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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.
| 2401. |
Which of the following cause soil pollution? |
| A. | Insecticides |
| B. | Fertilizers |
| C. | Manure |
| D. | Both (a) and (b) |
| Answer» E. | |
| 2402. |
Which of the following farming practices helps to prevent the erosion of topsoil? |
| A. | Ploughing a field perpendicular to the contour lines. |
| B. | Ploughing a field parallel to the contour lines. |
| C. | Ploughing a field in the direction that the water drains. |
| D. | None of these will help to prevent soil erosion. |
| Answer» C. Ploughing a field in the direction that the water drains. | |
| 2403. |
As a rock breaks into smaller pieces, the surface area to volume ratio ________. |
| A. | increases |
| B. | decreases |
| C. | stays the same |
| D. | can increase or decrease depending on the size of the pieces |
| Answer» B. decreases | |
| 2404. |
Various layers of soil are called: |
| A. | soil profile |
| B. | soil erosion |
| C. | horizon |
| D. | None of these |
| Answer» D. None of these | |
| 2405. |
Which soil has the highest percolation rate of water? |
| A. | Sandy soil |
| B. | Clayey soil |
| C. | Loamy soil |
| D. | All have the same percolation rate |
| Answer» B. Clayey soil | |
| 2406. |
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): Soils can be classified on the basis of proportions of particles of various sizes present in them. Reason (R): In loamy soil the proportion of large and fine particles is almost same. |
| 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. | |
| 2407. |
Which of the following layers of the soil contain more humus? |
| A. | Top soil |
| B. | Subsoil |
| C. | Bed rock |
| D. | Both (B) and (C) |
| Answer» B. Subsoil | |
| 2408. |
Why sandy soil is so well aerated? |
| A. | Due to large spaces between particles. |
| B. | Presence of air in large spaces between the particles. |
| C. | Presence of water in large spaces available between the particles |
| D. | None of these |
| Answer» C. Presence of water in large spaces available between the particles | |
| 2409. |
______ affect the soil profile and bring changes in soil structure. |
| A. | Vegetation |
| B. | Animals |
| C. | Climatic factors |
| D. | Fertilizers |
| Answer» D. Fertilizers | |
| 2410. |
Which of the following are considered as natural tillers of the soil"? |
| A. | Earthworms |
| B. | Canis lupus |
| C. | Apis indica |
| D. | Roundworms |
| Answer» B. Canis lupus | |
| 2411. |
Which of the following are the constituents of soil? |
| A. | Air and water only. |
| B. | Water and plants only. |
| C. | Minerals, organic matter, air and water. |
| D. | Water, air and plants only. |
| Answer» D. Water, air and plants only. | |
| 2412. |
Which soil has the right water holding capacity for growth of plants? |
| A. | Sandy soil |
| B. | Clayey soil |
| C. | Loamy soil |
| D. | None of these |
| Answer» D. None of these | |
| 2413. |
Which soil is used to make pots and toys? |
| A. | Sandy soil |
| B. | Clayey soil |
| C. | Loamy soil |
| D. | None of these |
| Answer» C. Loamy soil | |
| 2414. |
Which soil is used to grow cotton? |
| A. | Sandy soil |
| B. | Clayey and loamy soil |
| C. | Sandy loam soil |
| D. | None of these |
| Answer» D. None of these | |
| 2415. |
Which of the following crops are grown in loamy soil? |
| A. | Cereals |
| B. | Pulses |
| C. | Vegetables |
| D. | All of these |
| Answer» E. | |
| 2416. |
___________ we can see the soil profile. |
| A. | At the sides of a road on a hill |
| B. | At steep of river bank |
| C. | Both the above |
| D. | None of these |
| Answer» D. None of these | |
| 2417. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 2 We obtain energy by aerobic respiration. But anaerobic respiration can sometimes take place in our muscles during vigorous physical exercise when oxygen gets used up faster in the muscle cells than can be supplied by the blood. Why do we inhale more oxygen when we run fast? |
| A. | we breathe fast |
| B. | Our heart beats faster |
| C. | We need more energy |
| D. | all of these |
| Answer» E. | |
| 2418. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 1 Fig. Model to show mechanism of breathing. The figure shows a plastic bottle whose bottom has been removed. A tube has been passed by making a hole in its lid. To the forked ends of this tube are attached two deflated balloons. The bottle is sealed in such a way that it becomes air-tight. What do balloons in this figure represent? |
| A. | breathing |
| B. | respiration |
| C. | lungs |
| D. | none of these |
| Answer» D. none of these | |
| 2419. |
Respiration is a/an ______ process. |
| A. | anabolic |
| B. | metabolic |
| C. | catabolic |
| D. | none of these |
| Answer» C. catabolic | |
| 2420. |
Which of the following represents the respiration process in yeast? |
| A. | \[\text{Glucose}\xrightarrow{\text{use of oxygen}}\]Carbon dioxide + water + energy |
| B. | \[\text{Glucose}\xrightarrow{\text{use of oxygen}}\]Lactic acid + energy |
| C. | \[\text{Glucose}\xrightarrow{\text{Without use of oxygen}}\]Lactic acid + energy |
| D. | \[\text{Glucose}\xrightarrow{\text{Without use of oxygen}}\]alcohol + carbon dioxide + energy. |
| Answer» E. | |
| 2421. |
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): Breathing in and out is a simple physical process. Reason (R): Breathing occurs only in animals and not in plants. |
| 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. | |
| 2422. |
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. The process used in manufacture of wine is a kind of |
| A. | aerobic respiration |
| B. | anaerobic respiration |
| C. | process in which no energy is produced |
| D. | none of the above |
| Answer» C. process in which no energy is produced | |
| 2423. |
DIRECTION: Match Column I with Column II and select the correct answer using the code given below the columns. Column-I Column-II (A) Fish (p) skin and lungs (B) Snake (q) lungs (C) Humans (r) cell membrane (D) Amoeba (s) gills |
| A. | (A) \[\to \] (r), (B) \[\to \] (p), (C) \[\to \] (s), (D) \[\to \] (q) |
| B. | (A) \[\to \] (q), (B) \[\to \] (r), (C) \[\to \] (p), (D) \[\to \] (s) |
| C. | (A) \[\to \] (s), (B) \[\to \] (p), (C) \[\to \] (q), (D) \[\to \] (r) |
| D. | (A) \[\to \] (p), (B) \[\to \] (q), (C) \[\to \] (s), (D) \[\to \] (r) |
| Answer» D. (A) \[\to \] (p), (B) \[\to \] (q), (C) \[\to \] (s), (D) \[\to \] (r) | |
| 2424. |
To present entry of food into the trachea, the opening is guarded by ______ . |
| A. | epiglottis |
| B. | glottis |
| C. | hard palate |
| D. | soft palate |
| Answer» B. glottis | |
| 2425. |
The percentage of carbon dioxide in exhaled air is |
| A. | 0.0004 |
| B. | 0.004 |
| C. | 0.044 |
| D. | 0.064 |
| Answer» D. 0.064 | |
| 2426. |
Exchange of gases in mammal take place through |
| A. | trachea |
| B. | bronchi |
| C. | alveoli |
| D. | none of these |
| Answer» B. bronchi | |
| 2427. |
Select the one that is correct: While we exercise |
| A. | we breathe fast |
| B. | we breathe deep |
| C. | we inhale more oxygen |
| D. | all of these |
| Answer» E. | |
| 2428. |
In cockroaches, air enters the body through |
| A. | lungs |
| B. | gills |
| C. | spiracles |
| D. | skin |
| Answer» D. skin | |
| 2429. |
Which of the following is the correct sequence of air passage during inhalation? |
| A. | nostrils\[\to \]larynx\[\to \]pharynx\[\to \]trachea\[\to \]lungs |
| B. | nostrils\[\to \]pharynx\[\to \]larynx\[\to \]trachea\[\to \]alveoli |
| C. | larynx\[\to \]nostrils\[\to \]trachea\[\to \]lungs |
| D. | nasal passage\[\to \]trachea\[\to \]pharynx\[\to \]larynx\[\to \]alveoli |
| Answer» C. larynx\[\to \]nostrils\[\to \]trachea\[\to \]lungs | |
| 2430. |
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): Sneezing expels dust particles from inhaled air. Reason (R): There are hairs inside our nose which helps in trapping the dust particles from inhaled air. |
| 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. | |
| 2431. |
DIRECTIONS: Carefully observe pictures given below and answer the following questions. Identify the parts labeled as C and D. |
| A. | C = trachea, D = alveolus |
| B. | C = larynx, D = trachea |
| C. | C = alveolus, D = larynx |
| D. | C = larynx, D = bronchus |
| Answer» E. | |
| 2432. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 4 An animal P can stay in water as well as on land and can breathe both, through moist skin and lungs. Another animal Q lives in soil and breathes only through its skin. Another animal R lives in water and breathes through cell membrane. What could be animal P? |
| A. | man |
| B. | frog |
| C. | fish |
| D. | dog |
| Answer» D. dog | |
| 2433. |
When we inhale, we breathe in air into the lungs. What do we breathe out when we exhale? |
| A. | Only oxygen gas. |
| B. | Only hydrogen gas. |
| C. | Air that has more oxygen than inhaled air. |
| D. | Air that has more carbon dioxide than inhaled air. |
| Answer» E. | |
| 2434. |
Why do whales and dolphins often come upto the water surface? |
| A. | To swim |
| B. | To get sufficient sunlight |
| C. | To breathe |
| D. | To get food |
| Answer» D. To get food | |
| 2435. |
Which of the following substances is/are present in a higher percentage in exhaled air than in inhaled air? (i) Carbon dioxide (ii) Oxygen (iii) Water vapour (iv) Nitrogen |
| A. | (i) only |
| B. | (i) and (iii) only |
| C. | (ii) and (iv) only |
| D. | (i), (ii), (iii) and (iv) |
| Answer» C. (ii) and (iv) only | |
| 2436. |
What is the correct sequence for the air to exhaled out from the lungs? R - Bronchus S - Trachea T - Alveolus U - Bronchiole |
| A. | \[\text{S}\to \text{U}\to \text{R}\to \text{T}\] |
| B. | \[\text{S}\to \text{R}\to \text{U}\to \text{T}\] |
| C. | \[\text{T}\to \text{U}\to \text{R}\to \text{S}\] |
| D. | \[\text{T}\to \text{R}\to \text{U}\to \text{S}\] |
| Answer» D. \[\text{T}\to \text{R}\to \text{U}\to \text{S}\] | |
| 2437. |
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 | |
| 2438. |
Match column I with column II and select the correct option from the codes given below. Column I Column II (a) Earthworm (i) Pulmonary respiration (b) Human (ii) Branchial respiration (c) Prawn (iii) Tracheal respiration (d) Insects (iv) Cutaneous respiration |
| A. | (a) - (i), (b) - (ii), (c) - (iii), (d) - (iv) |
| B. | (a) - (iv), (b) - (i), (c) - (ii), (d) - (iii) |
| C. | (a) - (iii), (b) - (ii), (c) - (iv), (d) - (i) |
| D. | (a) - (iv), (b) - (ii), (c) - (i), (d) - (iii) |
| Answer» C. (a) - (iii), (b) - (ii), (c) - (iv), (d) - (i) | |
| 2439. |
Which of the following terms is also called anaerobic respiration? |
| A. | Fermentation |
| B. | Imbibition |
| C. | Transportation |
| D. | Osmosis |
| Answer» B. Imbibition | |
| 2440. |
Rohan set up an experiment as shown in the figure. What will he observe after sometime? |
| A. | Lime water in test tube Y turns milky. |
| B. | Lime water in test tube Z turns milky. |
| C. | Potassium hydroxide solution in test tube X turns blue. |
| D. | Temperature in the flask will go down. |
| Answer» C. Potassium hydroxide solution in test tube X turns blue. | |
| 2441. |
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 | |
| 2442. |
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 | |
| 2443. |
Why do we get, muscle cramps after heavy exercise? |
| A. | It is due to the partial breakdown of glucose to produce lactic acid. |
| B. | It is due to the complete breakdown of glucose to produce lactic acid. |
| C. | It is due to the muscle cells that respire in the presence of oxygen. |
| D. | It is due to the increased supply of oxygen to muscle cells. |
| Answer» B. It is due to the complete breakdown of glucose to produce lactic acid. | |
| 2444. |
Farheen soaked some bean seeds in water overnight. Next morning she drained the water and kept the seeds moist till they started germinating. She boiled half of the seeds and then kept the germinating seeds in one thermos flask (X) and the 'boiled seeds in another thermos flask (Y).She covered the mouths of both flasks with moist cotton wool. Then she inserted thermometers in both flasks and kept the flasks as shown in the figure.What would be her observation? |
| A. | Temperature of flask X increases because it has photosynthesizing seeds. |
| B. | Temperature of flask X increases because it has respiring seeds. |
| C. | Temperature of flask Y increases because it has boiled seeds. |
| D. | Both (B) and (C) |
| Answer» C. Temperature of flask Y increases because it has boiled seeds. | |
| 2445. |
When a person breathes in, what happens to the diaphragm and to the rib cage? |
| A. | Diaphragm Rib cage Becomes flatten Moves downwards and inwards |
| B. | Diaphragm Rib cage Becomes flatten Moves outwards and upwards |
| C. | Diaphragm Rib cage Becomes more curved Moves downwards and inwards |
| D. | Diaphragm Rib cage Becomes more curved Moves outwards and upwards |
| Answer» C. Diaphragm Rib cage Becomes more curved Moves downwards and inwards | |
| 2446. |
A person put warm water in an aquarium, thinking that the fish would be more comfortable in it. However, the fish died. What can be the reason for this? |
| A. | The concentration of oxygen decreases in warm water. |
| B. | The concentration of carbon dioxide increases in warm water. |
| C. | Fish cannot bear the extreme heat of the water. |
| D. | All of these |
| Answer» B. The concentration of carbon dioxide increases in warm water. | |
| 2447. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 2 The transfer of pollen from the anther to the stigma of a flower is called pollination. If the pollen lands on the stigma of the same flower it is called self-pollination. When the pollen of a flower lands on the stigma of another flower of the same plant, or that of a different plant of the same kind, it is called cross-pollination. Which of the following can carry pollen grains? |
| A. | Wind |
| B. | Water |
| C. | both wind and water |
| D. | none of these |
| Answer» D. none of these | |
| 2448. |
Bryophyllum can reproduce by |
| A. | stem |
| B. | root |
| C. | leaves |
| D. | flower |
| Answer» D. flower | |
| 2449. |
Why the plants are produced by vegetative propagation an exact copy of parent plant? |
| A. | They are produced under controlled conditions |
| B. | They are produced from single parents |
| C. | both the above |
| D. | none of these |
| Answer» C. both the above | |
| 2450. |
Which of the following is a type of asexual reproduction? |
| A. | Oogenesis |
| B. | Gametogenesis |
| C. | Fragmentation |
| D. | none of these |
| Answer» D. none of these | |