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MCQOPTIONS
This section includes 2637 Mcqs, each offering curated multiple-choice questions to sharpen your 7th Class knowledge and support exam preparation. Choose a topic below to get started.
| 351. |
DIRECTIONS: Carefully observe pictures given below and answer the following questions. In the test-tubes 'A' and 'B' shown below, yeast was kept in sugar solution. The products of respiration expected in tube 'A' are |
| A. | Ethanol and carbon dioxide |
| B. | Carbon dioxide and water |
| C. | Lactic acid |
| D. | None of these |
| Answer» B. Carbon dioxide and water | |
| 352. |
DIRECTIONS: Carefully observe pictures given below and answer the following questions. A graph was plotted to show the energy output at two types of respiration. Identify the type of respiration denoted by curves A and B. |
| A. | Curve 'A' represents anaerobic respiration and curve 'B' represents aerobic respiration |
| B. | Curve 'A' represents aerobic respiration and curve 'B' represents anaerobic respiration. |
| C. | Both the curves represent aerobic respiration |
| D. | Both the curves represent anaerobic respiration |
| Answer» B. Curve 'A' represents aerobic respiration and curve 'B' represents anaerobic respiration. | |
| 353. |
DIRECTIONS: Carefully observe pictures given below and answer the following questions. The process shown in figure represents |
| A. | Exhalation |
| B. | inhalation |
| C. | Breathing |
| D. | Sneezing |
| Answer» B. inhalation | |
| 354. |
DIRECTIONS: Read the following two statements carefully and choose the correct options. (i) Plants have special organs of respiration called tracheae. (ii) Roots breathe in air from air spaces in the soil. |
| A. | Statement (i) is correct while statement (ii) is incorrect. |
| B. | Statement (ii) is correct while statement (i) is incorrect. |
| C. | Both statements are correct. |
| D. | Both statements are incorrect. |
| Answer» C. Both statements are correct. | |
| 355. |
DIRECTIONS: Read the following two statements carefully and choose the correct options. (i) Taking in of oxygen in inhalation. (ii) Breathing rate is number of inhalation and exhalation in one minute. |
| A. | Statement (i) is correct while statement (ii) is incorrect. |
| B. | Statement (ii) is correct while statement (i) is incorrect. |
| C. | Both statements are correct. |
| D. | Both statements are incorrect. |
| Answer» D. Both statements are incorrect. | |
| 356. |
During exercise, we get cramps in the legs due to the accumulation of_________. |
| A. | alcohol |
| B. | water |
| C. | Lactic acid |
| D. | carbon dioxide |
| Answer» D. carbon dioxide | |
| 357. |
DIRECTIONS: Read the following two statements carefully and choose the correct options. (i) Percentage of carbon dioxide is more in inhaled air as compared to that in exhaled air. (ii) The capacity of human lungs for air in a healthy person is 1500 ml. |
| A. | Statement (i) is correct while statement (ii) is incorrect. |
| B. | Statement (ii) is correct while statement (i) is incorrect. |
| C. | Both statements are correct. |
| D. | Both statements are incorrect. |
| Answer» E. | |
| 358. |
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): When we breathe fast we inhale more oxygen. Reason (R): When we inhale air it passes through nasal cavity. |
| A. | Both A and R is true and R is the correct explanation of A. |
| B. | Both A and R is true but R is not the correct explanation of A. |
| C. | A is true but R is false. |
| D. | A is false but R is true. |
| Answer» C. A is true but R is false. | |
| 359. |
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): When our muscle cells respire an aerobically cramps occur. Reason (R): The accumulation of lactic acid causes cramps |
| A. | Both A and R is true and R is the correct explanation of A. |
| B. | Both A and R is true but R is not the correct explanation of A. |
| C. | A is true but R is false. |
| D. | A is false but R is true. |
| Answer» B. Both A and R is true but R is not the correct explanation of A. | |
| 360. |
DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Yeast is a single celled organism that can respire an aerobically. Reason (R): Yeast is used to make wine and beer. |
| A. | Both A and R is true and R is the correct explanation of A. |
| B. | Both A and R is true but R is not the correct explanation of A. |
| C. | A is true but R is false. |
| D. | A is false but R is true. |
| Answer» C. A is true but R is false. | |
| 361. |
DIRECTIONS: Read the passage(s) given below and answer the questions that follow. Passage - 4 Lungs are present in chest cavity. This cavity is surrounded by ribs on the sides. A large muscular sheet called diaphragm form the floor of the chest cavity. Percentage of oxygen in inhaled air is ____ in exhaled air. |
| A. | less than |
| B. | more than |
| C. | same as |
| D. | cannot say |
| Answer» C. same as | |
| 362. |
DIRECTIONS: Read the passage(s) given below and answer the questions that follow. Passage - 4 Lungs are present in chest cavity. This cavity is surrounded by ribs on the sides. A large muscular sheet called diaphragm form the floor of the chest cavity. During inhalation the ribs move ____ and diaphragm moves ______. |
| A. | down, up |
| B. | up, down |
| C. | up, up |
| D. | down, down |
| Answer» C. up, up | |
| 363. |
DIRECTIONS: Read the passage(s) given below and answer the questions that follow. Passage - 3 Plants also respire. They have small openings through which gaseous exchange take place. The roots take in air present in soil. The breakdown of glucose in plant cell is similar to that in other lining beings. Plants take in _____ gas during respiration |
| A. | oxygen |
| B. | carbon dioxide |
| C. | nitrogen |
| D. | water vapour |
| Answer» B. carbon dioxide | |
| 364. |
DIRECTIONS: Read the passage(s) given below and answer the questions that follow. Passage - 3 Plants also respire. They have small openings through which gaseous exchange take place. The roots take in air present in soil. The breakdown of glucose in plant cell is similar to that in other lining beings. Roots take up air from _____. |
| A. | lenticels |
| B. | stomata |
| C. | air spaces |
| D. | spiracles |
| Answer» D. spiracles | |
| 365. |
Smoking can cause |
| A. | cancer |
| B. | fever |
| C. | anaemia |
| D. | Goitre |
| Answer» B. fever | |
| 366. |
DIRECTIONS: Read the passage(s) given below and answer the questions that follow. Passage - 3 Plants also respire. They have small openings through which gaseous exchange take place. The roots take in air present in soil. The breakdown of glucose in plant cell is similar to that in other lining beings. The tiny pores present in plants are called |
| A. | holes |
| B. | stigmata |
| C. | stomata |
| D. | spiracles |
| Answer» D. spiracles | |
| 367. |
DIRECTIONS: Read the passage(s) given below and answer the questions that follow. Passage - 2 Fermentation is a kind of anaerobic respiration done by bacteria and fungi. In it, food substrate lies outside the cell in a liquid medium and is oxidized to form organic acids or alcohol. This process is used in the manufacture of wine. Yeast is |
| A. | an anaerobe |
| B. | a single celled organism |
| C. | both the above are correct |
| D. | none of the above is correct |
| Answer» D. none of the above is correct | |
| 368. |
DIRECTIONS: Read the passage(s) given below and answer the questions that follow. Passage - 2 Fermentation is a kind of anaerobic respiration done by bacteria and fungi. In it, food substrate lies outside the cell in a liquid medium and is oxidized to form organic acids or alcohol. This process is used in the manufacture of wine. Name the process used in manufacture of wine. |
| A. | Photorespiration |
| B. | Fermentation |
| C. | aerobic respiration |
| D. | none of these |
| Answer» C. aerobic respiration | |
| 369. |
DIRECTIONS: Read the passage(s) given below and answer the questions that follow. Passage - 1 Respiration is the basic characteristics of all living beings. It is an energy releasing reaction. In this process the living cells break down the complex high energy food molecules into simple low energy molecules by oxidation, forming carbon dioxide and water. In this a large amount of energy is released, which is used to carry out various life activities by the organism. Respiration in human beings: |
| A. | involves exchange of gases |
| B. | involves inspiration and expiration |
| C. | involves oxidation of glucose |
| D. | all the above are correct |
| Answer» E. | |
| 370. |
DIRECTIONS: Read the passage(s) given below and answer the questions that follow. Passage - 1 Respiration is the basic characteristics of all living beings. It is an energy releasing reaction. In this process the living cells break down the complex high energy food molecules into simple low energy molecules by oxidation, forming carbon dioxide and water. In this a large amount of energy is released, which is used to carry out various life activities by the organism. Which type of respiration is found in yeast? |
| A. | aerobic respiration |
| B. | anaerobic respiration |
| C. | respiration using oxygen |
| D. | none of these |
| Answer» C. respiration using oxygen | |
| 371. |
DIRECTION: Match Column I with Column II and select the correct answer using the code given below the columns. Column-I Column-II (A) Plants (p) Blow holes (B) Whales (q) Spiracles (C) Mosquito (r) Stomata (D) Frog (s) skin |
| A. | (A) \[\to \] (q), (B) \[\to \] (s), (C) \[\to \] (p), (D) \[\to \] (r) |
| B. | (A) \[\to \] (s), (B) \[\to \] (q), (C) \[\to \] (r), (D) \[\to \] (p) |
| C. | (A) \[\to \] (r), (B) \[\to \] (p), (C) \[\to \] (q), (D) \[\to \] (s) |
| D. | (A) \[\to \] (p), (B) \[\to \] (r), (C) \[\to \] (s), (D) \[\to \] (q) |
| Answer» D. (A) \[\to \] (p), (B) \[\to \] (r), (C) \[\to \] (s), (D) \[\to \] (q) | |
| 372. |
DIRECTION: Match Column I with Column II and select the correct answer using the code given below the columns. Column-I Column-II (A) Inhalation (p) fermentation (B) Exhalation (q) taking in \[{{\text{O}}_{\text{2}}}\] (C) Anaerobic (r) Presence of \[{{\text{O}}_{\text{2}}}\] (D) Aerobic (s) giving out \[{{\text{O}}_{\text{2}}}\] |
| A. | (A) \[\to \] (s), (B) \[\to \] (q), (C) \[\to \] (p), (D) \[\to \] (r) |
| B. | (A) \[\to \] (q), (B) \[\to \] (s), (C) \[\to \] (p), (D) \[\to \] (r) |
| C. | (A) \[\to \] (p), (B) \[\to \] (r), (C) \[\to \] (q), (D) \[\to \] (s) |
| D. | (A) \[\to \] (r), (B) \[\to \] (p), (C) \[\to \] (q), (D) \[\to \] (s) |
| Answer» C. (A) \[\to \] (p), (B) \[\to \] (r), (C) \[\to \] (q), (D) \[\to \] (s) | |
| 373. |
Gills are for |
| A. | terrestrial respiration |
| B. | aquatic respiration |
| C. | pulmonary respiration |
| D. | all of these |
| Answer» C. pulmonary respiration | |
| 374. |
An adult human being breathes in and out for ______ times in a minute. |
| A. | 15-18 |
| B. | 42278 |
| C. | 20-25 |
| D. | 50-60 |
| Answer» E. | |
| 375. |
The actual site of gaseous exchange in respiratory system is |
| A. | trachea |
| B. | bronchioles |
| C. | alveli |
| D. | all of these |
| Answer» D. all of these | |
| 376. |
Earthworms respire through |
| A. | moist skin |
| B. | clitellum |
| C. | spiracles |
| D. | lungs |
| Answer» B. clitellum | |
| 377. |
The diaphragm remains _______ in normal position. |
| A. | flattened |
| B. | arched |
| C. | perforated |
| D. | varies |
| Answer» C. perforated | |
| 378. |
The narrowest and most numerous tubes of lungs are called ______. |
| A. | bronchus |
| B. | bronchioles |
| C. | alveoli |
| D. | None of these |
| Answer» C. alveoli | |
| 379. |
Gaseous exchange in plants occurs through ____ and _______. |
| A. | Stroma, grana |
| B. | stomata, lenticels |
| C. | Guard cells, grana |
| D. | none of these |
| Answer» C. Guard cells, grana | |
| 380. |
Anaerobic respiration is also called |
| A. | transportation |
| B. | breathing |
| C. | fermentation |
| D. | imbibition |
| Answer» D. imbibition | |
| 381. |
How do the anaerobes get energy? |
| A. | by anaerobic respiration |
| B. | by aerobic respiration |
| C. | both the above are correct |
| D. | none of these is correct |
| Answer» B. by aerobic respiration | |
| 382. |
During sneezing, we expel |
| A. | foreign particles from inhaled air |
| B. | cough |
| C. | both the above |
| D. | none of these |
| Answer» B. cough | |
| 383. |
Which of the following is correct about yeast? |
| A. | It is a single celled organism |
| B. | It respires an aerobically |
| C. | both the above are correct |
| D. | none of the above is correct |
| Answer» D. none of the above is correct | |
| 384. |
Which of these forms the floor of the chest cavity? |
| A. | Lungs |
| B. | ribs |
| C. | diaphragm |
| D. | all of these |
| Answer» D. all of these | |
| 385. |
A breath means |
| A. | one inhalation |
| B. | one exhalation |
| C. | one inhalation and one exhalation |
| D. | none of the above is correct |
| Answer» D. none of the above is correct | |
| 386. |
During inspiration, air passes into lungs due to |
| A. | increase in volume of thoracic cavity and lower lung pressure |
| B. | fall in pressure inside the lungs |
| C. | increased volume of thoracic cavity |
| D. | muscular expansion of lungs |
| Answer» B. fall in pressure inside the lungs | |
| 387. |
Which of the following sets represent the products of anaerobic respiration in yeast? |
| A. | Alcohol and carbon dioxide |
| B. | Carbon dioxide and glucose |
| C. | Glucose and oxygen |
| D. | Oxygen and alcohol |
| Answer» B. Carbon dioxide and glucose | |
| 388. |
In our body glucose breaks down to carbon dioxide and water. Energy is released during this process. It can be represented by the following equation: Glucose + Oxygen Carbon dioxide + Water + Energy Which of the following processes is represented by the above equation? |
| A. | Photosynthesis |
| B. | Combustion |
| C. | Respiration |
| D. | Breathing |
| Answer» D. Breathing | |
| 389. |
During exhalation, the ribs |
| A. | move outwards |
| B. | more downwards |
| C. | move upwards |
| D. | none of these is correct |
| Answer» C. move upwards | |
| 390. |
Oxygen is carried to the tissues of an insect by |
| A. | blood |
| B. | gills |
| C. | lungs |
| D. | tracheae |
| Answer» E. | |
| 391. |
At high altitude, RBC of human blood will |
| A. | increase in number |
| B. | decrease in number |
| C. | increase in size |
| D. | decrease in size |
| Answer» C. increase in size | |
| 392. |
Which of the following in not correct for the process of breathing in air? |
| A. | Air rushes into our lungs |
| B. | Our ribs are raised |
| C. | Our diaphragm is curved upwards further |
| D. | The volume of our chest increases |
| Answer» D. The volume of our chest increases | |
| 393. |
What happens when human body cells are deprived of oxygen? |
| A. | They lose energy |
| B. | They die |
| C. | They stop working until the oxygen supply is resumed |
| D. | all the above are correct |
| Answer» C. They stop working until the oxygen supply is resumed | |
| 394. |
Which of the following increases in muscle cells when they are lacking in oxygen? |
| A. | uric acid |
| B. | lactic acid |
| C. | lactose |
| D. | carbon dioxide |
| Answer» C. lactose | |
| 395. |
Each human lungs contain _____ alveoli. |
| A. | 100 million |
| B. | 300 million |
| C. | 200 million |
| D. | 400 million |
| Answer» D. 400 million | |
| 396. |
Covering of lungs is called |
| A. | pericardium |
| B. | pleural membrane |
| C. | peritoneum |
| D. | perichondrium |
| Answer» C. peritoneum | |
| 397. |
Lungs have large number of alveoli for |
| A. | more nerve supply |
| B. | having proper shape |
| C. | more space for increasing volume of inspired air |
| D. | more surface area for diffusion of gases. |
| Answer» E. | |
| 398. |
DIRECTIONS: Carefully observe pictures given below and answer the following questions. Look at the image given below and answer the questions that follow. Which part contains alveoli? |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 399. |
DIRECTIONS: Carefully observe pictures given below and answer the following questions. Look at the image given below and answer the questions that follow. The part labeled as 'B' is __________. |
| A. | Lung |
| B. | Diaphragm |
| C. | Trachea |
| D. | Bronchiole |
| Answer» D. Bronchiole | |
| 400. |
DIRECTIONS: Carefully observe pictures given below and answer the following questions. Look at the image given below and answer the questions that follow. The part diaphragm is marked as |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» E. | |