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Class 10 Biology Chapter 1: Gaseous Exchange MCQs With Explanations

Practice Class 10 Biology Chapter 1: Gaseous Exchange MCQs with explanations for Pakistani board exams. Includes solved objective questions, answer checking, chapter revision guidance and next chapter suggestions.

MCQs / Class 10 / Biology / Chapter 1: Gaseous Exchange
11 MCQs

Chapter 1: Gaseous Exchange Objective Preparation

Use this page for direct chapter practice, answer checking and explanation review. It is available through the clean URL shown in the browser, so students can bookmark and share this exact chapter.

11Total MCQs
11With explanations
8Topics represented

Topics found: Respiratory System, Respiratory Gases, Respiratory Diseases, Plant Stomata, Respiratory Anatomy, Breathing Control, Respiratory Structures, Breathing Rate

Gaseous Exchange MCQs With Explanations

Q1. The air passageway starts from:
The respiratory tract begins at the nose, where air enters and is filtered, warmed, and humidified before passing to the pharynx.
Q2. Amount of carbon dioxide in inspired air is:
Atmospheric CO2 concentration is approximately 0.04% (400 ppm), which is the level in inhaled air before gas exchange in the lungs.
Q3. Which disease is not related to lungs?
Myopia is a refractive eye disorder, unrelated to the respiratory system or lung function.
Q4. In most terrestrial plants, stomata are predominantly found on:
Stomata are primarily located on the lower epidermis of leaves to minimize water loss while allowing gas exchange.
Q5. What is the typical length of the adult trachea?
The adult trachea is approximately 10–12 cm long, with 12 cm being the standard accepted value in human anatomy.
Q6. For primary stimulus, breathing is controlled by the concentration of:
Central chemoreceptors in the brainstem primarily respond to changes in blood CO2 levels, which drive respiratory rate adjustments.
Q7. Which structure actively helps in taking the air out of lungs?
The diaphragm relaxes and moves upward during exhalation, decreasing thoracic volume and actively pushing air out of the lungs.
Q8. What is the approximate percentage of oxygen in expired air?
Expired air contains about 16% oxygen because the body consumes roughly 5% of the inhaled oxygen (21%), leaving the remainder exhaled.
Q9. In humans, normal breathing rate per minute:
The normal resting respiratory rate for adults is 12–20 breaths per minute; 16–20 is the most precise and commonly cited range in medical literature.
Q10. The respiratory centre is present in:
The respiratory center, which regulates breathing, is located in the medulla oblongata and pons of the brainstem.
Q11. How many carcinogens are present in cigarette smoke?
Cigarette smoke contains over 70 known carcinogens, as confirmed by the CDC and IARC, making 'Over 50' factually accurate.

After Chapter 1: Gaseous Exchange, Practice Next Chapters

Once you finish these MCQs, continue with the next available chapters from Biology so your revision stays chapter-wise and complete.

Chapter 1: Gaseous Exchange Revision Guide

Complete the MCQs first, then review every incorrect answer against the textbook heading where that concept appears. For biology and other science subjects, pay attention to terminology, diagrams, sequence of processes, examples and differences between similar structures or functions.

This chapter page keeps the exact class, subject, chapter, question count, answer checking, explanations and follow-up chapters together, so students can revise from one focused URL instead of searching through the full book again.

Class 10 Biology MCQ Preparation: Gaseous Exchange

This page supports Matric Part 2 practice in Biology. At this stage, the main purpose is strengthening final-year matric concepts and preparing for cumulative school and board assessments. The questions available here should be used with the current textbook and the instructions issued by the learner's school or examination board.

What Biology MCQs can test

In Biology, objective questions commonly draw on biological terminology, structures, functions, process sequences, classifications, examples, comparisons and labelled diagrams. A useful answer is based on the exact wording and concept, not simply on recognising a familiar option. For this subject, learners should link each structure with its function and arrange multi-stage processes in the correct biological sequence.

Gaseous Exchange: focused MCQ revision

This chapter should be reviewed through its main definitions, examples, diagrams, comparisons and links with earlier Biology concepts.

Write a one-sentence reason for each corrected answer and note the textbook heading where the concept is explained.

Common mistakes for Class 10 learners

In this subject, frequent errors include interchanging similar terms, skipping a process step, assigning a function to the wrong structure or relying on a diagram without reading its labels. Review textbook exceptions, diagrams, units and similar-looking statements because these often cause avoidable objective-question errors. When the page marks an answer as incorrect, the next step should be to identify the mistaken idea and verify it, rather than memorising the displayed answer letter.

A practical revision routine

Alternate chapter revision with short mixed tests so that older material remains active while new chapters are completed. Before attempting the MCQs, review key terms, process stages, structure-function relationships, classifications, examples, differences and diagram labels. Complete a manageable set without notes, check the result, and divide errors into missing knowledge, misunderstood concepts and careless reading. Revise the appropriate section before repeating the chapter.

How to review Gaseous Exchange after the quiz

List the questions you missed from Gaseous Exchange and write the textbook heading connected with each one. Explain the correct idea in your own words, then return later and answer a fresh set. This gives the chapter page a clear purpose: finding specific weaknesses in Biology rather than only collecting a score.

Accuracy and responsible use

Explanations are provided where they exist in the question bank, but educational databases can contain incomplete or mistaken material. Confirm disputed answers with an authoritative textbook or teacher. Ahmad Learning Hub provides a practice resource and does not claim that a question will appear in an examination or that every available item represents an official board question.