchange. IV. Lower invertebrates lack specialized respiratory organs like lungs or gills.
Statement I is correct because lower invertebrates like sponges, coelenterates, and flatworms exchange O2 with CO2 by simple diffusion over their entire body surface. Statement IV is correct as they lack specialized vascularized organs. Statement II is incorrect because earthworms use their moist cuticle, not tracheal tubes. Statement III is incorrect because insects use tracheal tubes, not moist cuticle.
Question 2 of 100
📘 CLASS XI
Analyze the following statements regarding aquatic and terrestrial respiratory structures:
I. Special vascularised structures called gills (branchial respiration) are used by most aquatic arthropods and molluscs. II. Terrestrial forms use vascularised bags called lungs (pulmonary respiration). III. Fishes use gills whereas reptiles, birds, and mammals respire through lungs. IV. Earthworms use lungs for pulmonary respiration.
Statements I, II, and III are correct: Aquatic arthropods/molluscs and fishes use gills (branchial respiration), while terrestrial forms including reptiles, birds, and mammals use lungs (pulmonary respiration). Statement IV is incorrect because earthworms use their moist cuticle for gas exchange.
Question 3 of 100
📘 CLASS XI
Regarding respiration in amphibians, consider the following statements:
I. Amphibians like frogs can respire through their moist skin (cutaneous respiration). II. Frogs can also respire using lungs (pulmonary respiration). III. Adult frogs possess gills for aquatic respiration throughout adult life. IV. Cutaneous respiration occurs by simple diffusion across moist skin.
Statements I, II, and IV are correct: Frogs can respire through moist skin (cutaneous respiration) as well as lungs. Statement III is incorrect because adult frogs use lungs and moist skin, not gills.
Question 4 of 100
📘 CLASS XI
Which of the following statements regarding cellular utilization of oxygen and catabolism are correct?
I. Oxygen is utilized by organisms to indirectly break down simple molecules like glucose, amino acids, and fatty acids to derive energy. II. Carbon dioxide (CO2), which is harmful, is released during catabolic reactions. III. O2 has to be continuously provided to cells and CO2 produced by cells has to be released out. IV. CO2 is utilized by human body cells to synthesize glucose during respiration.
Statements I, II, and III are correct: O2 is utilized to indirectly break down simple molecules (glucose, amino acids, fatty acids) to derive energy, releasing harmful CO2 that must be continuously exchanged. Statement IV is incorrect because CO2 is a harmful catabolic waste released out, not utilized to make glucose during cellular respiration.
Question 5 of 100
📘 CLASS XI
Consider the statements below regarding respiratory organ diversity:
I. Mechanisms of breathing vary among animal groups depending mainly on their habitats and levels of organisation. II. Insects have a network of tubes called tracheal tubes to transport atmospheric air within the body. III. Earthworms use branchial respiration via vascularised gills. IV. Flatworms exchange gases across their entire body surface by active transport.
Statements I and II are correct: Breathing mechanisms vary based on habitat and organization level, and insects use a network of tracheal tubes. Statement III is incorrect because earthworms use moist cuticle. Statement IV is incorrect because flatworms use simple diffusion, not active transport.
Question 6 of 100
📘 CLASS XI
Analyze the following statements regarding the definition and scope of breathing and respiration:
I. The process of exchange of O2 from the atmosphere with CO2 produced by the cells is called breathing, commonly known as respiration. II. Feeling the chest move up and down is an indication of breathing. III. Breathing involves active synthesis of glucose in the lungs. IV. CO2 produced during cellular catabolism is beneficial and stored in the thoracic cavity.
Statements I and II are correct: The exchange of atmospheric O2 with cellular CO2 is called breathing (respiration), evidenced by chest movement. Statements III and IV are incorrect because breathing is gas exchange, not glucose synthesis, and CO2 is harmful and released out, not stored.
Question 7 of 100
📘 CLASS XI
Consider the following statements regarding respiratory organs of vertebrates:
I. Fishes use gills for exchange of respiratory gases. II. Amphibians, reptiles, birds, and mammals all utilize lungs for respiration. III. Birds possess gills in addition to lungs for high-altitude flight. IV. Mammals rely exclusively on cutaneous respiration.
Statements I and II are correct: Among vertebrates, fishes use gills, while amphibians, reptiles, birds, and mammals use lungs. Statement III is incorrect because birds use lungs, not gills. Statement IV is incorrect because mammals use lungs (pulmonary respiration), not cutaneous respiration.
Question 8 of 100
📘 CLASS XI
Examine the following statements regarding respiratory adaptations in invertebrates:
I. Coelenterates exchange gases by simple diffusion over their entire body surface. II. Aquatic arthropods use vascularised bags called lungs. III. Aquatic molluscs use special vascularised structures called gills. IV. Tracheal tubes in insects connect directly to the pulmonary cavity.
Statements I and III are correct: Coelenterates use simple diffusion over their body surface, and aquatic molluscs use gills (vascularised structures). Statement II is incorrect because aquatic arthropods use gills, not lungs. Statement IV is incorrect because insects lack a pulmonary cavity and use tracheal tubes throughout the body.
Question 9 of 100
📘 CLASS XI
Which of the following statements regarding respiratory substrates and gas exchange are TRUE?
I. Simple molecules broken down during cellular catabolism include glucose, amino acids, and fatty acids. II. Energy derivation in cells directly requires continuous supply of carbon dioxide. III. Catabolic reactions in cells result in the production of carbon dioxide. IV. Oxygen is released by body tissues into the atmosphere during inspiration.
Statements I and III are correct: O2 is used to break down simple molecules (glucose, amino acids, fatty acids), releasing energy and CO2 during catabolic reactions. Statement II is incorrect because cells require continuous supply of oxygen, not CO2. Statement IV is incorrect because CO2 is released during expiration, while O2 is drawn in during inspiration.
Question 10 of 100
📘 CLASS XI
Consider the following statement combinations regarding animal respiration:
I. Cutaneous respiration is seen in frogs. II. Branchial respiration is seen in fishes. III. Pulmonary respiration is seen in terrestrial mammals. IV. Tracheal respiration is seen in earthworms.
Statements I, II, and III are correct: Frogs show cutaneous respiration, fishes show branchial respiration (gills), and terrestrial mammals show pulmonary respiration (lungs). Statement IV is incorrect because earthworms use moist cuticle, while insects use tracheal tubes.
