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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.
| 1651. |
The direction of flow of heat is |
| A. | always from hotter body to a cooler body |
| B. | always from cooler body to a hotter body. |
| C. | always from a body at a lower temperature to a body at higher temperature |
| D. | All of the above |
| Answer» B. always from cooler body to a hotter body. | |
| 1652. |
Direction: Read the given experiment and answer the following questions.Paper pins are stuck to a metal rod with wax and a lighted candle is kept below the rod as shown in the diagram below. Which one of the paper pins will fall off the metal rod first? |
| A. | P |
| B. | O |
| C. | R |
| D. | S |
| Answer» B. O | |
| 1653. |
Which of the following conditions enables heat to flow from one body to another identical body? |
| A. | The difference in the temperatures of the two bodies |
| B. | The difference in the pressures exerted on the two bodies |
| C. | The difference in the densities of the two bodies |
| D. | The difference in the sizes of the two bodies |
| Answer» B. The difference in the pressures exerted on the two bodies | |
| 1654. |
DIRECTIONS: Read the following two statements carefully and choose the correct options. (i) Forests provide medicines, timber etc. (ii) Forests maintain moisture (iii) Forests prevent soil erosion |
| A. | Statements (i) and (iii) are incorrect but (ii) is correct. |
| B. | Statements (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. | |
| 1655. |
DIRECTIONS: Read the following two statements carefully and choose the correct options. (i) Forests act as water purifier (ii) Forests act as air purifier (iii) Forests provide food and shelter to animals |
| A. | Statements (i) and (iii) are incorrect but (ii) is correct. |
| B. | Statements (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. | |
| 1656. |
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 an animal dies in the forest, it becomes food for vultures, crows Jackals and insects. Reason (R): There is no waste in forests. |
| 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. | |
| 1657. |
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): All animals depend ultimately on plants for food. Reason (R): Organisms which feed on plants afterwards get eaten by other organisms and soon. |
| 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. | |
| 1658. |
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): Different layers of vegetation are a source of food and shelter for animals, birds and insects Reason (R): The animals like boar, bison, Jackals and elephants live in deeper areas of forests. |
| 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. | |
| 1659. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 2 Deforestation began by clearing forests so that crops could be grown. Forests serve as water purifier system in nature. Forests are good source of plants, we should not destroy the forests. Which of the following activities cause destruction of ecosystem? |
| A. | deforestation |
| B. | A forestation |
| C. | Cultivation |
| D. | none of these |
| Answer» B. A forestation | |
| 1660. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 2 Deforestation began by clearing forests so that crops could be grown. Forests serve as water purifier system in nature. Forests are good source of plants, we should not destroy the forests. Forests prevent ______ |
| A. | soil erosion |
| B. | rain |
| C. | flood |
| D. | Both (a) and (c) |
| Answer» E. | |
| 1661. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 2 Deforestation began by clearing forests so that crops could be grown. Forests serve as water purifier system in nature. Forests are good source of plants, we should not destroy the forests. What is a forest? |
| A. | a big area |
| B. | an ecosystem |
| C. | trees |
| D. | a place where animals live |
| Answer» C. trees | |
| 1662. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 1 Plants and animals are interdependent on each other. Plants give out oxygen which animals take in during respiration. What will happen if more plants are cut? |
| A. | animals will die |
| B. | less \[C{{O}_{2}}\] will be released |
| C. | number of animals will increase |
| D. | nothing will happen |
| Answer» B. less \[C{{O}_{2}}\] will be released | |
| 1663. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 1 Plants and animals are interdependent on each other. Plants give out oxygen which animals take in during respiration. By observing the interdependence we can say that |
| A. | Someday all the \[{{O}_{2}}\] will be used up by animals. |
| B. | Someday all the \[C{{O}_{2}}\] will be used up by plants |
| C. | The amount of \[{{O}_{2}}\] is increasing and that of \[C{{O}_{2}}\]is decreasing in our atmosphere. |
| D. | The level of \[{{O}_{2}}\] and \[C{{O}_{2}}\] in the atmosphere is kept constant. |
| Answer» E. | |
| 1664. |
DIRECTIONS: Match Column I with column II and select the correct answers using the code given below the columns. Column-I Column-II (A) Photosynthesis (p) release of \[\text{C}{{\text{O}}_{\text{2}}}\] (B) Respiration (q) forest, ocean (C) Ecosystem (r) release of \[{{\text{O}}_{\text{2}}}\] (D) Deforestation (s) cutting of trees |
| A. | (A) \[\to \] (p),(B) \[\to \] (r),(C) \[\to \] (p),(D) \[\to \] (s) |
| B. | (A) \[\to \] (p),(B) \[\to \] (r),(C) \[\to \] (s),(D) \[\to \] (q) |
| C. | (A) \[\to \] (r),(B) \[\to \] (p),(C) \[\to \] (s),(D) \[\to \] (q) |
| D. | (A) \[\to \] (r),(B) \[\to \] (p),(C) \[\to \] (q),(D) \[\to \] (s) |
| Answer» E. | |
| 1665. |
DIRECTIONS: Match Column I with column II and select the correct answers using the code given below the columns. Column-I Column-II (A) Autotroph (p) mushroom (B) Saprotroph (q) bacteria (C) Decomposer (r) non green plants & animals (D) Heterotroph (s) green plants |
| A. | (A) \[\to \] (s),(B) \[\to \] (p),(C) \[\to \] (q),(D) \[\to \] (r) |
| B. | (A) \[\to \] (p),(B) \[\to \] (s),(C) \[\to \] (r),(D) \[\to \] (q) |
| C. | (A) \[\to \] (r),(B) \[\to \] (q),(C) \[\to \] (p),(D) \[\to \] (s) |
| D. | (A) \[\to \] (s),(B) \[\to \] (p),(C) \[\to \] (r),(D) \[\to \] (q) |
| Answer» B. (A) \[\to \] (p),(B) \[\to \] (s),(C) \[\to \] (r),(D) \[\to \] (q) | |
| 1666. |
Which of the following provides nutrients to the seedlings to grow in forests? |
| A. | bacteria |
| B. | fungi |
| C. | decaying animal dung |
| D. | Beetles and grubs |
| Answer» D. Beetles and grubs | |
| 1667. |
Animals that depend upon food produced by autotrophs are called |
| A. | herbrivores |
| B. | carnivores |
| C. | saprophyte |
| D. | heterotrophs |
| Answer» B. carnivores | |
| 1668. |
Which of the following leads to the destruction of ecosystem? |
| A. | Soil erosion |
| B. | deforestation |
| C. | Both (a) and (b) |
| D. | Neither (a) nor (d) |
| Answer» D. Neither (a) nor (d) | |
| 1669. |
Loss of top soil is called _______ . |
| A. | corrosion |
| B. | erosion |
| C. | washing |
| D. | denudation |
| Answer» C. washing | |
| 1670. |
The air we breathe out contains more |
| A. | oxygen |
| B. | carbon dioxide |
| C. | water |
| D. | dust particles |
| Answer» C. water | |
| 1671. |
Mushrooms eat ______ |
| A. | rice |
| B. | wax |
| C. | humus |
| D. | wheat |
| Answer» D. wheat | |
| 1672. |
If plants stop releasing oxygen into the atmosphere which of the following might happen? |
| A. | Number of plants will increase |
| B. | Number of animals will increase |
| C. | Animals will die |
| D. | Plants will become healthier |
| Answer» D. Plants will become healthier | |
| 1673. |
Which of the following binds the soil together? |
| A. | Rocks |
| B. | Trees |
| C. | Layers of soil |
| D. | Water |
| Answer» C. Layers of soil | |
| 1674. |
Highest quantity of energy occurs in the |
| A. | primary producers |
| B. | herbivores |
| C. | carnivores |
| D. | decomposers |
| Answer» B. herbivores | |
| 1675. |
Greenhouse effect causes |
| A. | melting of ice caps |
| B. | rising of sea levels |
| C. | submerging of low lying areas |
| D. | All of these |
| Answer» E. | |
| 1676. |
Vultures and jackals are |
| A. | herbivores |
| B. | Carnivores |
| C. | Scavengers |
| D. | Decomposers |
| Answer» D. Decomposers | |
| 1677. |
Which of the following feed upon dead plant and animal tissues? |
| A. | Spirogyra |
| B. | Chlorella |
| C. | Mushroom |
| D. | Chlamydomonas |
| Answer» D. Chlamydomonas | |
| 1678. |
Which of the following is called green lungs? |
| A. | green colored lungs |
| B. | Lungs with green alga |
| C. | Lungs in green colored animals |
| D. | Forests |
| Answer» E. | |
| 1679. |
Which of the following convert the dead plants and animals to humus? |
| A. | chemicals |
| B. | scavengers |
| C. | Decomposers |
| D. | Consumers |
| Answer» D. Consumers | |
| 1680. |
Floods can be controlled by |
| A. | constructing pits |
| B. | forests |
| C. | constructing temporary shelters |
| D. | By allowing water to flow into sea. |
| Answer» C. constructing temporary shelters | |
| 1681. |
In an ecosystem, the population of |
| A. | secondary consumers is large |
| B. | primary consumers is large |
| C. | decomposers is large |
| D. | producers is large than consumers |
| Answer» D. producers is large than consumers | |
| 1682. |
Which of the following is a canopy? |
| A. | shrubs |
| B. | short trees |
| C. | toll trees |
| D. | None of these |
| Answer» D. None of these | |
| 1683. |
A food chain will not begin in the absence of |
| A. | bacteria |
| B. | fungi |
| C. | green plants |
| D. | animals |
| Answer» D. animals | |
| 1684. |
Soil erosion can easily occur due to |
| A. | rain or floods |
| B. | high velocity winds |
| C. | deforestation |
| D. | All of these |
| Answer» E. | |
| 1685. |
DIRECTIONS: Carefully observe pictures given below and answer the following questions. What could arrow 1 and 2 represent in the above diagram? |
| A. | Oxygen, nitrogen |
| B. | carbon dioxide, oxygen |
| C. | oxygen, carbon dioxide |
| D. | energy, water |
| Answer» D. energy, water | |
| 1686. |
DIRECTIONS: Carefully observe pictures given below and answer the following questions. Look at the following diagram and answer the following questions. What does the diagram represent? |
| A. | life cycle of frog |
| B. | an ecosystem |
| C. | a food chain |
| D. | a population |
| Answer» D. a population | |
| 1687. |
DIRECTIONS: Read the following two statements carefully and choose the correct options. (i) Ecosystem means a community of organisms living together with the environments. (ii) Sun is the ultimate source of energy |
| 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. | |
| 1688. |
DIRECTIONS: Read the following two statements carefully and choose the correct options. (i) The branchy part of a tree is canopy (ii) Shrubs and short trees form a crown. |
| 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. | |
| 1689. |
DIRECTIONS: Read the following two statements carefully and choose the correct options. (i) In an ecosystem, number of producers should be more than consumers. (ii) Number of decomposers should be large. |
| 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. | |
| 1690. |
Forests are also called |
| A. | green lungs |
| B. | red kidney |
| C. | brown heart |
| D. | black skin |
| Answer» B. red kidney | |
| 1691. |
DIRECTIONS: The questions in this segment consists of two statements, one labeled as "Assertion A" and the other labeled 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): Forests do not influence the climate and water cycle. Reason (R): Forests do not bring rain |
| 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. | |
| 1692. |
DIRECTIONS: The questions in this segment consists of two statements, one labeled as "Assertion A" and the other labeled 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): Deforestation destroys an ecosystem Reason (R): A forest is cleared to cultivate crops |
| 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. | |
| 1693. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 3 Mushrooms and other micro-organisms that live in the soil feed upon dead plant and animal tissues and are known as decomposers. These micro-organisms play an important role in forests. The humus, a dark coloured substance, is produced by decomposers. A layer of humus is found if we remove some dead leaves from the soil in forests. The presence of humus ensures that nutrients from dead plants and animals are released into the soil. Temperature at place 'A' is high most of the time. Place 'A' also has a heavy rainfall on most of the days. The climate of 'A' is |
| A. | hot |
| B. | hot and dry |
| C. | hot and wet |
| D. | none of these |
| Answer» D. none of these | |
| 1694. |
DIRECTIONS: The questions in this segment consists of two statements, one labeled as "Assertion A" and the other labeled 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): A Food chain will never begin if there are no green plants. Reason (R): Green plants produce food by the process of photosynthesis. |
| 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. | |
| 1695. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 3 Mushrooms and other micro-organisms that live in the soil feed upon dead plant and animal tissues and are known as decomposers. These micro-organisms play an important role in forests. The humus, a dark coloured substance, is produced by decomposers. A layer of humus is found if we remove some dead leaves from the soil in forests. The presence of humus ensures that nutrients from dead plants and animals are released into the soil. Mushroom |
| A. | can be seen under a hand lens over decaying leaves |
| B. | can be seen under a hand lens over the leaves of living plants |
| C. | both the above are correct |
| D. | none of these is correct |
| Answer» B. can be seen under a hand lens over the leaves of living plants | |
| 1696. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 3 Mushrooms and other micro-organisms that live in the soil feed upon dead plant and animal tissues and are known as decomposers. These micro-organisms play an important role in forests. The humus, a dark coloured substance, is produced by decomposers. A layer of humus is found if we remove some dead leaves from the soil in forests. The presence of humus ensures that nutrients from dead plants and animals are released into the soil. Humus |
| A. | is a dark coloured substance. |
| B. | is produced by micro-organisms. |
| C. | is produced by decomposers. |
| D. | all the above are correct. |
| Answer» E. | |
| 1697. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 3 Mushrooms and other micro-organisms that live in the soil feed upon dead plant and animal tissues and are known as decomposers. These micro-organisms play an important role in forests. The humus, a dark coloured substance, is produced by decomposers. A layer of humus is found if we remove some dead leaves from the soil in forests. The presence of humus ensures that nutrients from dead plants and animals are released into the soil. When the nutrients are recycled in forests, |
| A. | There is no wastage in forests |
| B. | The nutrients are again absorbed by the roots of living plants. |
| C. | Both the above are correct |
| D. | None of the above is correct. |
| Answer» D. None of the above is correct. | |
| 1698. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 2 The forest floor provides favorable conditions for seed produced by trees to germinate and develop into seedlings and saplings. Some grow into trees. The branchy part of a tree above the stem is known as crown. The branches of the tall trees look like a roof over the other plants in the forest. This is called canopy The branchy part of a tree above the stem is known as |
| A. | trunk |
| B. | tusker |
| C. | crown |
| D. | canopy |
| Answer» D. canopy | |
| 1699. |
Identify the wrong statement. |
| A. | soil helps forests to grow and regenerate |
| B. | forests influence climatic and water cycle. |
| C. | forest protect the soil from erosion |
| D. | plants and animals in a forest are not dependent on each other. |
| Answer» E. | |
| 1700. |
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 1 Forests are a useful natural resource for us. Forests serve as green lungs and water purifying systems in nature. Forests provide shelter to many animals, birds and insects. Many animals like boar, bison, and jackal elephant live in the deeper areas of forests. And forests protect us from droughts and floods. Which of the following is correct for forests? |
| A. | They are a useful man made resource. |
| B. | They are a useful natural resource. |
| C. | Both the above are correct. |
| D. | None of these is correct. |
| Answer» C. Both the above are correct. | |