MCQOPTIONS
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MCQOPTIONS
This section includes 6820 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 701. |
What is the cause of iron deficiency disease among the workers working in iron mines? |
| A. | lead |
| B. | Mercury |
| C. | cadmium |
| D. | silica |
| Answer» E. | |
| 702. |
Water pollution in rivers is measured by? |
| A. | from the dissolved amount of Cl |
| B. | by dissolved amount of O₃ |
| C. | from the dissolved amount of H₂ |
| D. | from the dissolved quantity of O |
| Answer» E. | |
| 703. |
Is the Taj Mahal getting damaged? |
| A. | flood in yamuna |
| B. | decomposition of marble at high temperature |
| C. | From air pollutants released from Mathura oil refinery |
| D. | none of the above |
| Answer» D. none of the above | |
| 704. |
D . D . t happens? |
| A. | Antibiotics |
| B. | biodegradable pollutants |
| C. | non-biodegradable pollutants |
| D. | none of the above |
| Answer» D. none of the above | |
| 705. |
Humans die in the atmosphere of carbon monoxide? |
| A. | It combines with O₂ existing in the body to form CO₂. |
| B. | It catabolizes the organic fluid present in the tissues. |
| C. | It combines with the hemoglobin of the blood to make the blood incapable of absorbing oxygen. |
| D. | it dries up the blood |
| Answer» D. it dries up the blood | |
| 706. |
What is a reliable indicator of air pollutants? |
| A. | ferns and cycas |
| B. | green algae and liverwort |
| C. | lichens and moss |
| D. | Neem and sea soak |
| Answer» D. Neem and sea soak | |
| 707. |
What are the gases called green house gases? |
| A. | CO , O₂ , NO , SMALL |
| B. | CFC , COO , SMALL , FEMALE |
| C. | ONLY , H , CO , SMALL |
| D. | CFC, CO₂, CN₄, NO₂ |
| Answer» E. | |
| 708. |
What is meant by self ecology? |
| A. | effect of soil on vegetation |
| B. | ecological study of individual organisms |
| C. | effect of excitation on vegetation |
| D. | effect of temperature on vegetation |
| Answer» C. effect of excitation on vegetation | |
| 709. |
Food chain is formed? |
| A. | producers, consumers and decomposers |
| B. | producers, carnivores and decomposers |
| C. | producers and primary consumers |
| D. | producers, vegetarians and non-vegetarians |
| Answer» B. producers, carnivores and decomposers | |
| 710. |
Which of the following is a softening factor of the atmosphere |
| A. | soil water |
| B. | soil air |
| C. | Minerals |
| D. | all these |
| Answer» E. | |
| 711. |
The formation of carbon dioxide in the atmosphere is mainly caused by? |
| A. | by forest fire |
| B. | by living organisms |
| C. | by micro-organisms |
| D. | from factory smoke |
| Answer» C. by micro-organisms | |
| 712. |
What is the correct definition of ecosystem? |
| A. | a community of organisms that interact with each other |
| B. | abiotic components of a habitat |
| C. | a part of the earth the community of organisms in which they live |
| D. | community of organisms with the environment in which they live |
| Answer» E. | |
| 713. |
Which of the following is a measure of the amount of oxygen required for the decomposition of biodegradable organic matter by aerobic organic decomposers in a sample of water? |
| A. | Biomedical Oxygen Demand |
| B. | Biochemical Oxygen Demand |
| C. | Biomechanical Oxygen Demand |
| D. | none of the above |
| Answer» C. Biomechanical Oxygen Demand | |
| 714. |
The vertebrates have a long root system because |
| A. | They provide mechanical power to the plants. |
| B. | Water from deeper water levels goes into the depth associated with absorbing it. |
| C. | High soil temperature encourages root growth. |
| D. | Low nighttime temperatures encourage root growth |
| Answer» C. High soil temperature encourages root growth. | |
| 715. |
In the interrelationship of two or more living beings, one organism benefits, but if there is loss of any two, then this relationship is called? |
| A. | cooperation |
| B. | symbiosis |
| C. | cooperation |
| D. | Benevolence |
| Answer» D. Benevolence | |
| 716. |
Hydroponics is related to? |
| A. | plant growth without soil |
| B. | plant growth without water |
| C. | The relation of sound to water |
| D. | water conservation technology |
| Answer» B. plant growth without water | |
| 717. |
What is the primary or main source of energy in an ecosystem? |
| A. | sunlight |
| B. | sugar stored in plants |
| C. | free heat in fermentation |
| D. | heat released during respiration |
| Answer» B. sugar stored in plants | |
| 718. |
What is the largest number in an ecosystem? |
| A. | of primary producers |
| B. | of primary consumers |
| C. | of secondary consumers |
| D. | of the decomposer |
| Answer» B. of primary consumers | |
| 719. |
Who propounded the concept of ecology? |
| A. | C . C . the park |
| B. | by Grenell |
| C. | by Darwin |
| D. | e . P . by odm |
| Answer» C. by Darwin | |
| 720. |
What is the function of producers in an ecosystem? |
| A. | converting organic compounds into inorganic compounds |
| B. | capture solar energy and convert it into chemical energy |
| C. | harness chemical energy |
| D. | release energy |
| Answer» C. harness chemical energy | |
| 721. |
What is the vegetation of the seashore called? |
| A. | saline plant |
| B. | aphrodisiac flora |
| C. | alluvial vegetation |
| D. | dioecious vegetation |
| Answer» B. aphrodisiac flora | |
| 722. |
Who does the biggest fixation of solar energy? |
| A. | bacteria |
| B. | protozoa |
| C. | fungus |
| D. | Green plants |
| Answer» E. | |
| 723. |
The world's largest ecosystem? |
| A. | grassland |
| B. | big lakes |
| C. | Sea |
| D. | Forest |
| Answer» D. Forest | |
| 724. |
Epiphytes are found in places where . . . |
| A. | the temperature is too low |
| B. | oxygen concentration is high |
| C. | it rains all year round |
| D. | rainfall depends on the season |
| Answer» D. rainfall depends on the season | |
| 725. |
Can soil erosion be stopped? |
| A. | by overgrazing |
| B. | by vegetative eradication |
| C. | by afforestation |
| D. | by increasing bird numbers |
| Answer» D. by increasing bird numbers | |
| 726. |
What are the two components of biological environment? |
| A. | weeds and trees |
| B. | biotic and non-living |
| C. | Frogs and Humans |
| D. | plants and animals |
| Answer» E. | |
| 727. |
The study of the interaction between living organisms and their environment is called? |
| A. | plant geography |
| B. | ecology |
| C. | plant social science |
| D. | Ecosystem |
| Answer» C. plant social science | |
| 728. |
is chromatid? |
| A. | complete chromosome |
| B. | half-chromosome |
| C. | RNA |
| D. | DNA |
| Answer» C. RNA | |
| 729. |
What is the substance found in more than 80 percent of the cell? |
| A. | protein |
| B. | fat |
| C. | minerals |
| D. | water |
| Answer» E. | |
| 730. |
Provided the term chromosome? |
| A. | Hoffmeister |
| B. | Voltaire |
| C. | by Sutton |
| D. | Wagner |
| Answer» C. by Sutton | |
| 731. |
What is the cellular and molecular control ofprogrammed cell deathcalled? |
| A. | apoptosis |
| B. | degeneration |
| C. | Aging |
| D. | necrosis |
| Answer» C. Aging | |
| 732. |
If all the plants of the world die, then because of whose deficiency will all the animals die? |
| A. | oxygen |
| B. | wood |
| C. | cold air |
| D. | meal |
| Answer» B. wood | |
| 733. |
What is the inner fold of mitochondria called? |
| A. | Christie |
| B. | oxisome |
| C. | matrix |
| D. | microsomes |
| Answer» B. oxisome | |
| 734. |
Mangrove vegetation is found in? |
| A. | in Dehradun Valley |
| B. | in Kullu Valley |
| C. | in the Western Ghats |
| D. | in the beautiful forest |
| Answer» E. | |
| 735. |
Where is the Center for Cellular and Molecular Biology located? |
| A. | Mumbai |
| B. | Kolkata |
| C. | Bangalore |
| D. | Hyderabad |
| Answer» E. | |
| 736. |
Which cell organelle is found only in plant cells? |
| A. | cell wall |
| B. | reaper |
| C. | Vacancies |
| D. | all these |
| Answer» E. | |
| 737. |
Where is the largest number of chromosomes found? |
| A. | in sugarcane |
| B. | in potatoes |
| C. | in man |
| D. | in ophioglossum |
| Answer» E. | |
| 738. |
Gives green color to husbands? |
| A. | chromoplast |
| B. | chloroplast |
| C. | Leukoplast |
| D. | tonoplast |
| Answer» C. Leukoplast | |
| 739. |
What is the active site of protein formation? |
| A. | lysosomes |
| B. | ribosome |
| C. | mitochondria |
| D. | golgi body |
| Answer» C. mitochondria | |
| 740. |
In which mitochondria are absent? |
| A. | Yeast |
| B. | fungus |
| C. | bacteria |
| D. | green algae |
| Answer» D. green algae | |
| 741. |
The dense network of fine, branched, membranous and irregular tubules present in the cytoplasm is called? |
| A. | golgi body |
| B. | mitochondria |
| C. | ribosome |
| D. | endoplasmic reticulum |
| Answer» E. | |
| 742. |
Which cell organelle plays a major role in protein synthesis? |
| A. | Lysosomes and Centrosomes |
| B. | Endoplasmic Reticulum and Ribosomes |
| C. | Golgi apparatus and mitochondria |
| D. | Lysosomes and Mitochondria |
| Answer» C. Golgi apparatus and mitochondria | |
| 743. |
What is the active site of cellular respiration? |
| A. | golgi body |
| B. | mitochondria |
| C. | ribosome |
| D. | lysosomes |
| Answer» C. ribosome | |
| 744. |
Which of the following is the largest cell organelle? |
| A. | chromosome |
| B. | mitochondria |
| C. | plastid |
| D. | golgi body |
| Answer» D. golgi body | |
| 745. |
Invented the electron microscope? |
| A. | Knoll and Ruska |
| B. | Fleming and Brown |
| C. | Fleming and Brown |
| D. | Watson and Crick |
| Answer» B. Fleming and Brown | |
| 746. |
Presented the format of DNA boiling helix? |
| A. | Knoll and Ruska |
| B. | Watson and Crick |
| C. | Khurana has |
| D. | Priestley |
| Answer» C. Khurana has | |
| 747. |
Which of the following functions would not be performed in the absence of ribosomes in the cell? |
| A. | respiration |
| B. | emissions |
| C. | protein synthesis |
| D. | carbohydrate synthesis |
| Answer» D. carbohydrate synthesis | |
| 748. |
Indoor lattice discovered? |
| A. | by Sutton |
| B. | the porter |
| C. | Watson |
| D. | By Roberts |
| Answer» C. Watson | |
| 749. |
The enzyme found in the lysosome which has the ability to dissolve or destroy the protoplasm is called? |
| A. | cell sap |
| B. | Cytoplasm |
| C. | nucleoplasm |
| D. | hydrolysine enzyme |
| Answer» E. | |
| 750. |
Who among the following proposed the basic concept that all organisms are made up of cells? |
| A. | Pasteur |
| B. | slideden |
| C. | robert hook |
| D. | T. dog |
| Answer» E. | |