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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.
| 451. |
Read the following statements and select the correct option. Statement 1: Yeast is single-celled organisms which is used in baking and brewing industry. Statement 2: Yeast carry out anaerobic respiration, i.e., fermentation and release, ethyl alcohol and carbon dioxide. |
| A. | Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. |
| B. | Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. |
| C. | Statement 1 is true but statement 2 is false. |
| D. | Both statements 1 and 2 are false. |
| Answer» B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. | |
| 452. |
Which of the following organisms respire through tracheal system? |
| A. | Earthworm |
| B. | Cockroach |
| C. | Fish |
| D. | Frog |
| Answer» C. Fish | |
| 453. |
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. | |
| 454. |
What is the end product of glucose in the abscence of oxygen in muscle cells? |
| A. | Carbon dioxide |
| B. | Lactic acid |
| C. | Ethanol |
| D. | Water |
| Answer» C. Ethanol | |
| 455. |
What will happen when the thin rubber sheet is pulled downwards as shown in figure given below? |
| A. | Nothing will happen. |
| B. | The balloon will burst. |
| C. | The balloon will be deflated. |
| D. | The balloon will be inflated. |
| Answer» E. | |
| 456. |
What will happen when the thin rubber sheet is pushed upwards? |
| A. | Air is pulled in |
| B. | Air is forced out |
| C. | Air pressure in the bell jar increases |
| D. | No change |
| Answer» C. Air pressure in the bell jar increases | |
| 457. |
The given graph shows changes in the concentration of lactic acid in the muscles of an athlete both during and after race. At what time did the athletes finish the race? |
| A. | 2 minutes |
| B. | 5 minutes |
| C. | 4 minutes |
| D. | 6 minutes |
| Answer» D. 6 minutes | |
| 458. |
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) | |
| 459. |
Which of the following is the correct path of oxygen in humans during inhalation? |
| A. | Nostrils\[\to \]Nasal Cavity\[\to \]Pharynx\[\to \]Trachea\[\to \]Bronchi\[\to \]Bronchiole\[\to \] Alveoli |
| B. | Nostrils\[\to \]Nasal Cavity\[\to \]Trachea \[\to \]Pharynx\[\to \]Bronchi\[\to \]Bronchiole\[\to \] Alveoli |
| C. | Nostrils\[\to \]Nasal Cavity\[\to \]Pharynx \[\to \]Trachea \[\to \]Alveoli\[\to \]Bronchi\[\to \]Bronchiole |
| D. | Nostrils\[\to \]Nasal Cavity \[\to \]Pharynx\[\to \]Bronchi\[\to \]Trachea\[\to \]Bronchiole\[\to \] Alveoli |
| Answer» B. Nostrils\[\to \]Nasal Cavity\[\to \]Trachea \[\to \]Pharynx\[\to \]Bronchi\[\to \]Bronchiole\[\to \] Alveoli | |
| 460. |
Identify X in the given equation of aerobic respiration. |
| A. | Water |
| B. | Oxygen |
| C. | Ethyl alcohol |
| D. | Nitrogen |
| Answer» C. Ethyl alcohol | |
| 461. |
P Which of the following organisms are called decomposers? (i) Ants (ii) Bacteria (ii) Fungi (iv) Worms |
| A. | (i) and (ii) only |
| B. | (ii) and (iii) only |
| C. | (i), (ii) and (iii) only |
| D. | (ii), (iii) and (iv) only |
| Answer» C. (i), (ii) and (iii) only | |
| 462. |
Which of the following gases is increased in air in the absence of forests? |
| A. | Oxygen |
| B. | Nitrogen |
| C. | Carbon dioxide |
| D. | Hydrogen |
| Answer» D. Hydrogen | |
| 463. |
Which statement describes a food web? |
| A. | It is made up of an extra-long food chain. |
| B. | It is a food chain with goat as a consumer. |
| C. | It is a food chain with man as the final consumer. |
| D. | It is made up of many inter- connecting food chains. |
| Answer» E. | |
| 464. |
The insects, butterflies, honeybees and birds help flowering plants in which of the following processes? |
| A. | Fertilization |
| B. | Pollination |
| C. | Cultivation |
| D. | Conservation |
| Answer» C. Cultivation | |
| 465. |
Which of the following is NOT a consequence of deforestation? |
| A. | Increased levels of ground water. |
| B. | Removal of the top layer of soil by wind. |
| C. | Increased levels of carbon dioxide in the atmosphere. |
| D. | Destruction of the natural habitats of plants and animals. |
| Answer» B. Removal of the top layer of soil by wind. | |
| 466. |
Which of the following are called green lungs? |
| A. | Mountains |
| B. | Oceans |
| C. | Forests |
| D. | Rivers |
| Answer» D. Rivers | |
| 467. |
How does our government protect the rainforests of our country? (i) Prohibits the felling of trees. (ii) Tress that have been chopped down are replanted. (iii) Discourages the use of pesticides in agriculture |
| A. | (i) and (ii) only |
| B. | (i) and (iii) only |
| C. | (ii) and (iii) only |
| D. | (i), (ii) and (iii) |
| Answer» B. (i) and (iii) only | |
| 468. |
Under which headings can flora and fauna be considered? |
| A. | Renewable and non-living resources. |
| B. | Non-renewable and living resources. |
| C. | Living resources. |
| D. | Non-renewable and non-living resources. |
| Answer» D. Non-renewable and non-living resources. | |
| 469. |
Which of the following processes is/are prevented by step farming? |
| A. | Soil erosion |
| B. | Deforestation |
| C. | Afforestation |
| D. | All of these |
| Answer» B. Deforestation | |
| 470. |
Which of the following include all living organisms and all life supporting regions of the earth? |
| A. | Biosphere |
| B. | Ionosphere |
| C. | Stratosphere |
| D. | Lithosphere |
| Answer» B. Ionosphere | |
| 471. |
In any food chain the largest population is that of which of the following organisms? |
| A. | Producers |
| B. | Consumer |
| C. | Decomposers |
| D. | Parasite |
| Answer» B. Consumer | |
| 472. |
Plants and animals maintain the balance of oxygen and carbon dioxide in the air. Which of the following processes represents X and Y? |
| A. | X Y Respiration Transpiration |
| B. | X Y Transpiration Decay |
| C. | X Y Photosynthesis Respiration |
| D. | X Y Decay Photosynthesis |
| Answer» D. X Y Decay Photosynthesis | |
| 473. |
Which of the following must be practised to preserve and conserve the environment? |
| A. | Deforestation |
| B. | Recycling and afforestation |
| C. | Soil erosion |
| D. | Increase in pollution |
| Answer» C. Soil erosion | |
| 474. |
Which of the following consequences is/ are due to uncontrolled deforestation? (i) The destruction of habitats (ii) Landslides (iii) Flooding |
| A. | (i) only |
| B. | (i) and (ii) only |
| C. | (ii) and (iii) only |
| D. | (i), (ii) and (iii) |
| Answer» E. | |
| 475. |
Water vapour is returned to the atmosphere through which of the following processes? (i) Respiration carried out by living organisms. (ii) Transpiration carried out by living organism (iii) The evaporation of water from ponds, lakes and seas. |
| A. | (i)only |
| B. | (ii) and (iii) only |
| C. | (i) and (iii) only |
| D. | (i), (ii) and (iii) |
| Answer» E. | |
| 476. |
What is the bird called in the given food chain? \[Grass\to Grasshoppers\to Birds\to Snakes\] |
| A. | Producer |
| B. | Parasite |
| C. | Decomposer |
| D. | Consumer |
| Answer» E. | |
| 477. |
In which of the following groups of animals vultures and jackals are included? |
| A. | Herbivores |
| B. | Decomposers |
| C. | Scavengers |
| D. | Parasites |
| Answer» D. Parasites | |
| 478. |
Which of the following converts the dead plants and animals into minerals? |
| A. | Chemicals |
| B. | Scavengers |
| C. | Decomposers |
| D. | Consumers |
| Answer» D. Consumers | |
| 479. |
Which process is responsible for the release of carbon dioxide by animals? |
| A. | Respiration |
| B. | Digestion |
| C. | Photosynthesis |
| D. | Reproduction |
| Answer» B. Digestion | |
| 480. |
Which process in plants is responsible for the release of oxygen? |
| A. | Respiration |
| B. | Digestion |
| C. | Photosynthesis |
| D. | Reproduction |
| Answer» D. Reproduction | |
| 481. |
Which of the following is the use of forests to an environment? |
| A. | Forest prevent diseases. |
| B. | Forest prevent rainfall. |
| C. | Forest promote soil erosion. |
| D. | Forest prevent floods. |
| Answer» E. | |
| 482. |
What is a long-term effect of clearing of larger areas of rain forest? |
| A. | Decreased carbon dioxide content in the air. |
| B. | Decreased flooding of low-lying land. |
| C. | Increased rainfall in these areas. |
| D. | Increased rate of soil erosion. |
| Answer» E. | |
| 483. |
In nature there is an interdependence between plants and animals for food, oxygen and carbon dioxide. Which of the following conclusions is true about the given statement? |
| A. | Some day all the oxygen will be used up by the animals. |
| B. | Some day all the carbon dioxide will be used up by the plants. |
| C. | The amount of oxygen is increasing and that of carbon dioxide is decreasing in our atmosphere. |
| D. | The level of oxygen and carbon dioxide in the atmosphere is kept constant. |
| Answer» E. | |
| 484. |
Which of the following should come in the empty box in the food chain given below? |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» C. | |
| 485. |
Which of the following plays an important role in causing rainfall? |
| A. | Animals |
| B. | Plants |
| C. | Factories |
| D. | Vehicles |
| Answer» C. Factories | |
| 486. |
When we destroy a forest which of the following is destroyed? |
| A. | An ecosystem. |
| B. | The plant life only. |
| C. | Population of wild life only. |
| D. | Food and shelter of wild animals only. |
| Answer» B. The plant life only. | |
| 487. |
Which of the following are the two components of an ecosystem? |
| A. | Plants and animals only |
| B. | Trees and fungi only |
| C. | Living and nonliving |
| D. | Frogs and man only |
| Answer» D. Frogs and man only | |
| 488. |
Which of the following trees would be most suitable for growing along a walkway? |
| A. | A and C |
| B. | A and B |
| C. | B and C |
| D. | A and D |
| Answer» E. | |
| 489. |
Observe the given diagram of tree Which of these statements best explains the shape of the given tree? |
| A. | Trees that have very thick trunk have such crowns. |
| B. | The branches spread out so that they receive enough sunlight and can be home to many animals. |
| C. | The leaves are spread out not to receive as much sunlight as possible. |
| D. | The branches spread the leaves so as to protect trees from predators. |
| Answer» C. The leaves are spread out not to receive as much sunlight as possible. | |
| 490. |
Which of the following groups consists of a decomposer, a producer and a predator respectively? |
| A. | Grass, goat and eagle. |
| B. | Mould, sugarcane and lizard. |
| C. | Papaya plant, caterpillar and bird. |
| D. | Toad stool, rotting log and earth-worm. |
| Answer» C. Papaya plant, caterpillar and bird. | |
| 491. |
Study the food chain given below. \[M\to N\to O\to P\to Q\] What will be the immediate impact if the population of 'P' is wiped out due to an illness? |
| A. | M, N, O and Q will also die. |
| B. | The population of Q will decrease. |
| C. | The population of Q will decrease. |
| D. | The population of Q will increase. |
| Answer» C. The population of Q will decrease. | |
| 492. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 3 The phenomenon of formation of new individuals from existing ones to increase the population is called reproduction. Reproduction can be broadly grouped into two types: asexual reproduction and sexual reproduction The mode of reproduction in which an individual produces offspring with the help of another individual is called: |
| A. | sexual reproduction |
| B. | asexual reproduction |
| C. | tissue culture |
| D. | fertilization |
| Answer» B. asexual reproduction | |
| 493. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 3 The phenomenon of formation of new individuals from existing ones to increase the population is called reproduction. Reproduction can be broadly grouped into two types: asexual reproduction and sexual reproduction Vegetative reproduction is |
| A. | a sexual reproduction |
| B. | an asexual reproduction |
| C. | a pollination |
| D. | a type of fertilization |
| Answer» C. a pollination | |
| 494. |
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. In self pollination |
| A. | the pollen of a flower lands on anther of the same flower |
| B. | the pollen of a flower lands on stigma of a different flower on the same plant |
| C. | the pollen of a flower lands on stigma of the same flower |
| D. | none of the above is correct |
| Answer» D. none of the above is correct | |
| 495. |
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. In cross pollination |
| A. | the pollen of a flower lands on the stigma of another flower of the same plant |
| B. | the pollen of a flower lands on the stigma of another flower of a different plant of the same kind. |
| C. | both the above are correct |
| D. | none of these is correct |
| Answer» D. none of these is correct | |
| 496. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 1 The cell which results after fusion of gametes is called a zygote. The fusion of male and female gametes (to form a zygote) is called fertilization. The zygote develops into an embryo. The part of the flower which produce male gametes is called |
| A. | Anther |
| B. | Stamen |
| C. | filament |
| D. | none of these |
| Answer» B. Stamen | |
| 497. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 1 The cell which results after fusion of gametes is called a zygote. The fusion of male and female gametes (to form a zygote) is called fertilization. The zygote develops into an embryo. The cell which results after fusion of male gametes and female gametes is called |
| A. | zygote |
| B. | fertilization |
| C. | embryo |
| D. | none of these |
| Answer» B. fertilization | |
| 498. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 1 The cell which results after fusion of gametes is called a zygote. The fusion of male and female gametes (to form a zygote) is called fertilization. The zygote develops into an embryo. Zygote formation occurs in |
| A. | asexual reproduction |
| B. | sexual reproduction |
| C. | both asexual and sexual reproduction |
| D. | all the above are correct |
| Answer» C. both asexual and sexual reproduction | |
| 499. |
DIRECTION: Match column I with column II and select the correct answers using the code given below the columns. Column-I Column-II (A) Node (i) Part of the stem from which a leaf arises (B) Axil (ii) Point of attachment of leaf at node (C) roots (iii) can give rise to new plants in Dahliya (D) Bryophyllum (iv) Sprout leaf plant |
| A. | (A) \[\to \] (i),(B) \[\to \] (ii),(C) \[\to \] (iii),(D) \[\to \] (iv) |
| B. | (A) \[\to \] (ii),(B) \[\to \] (iii),(C) \[\to \] (iv),(D) \[\to \] (i) |
| C. | (A) \[\to \] (iii),(B) \[\to \] (iv),(C) \[\to \] (i),(D) \[\to \] (ii) |
| D. | (A) \[\to \] (iv),(B) \[\to \] (iii),(C) \[\to \] (ii),(D) \[\to \] (i) |
| Answer» B. (A) \[\to \] (ii),(B) \[\to \] (iii),(C) \[\to \] (iv),(D) \[\to \] (i) | |
| 500. |
DIRECTION: Match column I with column II and select the correct answers using the code given below the columns. Column-I Column-II (A) Fragmentation (i) Found in Potato (B) Spores (ii) Short stem around which immature developing leaves are folded (C) Bud (iii) fungi on a bread grow from them (D) Eye (iv) Process by which algae grow and multiply rapidly |
| A. | (A) \[\to \] (i),(B) \[\to \] (ii),(C) \[\to \] (iii),(D) \[\to \] (iv) |
| B. | (A)\[\to \](ii),(B)\[\to \](iii),(C)\[\to \](iv),(D) \[\to \] (i) |
| C. | (A)\[\to \](iii),(B)\[\to \](iv),(C)\[\to \](i),(D)\[\to \](ii) |
| D. | (A)\[\to \](iv),(B)\[\to \](iii),(C)\[\to \](ii),(D)\[\to \](i) |
| Answer» E. | |