Biology Chapter 13 – Gaseous Exchange (Class 11) for FSC & Entry Test Preparation
Chapter 13, Gaseous Exchange, is an important topic for Class 11 students preparing for FSC board exams and medical/engineering entry tests like MDCAT, NUMS, AKU, NUST, ECAT, and UET. This chapter explains how living organisms exchange gases with their environment to maintain respiration and support life processes. Understanding gaseous exchange is essential for grasping respiratory mechanisms and oxygen-carbon dioxide transport in animals and plants.
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Pharynx leads air into _____ through glottis.
NTS 2012
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When abdomen expands, the number of spiracles open is
Which of the following is the respiratory surface in human beings?
PMC Practice 3
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The infection of lungs is called:
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There are ______ stomata per square cm of leaf surface in Tobacco plants.
In most birds air sacs are _____ in number
Which of the following correctly explains the structure of myoglobin:
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Diaphragm is a sheet of:
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Lungs are spongy due to the presence of million of
Of the following, which one is better respiratory medium.
Water is _____ times viscous than air
Functional units of lungs are called
Guard cells function as:
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Which of the following is not an infection of the lungs/respiratory tract?
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Oxygen contents per liter of air is
Vocal cords, which help in voice production are two thin edged fibrous bands, present in:
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The air spaces may comprise upto ______ of total volume of leaf surface.
Gaseous exchange in plants takes place through the:
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The maximum amount of oxygen which normal human blood absorbs and carries at sea level is how many ml per 100 ml of blood?
PMC Sample 2
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Active site of Rubisco is evolved to bind
During inspiration, the diaphragm:
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The glycolate produced diffuses into the membrane bounded organelles called
As pH of blood decreases, H+ ions increases, which combine the proteins part of hemoglobin, to decrease its ability to bind with:
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Haemoglobin carries more oxygen than plasma by:
NTS 2011
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The number of stomata present per cm2 of leaf is:
PMC Sample 2
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As pH of blood decreases, H+ ions increases, which combine the proteins part of hemoglobin, to decrease its ability to bind with:
NUMS 2017
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______ respiration is the process by which cell utilized oxygen and produces CO2
Parabronchi are open at ______ end/s
Oxygen, released into the atmosphere, comes from:
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Number of spiracles present in cockroach is
The irritant substances of smoke cause smoker’s cough which weakened and bursts:
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In which of the following are book lungs found?
NUMS 2014
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Which one of the following is a genetic disorder in which abnormally thick mucus is produced in the lungs and other parts of the body?
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Booklungs serve the function of respiration in:
NTS 2014
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Chest cavity is bounded by ribs and muscles on the sides, while the floor of chest cavity is called:
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During inspiration, the space inside the chest cavity is increased due to:
UHS 2019
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Lungs are covered with double layered thin membranous sac called
The voice box leads to the trachea which is also called
PMC Practice 1
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Vocal cords are stretched across
The most important cause of many of the respiratory disorders is:
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Hemoglobin can absorb maximum oxygen at sea level, which is _____ ml/100 ml of blood.
NUMS 2019 Cancelled
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The function of respiratory passage, Cilia is to keep the airways clear of:
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Chest cavity is bounded by ribs and muscles on the sides, while the floor of chest cavity is called:
NUMS 2015
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Thick, waxy & leathery cuticle around leaves is present in which of the following?
PMC Sample 2
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The respiratory pigment, which has much higher affinity to combine with oxygen is:
NUMS 2016
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Number of spiracles present in the thorax of cockroach is
The passageways of the respiratory system mucous secreting cells called:
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Most oxygen is transported in the blood:
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Xerophytes have small thick leaves to;
UHS 2019
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Smaller the animals:
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Nicotine in tobacco:
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The gas-exchange portion of the human respiratory system is the:
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A disease caused by gradual breakdown of the thin walls of alveoli is;
UHS 2019
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_________ respiration is directly involved in the production of energy, necessary for all living activities.
The oxygen-binding protein present in skeletal muscles is:
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The structural and functional unit of the lungs is:
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Breathing is considered as a:
PMC Practice 1
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During breathing air from Pharynx enters to:
UHS 2018
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Carbon dioxide is carried in the blood, mainly as:
NUMS 2015
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Four plants are present in different environmental conditions. Plant A is present in a warm climate with continuous rainfall, plant B is present in a cool forest, plant C is present in a warm climate with little breeze, while plant D is present in a warm climate with high wind speed. Which one of the above plants will have the highest rate of transpiration?
UHS 2019
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Oxygen is transported by combining with ……….. in Hb.
NUMS 2015
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Lungs are separated from abdominal cavity by a muscular sheath called:
NUMS 2018
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The blood enters the _____ side of heart
Gaseous exchange through the skin is known as ______ respiration.
Key Concepts about Gaseous Exchange
The chapter explains the mechanisms of gaseous exchange in different organisms, including unicellular, aquatic, and terrestrial animals, as well as plants. It covers respiratory structures such as gills, tracheae, lungs, and stomata, and describes the process of diffusion and transport of oxygen and carbon dioxide in the blood. The chapter also discusses respiratory pigments, ventilation, and factors affecting respiration. Each concept is explained with examples, structural details, and significance in maintaining homeostasis. These concepts are highly important for FSC board exams and entry tests like MDCAT, NUMS, AKU, and NUST.
Free Entry Test Preparation
Mastery of gaseous exchange helps students understand respiration, oxygen transport, and the physiology of different organisms. PLS Academy provides practice questions, solved past papers, and chapter-wise MCQs to help students revise these topics effectively. Regular study of this chapter improves problem-solving skills, conceptual clarity, and exam performance, ensuring students are well-prepared for both board exams and competitive entry tests.
JazakAllah.
