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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.
| 401. |
DIRECTIONS: Read the following three statements and choose the correct answer. (i) In anaerobic respiration, glucose is broken down into carbon dioxide and alcohol (ii) In anaerobic respiration, pyruvic acid in muscles from alcohol. (iii) Energy is not released in anaerobic Respiration. |
| A. | Statement (i) and (iii) are incorrect but (ii) is correct |
| B. | Statement (i) and (ii) are incorrect but (iii) is correct |
| C. | All statements are correct |
| D. | All statements are incorrect |
| Answer» B. Statement (i) and (ii) are incorrect but (iii) is correct | |
| 402. |
DIRECTIONS: Read the following three statements and choose the correct answer. (i) In insects, the circulatory fluid help to distribute oxygen to tissues. (ii) The process of respiration in yeast is anaerobic (iii) Anaerobic respiration causes cramps in muscles. |
| A. | Statement (i) and (iii) are incorrect but (ii) is correct |
| B. | Statement (i) and (ii) are incorrect but (iii) is correct |
| C. | All statements are correct |
| D. | All statements are incorrect |
| Answer» D. All statements are incorrect | |
| 403. |
______ prevents collapsing of trachea. |
| A. | diaphragm |
| B. | ribs |
| C. | muscles |
| D. | cartilaginous rings |
| Answer» E. | |
| 404. |
DIRECTIONS: Read the following three statements and choose the correct answer. (i) In earthworms the gaseous exchange take place through the moist skin. (ii) Tracheae and spiracles are present in frogs (iii) Fish breathe through gills. |
| A. | Statement (i) and (iii) are incorrect but (ii) is correct |
| B. | Statement (i) and (ii) are incorrect but (iii) is correct |
| C. | All statements are correct |
| D. | All statements are incorrect |
| Answer» B. Statement (i) and (ii) are incorrect but (iii) is correct | |
| 405. |
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): In plants each part can independently take in oxygen from air and give out oxygen. Reason (R): In plants the roots take in air present in soil. |
| A. | Both A and R are true and R is the correct explanation of A. |
| B. | Both A and R are 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. | |
| 406. |
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): Fish cannot live outside water. Reason (R): Fish breathe through gills. |
| A. | Both A and R are true and R is the correct explanation of A. |
| B. | Both A and R are 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 are true but R is not the correct explanation of A. | |
| 407. |
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): During physical exercise the breathing rate of a person slows down. Reason (R): Our body requires less oxygen during any kind of physical activity. |
| A. | Both A and R are true and R is the correct explanation of A. |
| B. | Both A and R are 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» E. | |
| 408. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 3 An organism X having breathing organs A lives on land. When X goes under water it cannot survive long. On the other hand organism Y with breathing organs B always lives in water and if taken out of water dies after a short time. Name the breathing organ B. |
| A. | lungs |
| B. | skin |
| C. | gills |
| D. | None of these |
| Answer» D. None of these | |
| 409. |
During exhalation size of chest cavity |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | first increases then decreases |
| Answer» C. remains same | |
| 410. |
Which of the following organism can respire in total absence of air? |
| A. | tapeworm |
| B. | hydra |
| C. | earthworm |
| D. | amoeba |
| Answer» B. hydra | |
| 411. |
Which of these are the organs of human respiratory system? |
| A. | Trachea |
| B. | Bronchus |
| C. | Alveolus |
| D. | All of these |
| Answer» E. | |
| 412. |
Identify the labelled parts P, Q and R in the figure given below. |
| A. | P Q R Bronchus Bronchiole Alveolus |
| B. | P Q R Trachea Alveolus Bronchus |
| C. | P Q R Bronchus Bronchiole Diaphragm |
| D. | P Q R Trachea Aiveolus Diaphragm |
| Answer» E. | |
| 413. |
Read the given statements and select the correct option. (i) In insects, circulating body fluids serve to distribute oxygen to tissues. (ii) Yeasts respire aerobically, therefore, they are used to make wine and beer. (iii) Bronchitis is the inflammation of bronchi which may be caused on exposure to air pollutants. (iv) In a healthy person, maximum capacity of lungs for inhaled air is 1500 mL. (v) Sneezing expels the foreign particles from the inhaled air. |
| A. | Statements (i), (ii) and (iv) are incorrect, while statements (iii) and (v) are correct. |
| B. | Statements (i), (ii) and (iii) are incorrect, while statements (iv) and (v) are correct. |
| C. | Statement (ii) is incorrect, while statements (i), (iii), (iv) and (v) are correct. |
| D. | Statements (ii) and (v) are incorrect, while statements (i), (iii) and (iv) are correct. |
| Answer» B. Statements (i), (ii) and (iii) are incorrect, while statements (iv) and (v) are correct. | |
| 414. |
What is the function of the hair in the nose? |
| A. | To secrete mucus. |
| B. | To trap dust particles. |
| C. | To protect the mucus glands. |
| D. | To prevent germs from entering the lungs. |
| Answer» C. To protect the mucus glands. | |
| 415. |
Read the given passage and select the correct option for (i) - (iii).___(i)___ are present in the chest cavity. This cavity is surrounded by ___(ii)___ on the sides which form a cage like structure. A large muscular sheet called ___(iii)___ forms the floor of the chest cavity. |
| A. | (i)-Lungs; (ii)-Ribs; (iii)-Diaphragm |
| B. | (i)-Diaphragm; (ii)-Ribs; (iii)-Lungs |
| C. | (i)-Bronchi; (ii)-Ribs; (iii)-Lungs |
| D. | (i)-Trachea; (ii)-Bronchi; (iii)-Lungs |
| Answer» B. (i)-Diaphragm; (ii)-Ribs; (iii)-Lungs | |
| 416. |
Study the given experimental set up. Which of the following statements holds true when the rubber sheet is pulled down? (i) Air pressure inside the bell jar increases- (ii) The balloons inside jar expand. (iii) This is similar to expansion of lungs during inhalation. (iv) This is similar to contraction of lungs during exhalation. |
| A. | (ii), (iii) and (iv) only |
| B. | (ii) and (iii) only |
| C. | (i) and (iv) only |
| D. | (i), (iii) and (iv) only |
| Answer» C. (i) and (iv) only | |
| 417. |
Gas P diffuses from a capillary into an alveolus in the lungs. When is gas P expelled out from the alveolus? |
| A. | During inhalation |
| B. | During exhalation |
| C. | During perspiration |
| D. | During inspiration |
| Answer» C. During perspiration | |
| 418. |
In fishes gills are the respiratory organs. Gills are projections of which of the following parts? |
| A. | Nostril |
| B. | Alimentary canal |
| C. | Skin |
| D. | None of these |
| Answer» D. None of these | |
| 419. |
Select the correct sequence of words to complete the given passage.The pharynx actually has two apertures, one opening into the windpipe and the other into the ___. The aperture opening into the windpipe is guarded by ___. It closes the windpipe when you take ___. |
| A. | Oesophagus, Uvula, Food |
| B. | Stomach, Epiglottis, Water |
| C. | Oesophagus, Epiglottis, Food |
| D. | Liver, Uvula, Water |
| Answer» D. Liver, Uvula, Water | |
| 420. |
Which of the following animals breathe through their skin and lungs? |
| A. | Fish |
| B. | Frog |
| C. | Snake |
| D. | Earthworm |
| Answer» C. Snake | |
| 421. |
The classification table given below shows how different organisms breathe. Which of these organisms are correctly represented by X, Y and Z? |
| A. | X Y Z Tadpole Whale Earthworm |
| B. | X Y Z Fish Crocodile Cockroach |
| C. | X Y Z Frog Shark Toad |
| D. | X Y Z Prawn Grasshopper Cockroach |
| Answer» B. X Y Z Fish Crocodile Cockroach | |
| 422. |
Which of the following labelled parts represent diaphragm in the given figure? |
| A. | P |
| B. | Q |
| C. | R |
| D. | S |
| Answer» E. | |
| 423. |
A Which of the following for me the floor of the chest cavity? |
| A. | Lungs |
| B. | Membrane |
| C. | Diaphragm |
| D. | Pleura |
| Answer» D. Pleura | |
| 424. |
Which statement is NOT correct? |
| A. | Taking in of oxygen is inhalation. |
| B. | Taking in of carbondioxide is inhalation. |
| C. | Breathing rate is number of inhalation and exhalation in one minute. |
| D. | Giving out of carbondioxide is exhalation. |
| Answer» C. Breathing rate is number of inhalation and exhalation in one minute. | |
| 425. |
Which of the following diagram correctly illustrates the passage of oxygen in the respiratory system? |
| A. | Nose \[\to \] Lungs \[\to \] Wind pipe \[\to \] Blood |
| B. | Nose \[\to \] Blood \[\to \] Wind pipe \[\to \] Lungs |
| C. | Nose \[\to \]Blood \[\to \]Lungs \[\to \] Wind pipe |
| D. | Nose \[\to \] Wind pipe \[\to \] Lungs \[\to \] Blood |
| Answer» E. | |
| 426. |
In anaerobic respiration, glucose is broken down into which of the following substances? |
| A. | Carbon dioxide and water. |
| B. | Carbon dioxide and oxygen. |
| C. | Alcohol and carbon dioxide. |
| D. | Alcohol and oxygen. |
| Answer» D. Alcohol and oxygen. | |
| 427. |
Which organism is described in the information given below? (i) Respire anaerobically (ii) Used to make wine (iii) Reproduce by budding |
| A. | Potato |
| B. | Grapes |
| C. | Yeast |
| D. | Mucor |
| Answer» D. Mucor | |
| 428. |
Analysis of a sample of air gives the following details. Nitrogen Oxygen Carbon dioxide 78.0% 16.4% 4.4% From which of the following sources the sample of air is most probably taken |
| A. | Dissolved air from pond water. |
| B. | Fresh air from a field. |
| C. | Exhaled air. |
| D. | inhaled air. |
| Answer» D. inhaled air. | |
| 429. |
What will happen when diaphragm relaxes and curves upwards? |
| A. | Air is forced out of the lungs. |
| B. | The rib cage goes up and outward. |
| C. | The volume of the thoracic cavity increases. |
| D. | Air pressure inside the thoracic cavity decreases. |
| Answer» B. The rib cage goes up and outward. | |
| 430. |
Which of these organisms have lungs as respiratory organs? |
| A. | Cockroaches |
| B. | Earthworms |
| C. | Starfishes |
| D. | Rabbits |
| Answer» E. | |
| 431. |
In which of the following habitats gills are used for respiration? |
| A. | Terrestrial respiration |
| B. | Aquatic respiration |
| C. | Pulmonary respiration |
| D. | All types of respiration |
| Answer» C. Pulmonary respiration | |
| 432. |
Which of the following prevent the entry of food into the trachea? |
| A. | Epiglottis |
| B. | Glottis |
| C. | Hard palate |
| D. | Soft palate |
| Answer» B. Glottis | |
| 433. |
Earthworms respire through which of the following organs? |
| A. | Moist skin |
| B. | Ctenidia |
| C. | Clitellum |
| D. | Typhlosole |
| Answer» B. Ctenidia | |
| 434. |
What is the function of the stomata? |
| A. | To take in water |
| B. | To trap sunlight |
| C. | To take in gases |
| D. | To give out food |
| Answer» D. To give out food | |
| 435. |
Lenticels are found in which of the following parts of a plant? |
| A. | The stem in which secondary growth has taken place. |
| B. | The root where secondary growth has not taken place. |
| C. | The roots as well as the stem where secondary growth has occurred. |
| D. | The leaves and roots. |
| Answer» B. The root where secondary growth has not taken place. | |
| 436. |
In which of the following processes gills are used for respiration? |
| A. | Cutaneous respiration |
| B. | Branchial respiration |
| C. | Terrestrial respiration |
| D. | Pulmonary respiration |
| Answer» C. Terrestrial respiration | |
| 437. |
Respiration is an example of which of the following processes? |
| A. | Anabolic |
| B. | Catabolic |
| C. | Metabolic |
| D. | Both (A) and (C) |
| Answer» C. Metabolic | |
| 438. |
What happens when we breathe in? (i) Size of our chest increases. (ii) Size of our chest decreases. (iii) Carbon dioxide is removed from our body (iv) Air enters our lungs. |
| A. | (i) and (iii) are correct |
| B. | (i) and (iv) are correct |
| C. | (ii) and (iii) are correct |
| D. | (ii) and (iv) are correct |
| Answer» C. (ii) and (iii) are correct | |
| 439. |
Consider the following statements and select the option which correctly identifies true (T) and false (F) ones. (i) In cockroaches, air enters the body through spiracles.(ii) During heavy exercise, we get cramps in the legs due to accumulation of carbon dioxide. (iii) Normal range of breathing rate per minute in an average adult person at rest is 12-18.(iv) During exhalation, the ribs move upwards. |
| A. | (i)(ii)(iii)(iv)FTFT |
| B. | (i)(ii)(iii)(iv)TTFT |
| C. | (i)(ii)(iii)(iv)TFTF |
| D. | (i)(ii)(iii)(iv)TTTF |
| Answer» D. (i)(ii)(iii)(iv)TTTF | |
| 440. |
The following word equation shows a chemical process that take place in an organism Y. What is organism Y? |
| A. | Algae |
| B. | Protozoan |
| C. | Yeast |
| D. | Hydra |
| Answer» D. Hydra | |
| 441. |
Which of these are parts of the human respiratory system? (i) Mouth (ii) Nostrils (iii) Gullet (iv) Windpipe (v) Lungs |
| A. | (ii) and (v) only |
| B. | (ii), (iv) and (v) only |
| C. | (i), (ii), (iv) and (v) only |
| D. | All of the above |
| Answer» C. (i), (ii), (iv) and (v) only | |
| 442. |
The given diagram shows a respirometer that is used to measure gaseous exchange in gram seeds. The apparatus is maintained at a constant temperature. Which of the following is correct regarding it?(i) The gas pressure at X will fall as \[{{O}_{2}}\] is absorbed during respiration and\[C{{O}_{2}}\], is absorbed by potassium hydroxide solution.(ii) The fluid level at Y will fall to compensates the loss of pressure in X.(iii) The gas pressure at X will rise as 0;, is given out by seeds and \[C{{O}_{2}}\] is released by potassium hydroxide ;solution. (iv) The fluid level at Z will rise due to loss of pressure at X. |
| A. | (i), (ii) and (iv) only |
| B. | (ii), (iii) and (iv) only |
| C. | (i), (iii) and (iv) only |
| D. | (i), (ii) and (iii) only |
| Answer» B. (ii), (iii) and (iv) only | |
| 443. |
Three test tubes are set up as shown. The indicator used here changes from red to yellow when exposed to increased levels of carbon dioxide. At the start of the experiment, the indicator in each test tube was red. What will be the colour of the indicator in each test tube after two hours? |
| A. | ABCYellowYellowRed |
| B. | ABCRedYellowRed |
| C. | ABCYellowRedRed |
| D. | ABCYellowYellowYellow |
| Answer» C. ABCYellowRedRed | |
| 444. |
Study the given flow chart about respiratory structures in different organisms. Identify the organisms P, Q, R and S and select the correct option. |
| A. | P-Cockroach, Q-Tadpole, R-Pigeon, S-Earthworm |
| B. | P-Grasshopper, Q-Fish, R-Frog, S-Amoeba |
| C. | P-Spider, Q-Frog, R-Crab, S-Paramecium |
| D. | P-Mynah, Q-Snake, R-Penguin, S-Leech |
| Answer» C. P-Spider, Q-Frog, R-Crab, S-Paramecium | |
| 445. |
Lime water turns milky due to the presence of which of the following gases? |
| A. | Carbon monoxide |
| B. | Carbon dioxide |
| C. | Nitrogen |
| D. | Oxygen |
| Answer» C. Nitrogen | |
| 446. |
Breathing involves inspiration and expiration process. Which of the following take place during inspiration? |
| A. | Ribs move downward and outward. |
| B. | Ribs move upward and inward. |
| C. | Ribs move downward and inward. |
| D. | Ribs move upward and outward. |
| Answer» E. | |
| 447. |
The given figure illustrates the changes in lung volume during the process of breathing. The change from Q to R indicates the |
| A. | Movement of air out of the lungs |
| B. | Ribs move upward and outward |
| C. | Expansion of thoracic cavity |
| D. | Movement of diaphragm away from the lung. |
| Answer» B. Ribs move upward and outward | |
| 448. |
Which of the following statements is correct for anaerobic respiration? |
| A. | Food is broken down in the absence of oxygen to release energy. |
| B. | Breakdown of food occurs in presence of oxygen. |
| C. | It is a slow process compared to aerobic respiration. |
| D. | It produces large amount of energy compared to aerobic respiration. |
| Answer» B. Breakdown of food occurs in presence of oxygen. | |
| 449. |
Read the given paragraph.Sometimes, during strenuous activity such as long distance running, your body cannot get enough ___(i)___ to produce the required energy. To get the additional energy, ___(ii)___ respiration occurs within your muscle cells. In this process, there is partial breakdown of ___(iii)___ to produce ___(iv)___. the accumulation of which in the body causes ___(v)___. QComplete the above paragraph by selecting the correct sequence of words. |
| A. | Food, Aerobic, Starch, Uric acid, Uremia |
| B. | Carbon dioxide, Anaerobic, Protein, Lactic acid, Bone cramps |
| C. | Oxygen, Aerobic, Fructose, Hydrochloric acid, Muscular cramps |
| D. | Oxygen, Anaerobic, Glucose, Lactic acid, Muscular cramps |
| Answer» E. | |
| 450. |
Which of the following correctly represents the approximate composition of exhaled air by humans? |
| A. | \[{{O}_{2}}\]=21%\[C{{O}_{2}}\]=4.4% |
| B. | \[{{O}_{2}}\]=21%\[C{{O}_{2}}\]=0.03% |
| C. | \[{{O}_{2}}\]=16.4%\[C{{O}_{2}}\]=4.4% |
| D. | \[{{O}_{2}}\]=16.4%\[C{{O}_{2}}\]=0.03% |
| Answer» D. \[{{O}_{2}}\]=16.4%\[C{{O}_{2}}\]=0.03% | |