NEET Biology Class 7 Chapter 4 Life Under A Microscope Multiple Choice Question and Answers

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Life Under A Microscope (Microorganisms) Formative Worksheet

Question 1. Robert Hooke was the first scientist who coined the term ‘cell’. Which cell did he observe under the microscope?

  1. Fiber
  2. Cork
  3. Root
  4. Leaf

Answer: 2. Cork

Question 2. The range of size of bacteria is

  1. 0.2 to 100 microns
  2. 0.2 to 100 mm
  3. 0.2 to 100 cm
  4. 0.2 to 100 m

Answer: 1. 0.2 to 100 microns

Question 3. Which of the following bacteria is rod-shaped?

  1. Micrococcus
  2. Streptococcus
  3. Sarcina
  4. Lactobacillus

Answer: 4. Lactobacillus

microscope test

Question 4. Which of the following bacteria is ball-shaped?

  1. Micrococcus
  2. Streptococcus
  3. Sarcina
  4. All

Answer: 4. All

NEET Biology Class 7 Life Under a Microscope MCQs

Question 5. Which of the following is absent in a bacterial cell?

  1. Nuclear material
  2. Membrane-bound cell organelles
  3. Cell wall
  4. All

Answer: 2. Membrane-bound cell organelles

Question 6. The nutrition in bacterial

  1. Autotrophic
  2. Heterotrophic
  3. Chemotrophic
  4. All

Answer: Heterotrophic

Question 7. Bacteria are

  1. Aerobes
  2. Anaerobes
  3. Both
  4. None

Answer: 3. Both

microscope test

Question 8. Bacteria reproduce by

  1. Fragmentation
  2. Spore formation
  3. Binary fission
  4. Multiple fission

Answer: 3. Binary fission

Life Under a Microscope NEET MCQs with Answers

Question 9. Which of the following diseases are caused by bacteria?

  1. Cholera
  2. Tuberculosis
  3. AIDS
  4. All

Answer: 4. All

Question 10. Which of the following examples represents a symbiotic relationship between two organisms?

  1. Fungi growing on leather
  2. Lice present on the human head
  3. Cuscuta intertwined on a tree
  4. Rhizobium present in the root of gram

Answer: 4. Rhizobium present in the root of gram

Question 11. Decomposers decompose matter present in dead plants and animals to ammonia. This ammonia is converted into nitrates which are absorbed by plant roots. This process is called nitrification. Ammonia is converted into nitrates with the help of

  1. Bacteria
  2. Fungus
  3. Protists
  4. Viruses

Answer: 1. Bacteria

Question 12. ____1____which are present in the root nodules of a pea plant follow ____2____mode of nutrition. The information in which alternative completes the given statement?

  1. 1 – Cuscuta; 2 – saprotrophic
  2. 1 – Rhizobium; 2 – saprotrophic
  3. 1 – Rhizobium; 2 – symbiotic
  4. 1 – Cuscuta; 2 – symbiotic

Answer: 3. 1 – Rhizobium; 2 – symbiotic

NEET Biology Life Under a Microscope Important MCQs

Question 13. Which of the following microorganisms is capable of fixing atmospheric nitrogen and converting it into some usable nitrogenous compounds?

  1. Fungi
  2. Virus
  3. Bacteria
  4. Protozoa

Answer: 3. Bacteria

Question 14. Lactobacillus is a _____1____ that promotes the formation of ____2____.
The information in which alternative completes the given statement?

  1. 1– bacterium; 2– curd
  2. 1– bacterium; 2– alcohol
  3. 1– fungus; 2– curd
  4. 1– fungus; 2– alcohol

Answer: 1. 1– bacterium; 2– curd

microscope test

Question 15. Rhizobium bacteria are present in the root nodules of leguminous plants such as gram pea. The Rhizobium bacteria present in leguminous plants help in the fixation of

  1. Carbon
  2. Oxygen
  3. Phosphorus
  4. Nitrogen

Answer: 4. Nitrogen

Question 16. Which of the following is a fungus?

  1. Acetobacter
  2. Salmonella
  3. Lactobacillus
  4. Aspergillus

Answer: 4. Aspergillus

Best Multiple Choice Questions for Class 7 Biology Life Under a Microscope

Question 17. Fungi are

  1. Unicellular
  2. Multicellular
  3. Both
  4. None

Answer: 3. Both

Question 18. Mushroom is a type of fungi. Which mode of nutrition is exhibited by mushrooms?

  1. Autotrophic
  2. Insectivorous
  3. Aprotrophic
  4. Parasitic

Answer: 3. Aprotrophic

Question 19. Which of the following organisms exhibits a saprotrophic mode of nutrition?

  1. Mushroom
  2. Rhizobium
  3. Algae
  4. Wheat

Answer: 1. Mushroom

Question 20. Organisms that obtain their food from dead and decaying matter are called saprotrophs. Which of the following organisms has a saprotrophic mode of nutrition?

  1. Mushroom
  2. Rhizobium
  3. Cuscuta
  4. Rose

Answer: 1. Mushroom

Question 21. Potato blight is caused by

  1. Bacteria
  2. Fungi
  3. Virus
  4. Protozoa

Answer: 2. Fungi

Question 22. Asexual reproduction in fungi takes place through

  1. Binary fission
  2. Budding
  3. Fragmentation
  4. All

Answer: 4. All

microscope test

Question 23. Yeast reproduces by

  1. Binary fission
  2. Budding
  3. Fragmentation
  4. Spore formation

Answer: 2. Budding

Question 24. Bread mold reproduces by

  1. Binary fission
  2. Budding
  3. Fragmentation
  4. Spore formation

Answer: 4. Spore formation

Life Under a Microscope Class 7 NEET Objective Questions

Question 25. Which of the following causes diseases in crops?

  1. Puccinia
  2. Microsporium
  3. Arthroderma
  4. Dactylella

Answer: 1. Puccinia

Question 26. Which of the following contains a poison that is deadly to human beings?

  1. Puccinia
  2. Amanita
  3. Arthrobotrys
  4. Dactylella

Answer: 2. Amanita

Question 27. Yeast is commercially used for the preparation of alcohol and ____1____ by the process of _____2______. The information in which alternative completes the given statement?

  1. 1 – wine; 2 – fermentation
  2. 1 – antibiotics; 2 – fermentation
  3. 1 – wine; 2 – aerobic respiration
  4. 1 – antibiotics; 2 – aerobic respiration

Answer: 1. 1 – wine; 2 – fermentation

Question 28. The addition of yeast is responsible for the presence of small holes in bread after it is baked. These holes appear because of the evolution of _____1_____ during _____2_____. Which alternative completes the given statement?

  1. 1 – Carbon dioxide; 2 – Fermentation
  2. 1 – Oxygen; 2 – Fermentation
  3. 1 – Carbon dioxide; 2 – Photosynthesis
  4. 1 – Oxygen; 2 – Photosynthesis

Answer: 1. 1 – Carbon dioxide; 2 – Fermentation

Question 29. Vaccines are not available for which of the following diseases?

  1. Tuberculosis
  2. Hepatitis
  3. Cholera
  4. Malaria

Answer: 4. Malaria

Question 30. Penicillin is an antibiotic that inhibits the growth of bacteria by inhibiting the synthesis of cell walls in them. Penicillin does not have any effect on humans. Which of the following statements is incorrect regarding the given observation?

  1. Penicillin is effective only against bacteria.
  2. Antibiotics target specific biochemical pathways.
  3. Large doses of penicillin will have an effect on humans also.
  4. Humans lack the biochemical pathway in which penicillin acts.

Answer: 3. Large doses of penicillin will have an effect on humans also.

microscope test

Question 31. _____1_____ are weakened or dead microorganisms which, when injected into the body of a healthy person, protect the person from disease-causing microorganisms by initiating the production of ____2______. The information in Which alternative completes the given statement?

  1. 1 – Vaccines; 2 – antibodies
  2. 1 – Vaccines; 2 – antigens
  3. 1 – Antibiotics; 2 – antibodies
  4. 1 – Antibiotics; 2 – antigens

Answer: 1. 1 – Vaccines; 2 – antibodies

Question 32. _____1_____ and ____2____ are examples of antibiotics that are derived from bacteria and fungi. The information in Which alternative completes the given statement?

  1. 1– Glucose; 2 – alcohol
  2. 1– Alcohol; 2– streptomycin
  3. 1– Streptomycin; 2 – tetracycline
  4. 1 – Tetracycline; 2– glucose

Answer: 3. 1– Streptomycin; 2 – tetracycline

NEET Biology Class 7 Chapter 4 MCQs with Solutions

Question 33. _____1_____ prepare their own food by the process of photosynthesis. Therefore, they are known as _____2_____. The information in which alternative completes the given statements?

  1. 1 – Fungi; 2 – autotrophs
  2. 1 – Fungi; 2 – saprotrophs
  3. 1 – Algae; 2 – autotrophs
  4. 1 – Algae; 2 – saprotrophs

Answer: 3. 1 – Algae; 2 – autotrophs

Question 34. Which of the following organisms exhibits a symbiotic relationship?

  1. Mushroom
  2. Lichen
  3. Pitcher plant
  4. Soyabean

Answer: 2. Lichen

Question 35. Lichens exhibit symbiotic relationship between _____1_____ and _____2_____. The information in Which alternative completes the given statement?

  1. 1 – fungus; 2 – alga
  2. 1 – alga; 2 – Rhizobium
  3. 1 – Rhizobium; 2 – soyabean
  4. 1 – soybean; 2 – fungus

Answer: 1. 1 – fungus; 2 – alga

Question 36. Which of the following statements regarding the symbiotic relationship between algae and fungi is correct?

  1. Fungi contain chlorophyll.
  2. Algae manufacture food.
  3. Fungi provide food.
  4. Algae provide water.

Answer: 2. Algae manufacture food.

microscope test

Question 37. Blue-green algae increase the fertility of soil. Which plant nutrient is added to the soil by blue-green algae?

  1. Phosphorus
  2. Potassium
  3. Nitrogen
  4. Calcium

Answer: 3. Nitrogen

NEET Study Material for Life Under a Microscope with MCQs

Question 38. Biological nitrogen fixation is the process of fixation of atmospheric nitrogen into the soil by the action of microorganisms. Examples of biological nitrogen fixers include _____1_____ and _____2_____. The information in which alternative completes the given statement?

  1. 1 – viruses; 2 – fungi
  2. 1 – fungi; 1 – blue-green algae
  3. 1 – blue-green algae; 2 – bacteria
  4. 1 – bacteria; 2 – viruses

Answer: 3. 1 – blue-green algae; 2 – bacteria

Question 39. Which of the following statements about a symbiotic relationship is correct?

  1. It involves a relationship where one organism grows as a parasite on the body of another organism.
  2. It involves a relationship where the two organisms live together and share nutrients.
  3. It is a mode of nutrition where an organism feeds on dead and decaying matter.
  4. It is a mode of nutrition where an organism traps and feeds on insects.

Answer: 2. It involves a relationship where the two organisms live together and share nutrients.

Question 40. The golden-brown microscopic algae, rich in marine places are

  1. Chlamydomonas
  2. Osdllatoria
  3. Laminaria
  4. Diatoms

Answer: 4. Diatoms

Question 41. The ‘jewels of the plant world’ are

  1. Yeasts
  2. Bacteria
  3. Fungi
  4. Diatoms

Answer: 4. Diatoms

Question 42. Which of the following are generally considered to be a great nuisance by many people?

  1. Yeasts
  2. Bacteria
  3. Fungi
  4. Algae

Answer: 4. Algae

Question 43. Which of the following are algae generally used in making glass, toothpaste, filters, and polishing?

  1. Diatoms
  2. Red algae
  3. Brown algae
  4. Blue green algae

Answer: 1. Diatoms

Question 44. Which of the following algae is rich in iodine?

  1. Diatoms
  2. Red algae
  3. Brown algae
  4. Blue green algae

Answer: 3. Brown algae

Question 45. Protozoa are included in

  1. Plant kingdom
  2. Animal kingdom
  3. Both
  4. None

Answer: 2. Animal kingdom

Question 46. Locomotion in protozoans is by

  1. Pseudopodia
  2. Cilia
  3. Flagella
  4. Akk

Answer: 4. Akk

Question 47. Which of the following are harmful?

  1. Amoeba
  2. Paramecium
  3. Entamoeba histolytica
  4. All

Answer: 3. Entamoeba histolytica

Question 48. Sleeping sickness is caused by

  1. Trypanosoma
  2. Paramecium
  3. Entamoeba histolytica
  4. Plasmodium

Answer: 1. Trypanosoma

Question 49. Choose the correct statement.

  1. Protozoa form an important link in aquatic food chains.
  2. Protozoa decompose organic matter and thereby help in converting organic wastes into simpler useful soil nutrients.
  3. Protozoa also exist in symbiotic association with other organisms.
  4. All

Answer: 4. All

microscope test

Question 50. Which of the following is almost closer to a nonliving being?

  1. Protozoa
  2. Bacteria
  3. Virus
  4. Fungi

Answer: 3. Virus

Question 51. Which of the following is a bacterial disease?

  1. Chickenpox
  2. Smallpox
  3. Typhoid
  4. Rabies

Answer: 3. Typhoid

Question 52. Ringworm is caused by

  1. Bacteria
  2. Fungi
  3. Virus
  4. Protozoa

Answer: 2. Fungi

Question 53. Which of the following is caused by protozoans?

  1. Malaria
  2. Dysentery
  3. Sleeping sickness
  4. All

Answer: 4. All

Question 54. Anthrax disease in cattle is caused by

  1. Bacteria
  2. Fungi
  3. Virus
  4. Protozoa

Answer: 4. Protozoa

Life Under A Microscope (Microorganisms) Conceptive Worksheet

Question 1. Robert Hooke coined the term cell. Which part of a plant did Robert Hooke use to observe a cell using a microscope?

  1. Cork
  2. Leaf
  3. Root
  4. Flower

Answer: 1. Cork

Question 2. Which of the following bacteria is spiral-shaped?

  1. Vibrio
  2. Treponema
  3. Camphilovector
  4. All

Answer: 4. All

Question 3. Which of the following is present in disease-producing bacteria?

  1. Nuclear material
  2. Capsule
  3. Cell wall
  4. All

Answer: 2. Capsule

Question 4. Bacteria can be included in

  1. Plants
  2. Animals
  3. Both
  4. None

Answer: 3. Both

Question 5. Severe digestive diseases are caused due to

  1. Acetobacter
  2. Salmonella
  3. Lactobacillus
  4. All

Answer: 2. Salmonella

Question 6. Which of the following nutrients will not be enriched in a soil lacking the presence of bacteria and fungi?

  1. Oxygen
  2. Nitrogen
  3. Carbon dioxide
  4. Sulfur dioxide

Answer: 2. Nitrogen

Question 7. Microorganisms are used in the manufacture of many food products and beverages. Which of the following processes occur during the manufacture of wine by microorganisms?

  1. Respiration
  2. Photosynthesis
  3. Fermentation
  4. Digestion

Answer: 3. Fermentation

microscope test

Question 8. Plants are incapable of taking up nitrogen directly from the atmosphere. Which of the following organisms converts atmospheric nitrogen and makes it available to plants into the soluble form?

  1. Protozoa
  2. Bacteria
  3. Fungi
  4. Virus

Answer: 2. Bacteria

Question 9. Lactobacillus, which is a friendly microorganism, is used in the preparation of which of the following substances?

  1. Curd
  2. Wine
  3. Bread
  4. Alcohol

Answer: 1. Curd

Question 10. The nitrogen cycle helps in the movement of nitrogen within the biosphere. In the nitrogen cycle, soil-nitrifying bacteria help in the

  1. Formation of nitrates
  2. Formation of nitrogen
  3. Absorption of nitrates by plants
  4. Absorption of nitrates by animals

Answer: 1. Formation of nitrates

Question 11. Amit took a bit of a substance X, mounted it on a slide, and viewed it under the microscope. He observed the given organism. Which of the following substances did Amit observe?

NEET Biology Life Under A Microscope Microorganisms MCQs Qestion 11

  1. Milk
  2. Vinegar
  3. Fruit juice
  4. Buttermilk

Answer: 4. Buttermilk

Question 12. Which of the following statements about the nitrogen cycle is incorrect?

  1. Plants can directly absorb nitrogen from the atmosphere.
  2. Nitrogen enters the animal world when it feeds on plants.
  3. Nitrogen returns to the atmosphere by the action of certain bacteria.
  4. Animal waste is converted into nitrogenous compounds by certain bacteria.

Answer: 1. Plants can directly absorb nitrogen from the atmosphere.

Question 13. Mushroom is a

  1. Bacteria
  2. Fungus
  3. Protozoa
  4. Virus

Answer: 2. Fungus

Question 14. Bread molds consist of thread-like structures called

  1. Pseudopodia
  2. Tentacles
  3. Hyphae
  4. Clitellum

Answer: 3. Hyphae

Question 15. Mushroom is a type of fungi. Which of the following statements about fungi is incorrect?

  1. They grow in nutrient-deficient soil.
  2. They consume food in the solution form.
  3. They obtain food from dead and decaying matter.
  4. They secrete digestive juices on dead and decaying matter.

Answer: 1. They grow in nutrient-deficient soil.

Question 16. While having a walk in a garden, Sonia observed numerous mushrooms growing on a piece of wood lying on the ground. Mushrooms obtain nutrition by

  1. Manufacturing their own food
  2. Trapping and feeding on insects
  3. Growing as a parasite on the body of the plant
  4. Feeding on dead and decaying organic matter

Answer: 4. Feeding on dead and decaying organic matter

Life Under a Microscope Class 7 NCERT MCQs with Answer Key

Question 17. The nitrogenous wastes produced by the dead remains of plants and animals are reconverted into nitrogen compounds, which can again be used by plants. Which two organisms convert nitrogenous wastes into nitrogen compounds?

  1. Bacteria and fungi
  2. Fungi and algae
  3. Algae and virus
  4. Virus and bacteria

Answer: 1. Bacteria and fungi

Question 18. Fungi are

  1. Autotrophic
  2. Saprophytic
  3. Parasitic
  4. All

Answer: 2. Saprophytic

Question 19. Wheat rust is caused by

  1. Bacteria
  2. Fungi
  3. Virus
  4. Protozoa

Answer: 2. Fungi

Question 20. The common method of reproduction in fungi is

  1. Binary fission
  2. Budding
  3. Fragmentation
  4. Spore formation

Answer: 4. Spore formation

Question 21. Microsporium causes disease in

  1. Crops
  2. Humans
  3. Animals
  4. None

Answer: 2. Humans

Question 22. Yeast is not used in the preparation of which of the following substances?

  1. Curd
  2. Wine
  3. Bread
  4. Alcohol

Answer: 1. Curd

Question 23. Yeast is used to manufacture alcoholic beverages like wine and beer. It is used in the production of bread. It is also used as a nutrient supplement for human beings. Which of the following processes uses yeast to make wines and breads?

  1. Photosynthesis
  2. Fermentation
  3. Decomposition
  4. Chemosynthesis

Answer: 2. Fermentation

Question 24. Microorganisms are used for producing medicines called antibiotics, which reduce the growth or kill other microorganisms. Which two microorganisms are used in the preparation of antibiotics?

  1. Bacteria and fungi
  2. Fungi and protozoa
  3. Protozoa and viruses
  4. Viruses and bacteria

Answer: 1. Bacteria and fungi

Question 25. Yeast is used in the commercial production of _____1_____ and _____2_____. The information in which alternative completes the given statement?

  1. 1 – vinegar; 2 – alcohol
  2. 1 – alcohol; 2 – oil
  3. 1 – oil; 2 – glucose
  4. 1 – glucose; 2 – vinegar

Answer: 2. 1 – alcohol; 2 – oil

Question 26. ___1___ are substances produced by certain microbes, which inhibit the growth of other microbes while ___2___ are substances that are produced by our body to fight against disease. The information in which alternative completes the given statement?

  1. 1 – antibodies; 2 – antibiotics
  2. 1 – toxins; 2 – antibodies
  3. 1 – antibiotics; 2 – toxins
  4. 1 – antibiotics; 2 – antibodies

Answer: 4. 1 – antibiotics; 2 – antibodies

Question 27. Lichens are organisms that are formed as a result of a symbiotic relationship between two organisms. Which two organisms form a symbiotic relationship in lichens?

  1. Algae and bacteria
  2. Bacteria and plants
  3. Plants and fungi
  4. Fungi and algae

Answer: 4. Fungi and algae

Question 28. Which of the following statements about a symbiotic relationship is correct?

  1. It involves a relationship where one organism grows as a parasite on the body of another organism.
  2. It involves a relationship where the two organisms live together and share nutrients.
  3. It is a mode of nutrition where an organism feeds on dead and decaying matter.
  4. It is a mode of nutrition where an organism traps and feeds on insects.

Answer: 2. It involves a relationship where the two organisms live together and share nutrients.

Question 29. Heterotrophs are organisms that are dependent on plants and other animals for food. Which of the following organisms is not a heterotroph?

  1. Algae
  2. Cuscuta
  3. Mushroom
  4. Earthworm

Answer: 1. Algae

Question 30. Which of the following statements about the nitrogen cycle is correct?

  1. Animals obtain nitrogen directly from the soil.
  2. Plants take nitrogen from the atmosphere through stomata.
  3. Rhizobium converts nitrogen compounds into free nitrogen.
  4. Blue-green algae help in the fixation of free atmospheric nitrogen.

Answer: 4. Blue-green algae help in the fixation of free atmospheric nitrogen.

Question 31. Organisms ‘X’ and ‘Y’ live in close association with each other. ‘X’ depends on ‘Y’ for support and ‘Y’ depends on ‘X’ for its food. Which of the following pairs represents organisms ‘X’ and ‘Y’?

  1. Cuscuta and Peepal tree
  2. Pitcher plant and insect
  3. Fungi and bacteria
  4. Fungi and algae

Answer: 4. Fungi and algae

Question 32. Diatoms are

  1. Unicellular
  2. Colonial
  3. Filamentous
  4. All

Answer: 4. All

Question 33. Which of the following can fix atmospheric nitrogen in the soil?

  1. Diatoms
  2. Red algae
  3. Brown algae
  4. Blue-green algae

Answer: 4. Blue-green algae

Question 34. Which of the following algae are used as food?

  1. Chlorella
  2. Porphyra
  3. Blue-green algae
  4. All

Answer: 1. Chlorella

Question 35. Plasmodium lacks

  1. Cell wall
  2. Chlorophyll
  3. Mitochondria
  4. All

Answer: 4. All

Question 36. Which of the following protozoan causes malaria

  1. Amoeba
  2. Paramecium
  3. Entamoeba histolytica
  4. Plasmodium

Answer: Plasmodium

Question 37. Which of the following conditions are favorable for bacterial growth?

  1. Moist
  2. Warm
  3. Dry
  4. Hot

Answer: 1. Moist

Question 38. Measles is caused by

  1. Bacteria
  2. Fungi
  3. Virus
  4. Protozoa

Answer: 3. Virus

Question 39. Malaria is caused by

  1. Bacteria
  2. Fungi
  3. Virus
  4. Protozoa

Answer: 4. Protozoa

Question 40. Foot and mouth disease in cattle is caused by

  1. Bacteria
  2. Fungi
  3. Virus
  4. Protozoa

Answer: 3. Virus

Question 41. Tobacco mosaic in tobacco is caused by

  1. Bacteria
  2. Fungi
  3. Virus
  4. Protozoa

Answer: 3. Virus

Question 42. Rust in plants is caused by

  1. Bacteria
  2. Fungi
  3. Virus
  4. Protozoa

Answer: 2. Fungi

Life Under A Microscope (Microorganisms) Summative Worksheet Multiple Choice Questions

Question 1. Bacilli bacteria are

  1. Rod-shaped
  2. Spiral in shape
  3. Ball-shaped
  4. Variable in shape

Answer: 1. Rod-shaped

Question 2. Bacteria, on the basis of nutrition, maybe

  1. Autotrophic
  2. Both autotrophic and heterotrophic
  3. Heterotrophic
  4. Symbiotic

Answer: 2. Both autotrophic and heterotrophic

Question 3. Fungi, on the basis of nutrition, are

  1. Saprophytic
  2. Parasitic
  3. Autotrophic
  4. Saprophytic and parasitic

Answer: 4. Saprophytic and parasitic

Question 4. Algae are found

  1. In water
  2. On tree branches
  3. On land
  4. On mountains

Answer: 3. On land

Multiple Choice Questions on Life Under a Microscope for NEET Exam

Question 5. Heterocyst is found in

  1. Algae
  2. Brown algae
  3. Blue-green algae
  4. Diatoms

Answer: 3. Blue-green algae

Question 6. Sleeping sickness is caused by a

  1. Protozoan
  2. Fungus
  3. Alga
  4. Bacterium

Answer: 1. Protozoan

Question 7. Non-cellular microbes are

  1. Bacteria
  2. Fungi
  3. Viruses
  4. Diatoms

Answer: 3. Viruses

Question 8. Yeast helps in the production of

  1. Sugar
  2. Alcohol
  3. Oxygen
  4. Agar

Answer: 2. Alcohol

Question 9. Pasteurisation of milk destroys its

  1. Vitamins
  2. Fat content
  3. Bacteria
  4. None of the above

Answer: 3. Bacteria

Question 10. The bread or dosa dough rises because of the action of

  1. Heat
  2. Growth of yeast cells
  3. Kneading or grinding
  4. All the above

Answer: 2. Growth of yeast cells

Question 11. Salting the food helps to preserve it by

  1. Extracting water from the cells
  2. Lowering its temperature
  3. Increasing its acidity
  4. None of the above

Answer: 1. Extracting water from the cells

Question 12. Algae are an important part of the aquatic food chain because they are

  1. Decomposers
  2. Producers
  3. Consumers
  4. None -of the above

Answer: 2. Producers

Life Under A Microscope (Microorganisms) Fill In The Blanks

Question 1. Micro-organisms can be seen with the help of a _______________.
Answer: Microscope

Question 2. The largest fungi are the _______________.
Answer: Mushrooms

Question 3. Algae can prepare their own food because they possess _______________.
Answer: Cholorphll

Question 4. Iodine is obtained from _______________.
Answer: Kelp

Question 5. Agar is obtained from _______________.
Answer: Red Alga

Question 6. The plant body in multicellular fungi is made up of _____________________
Answer: Hyphae

Question 7. Viruses are _______________ in size than bacteria.
Answer: Smaller

Question 8. The fungus that grows on bread is known as _______________
Answer: Yeast

Question 9. Bacteria generally reproduce by _______________
Answer: Binary Fission

Question 10. The virus which attacks bacteria is called _______________
Answer: Bacteriophage

Question 11. Cell walls of diatoms are a rich source of _______________
Answer: Silica

Question 12. The disease-causing micro-organisms are called _______________
Answer: Pathogens

Name the following:

Question 1. A bacterium that helps in the curdling of milk.
Answer: Lactobacillus

Question 2. A fungus used in the preparation of antibiotics.
Answer: Penicillium

Question 3. A fungus used in the bread industry.
Answer: Yeast

Question 4. The specialized cell is found in blue-green algae.
Answer: heterocyst

Question 5. A micro-organism used in the production of alcohol.
Answer: Yeast

Question 6. Two diseases are caused by bacteria, fungi, protozoa, and viruses.
Answer: Cholera, typhoid, tuberculosis, diphtheria, plague Ringworm (skin disease) and Rusts in plants Malaria, dysentery, sleeping sickness Common cold, chickenpox, smallpox, measles, polio, rabies

Question 7. The scientist who discovered pencillin’.
Answer: Alexander Flemming

Question 8. Two food items were prepared using yeast. 1 -0. A nitrogen-fixing bacterium.
Answer: Idli, Dosa, Bread

Question 11. Malaria causes micro-organisms.
Answer: Plasmodium

Question 12. Five protozoans.
Answer: Amoeba

Question 13. Two bacteria causing food poisoning.
Answer: Salmonella And Clostridium

Question 14. Two fungi cause food poisoning.
Answer: Aspergillus And Penicillium

Find the odd one out. Give reasons in support of your answer.

Question 1. Algae, fungi, protozoa, flowering plants
Answer: Flowering plants

Question 2. Chlorella, Chlamydomonas, yeast, bread mold
Answer: bread mold

Question 3. Chlorella, Spirogyra, diatoms, mushroom
Answer: Mushroom

Life Under A Microscope (Microorganisms) Match The Following Columns

NEET Biology Life Under A Microscope Microorganisms Match The Following Columns

Answer: 1 – r, 2 – t, 3– p, 4 – q, 5– s

Life Under A Microscope (Microorganisms) Write True Or False

Question 1. Malaria is caused by a virus.
Answer: False, It is caused by a protozoan i.e., Plasmodium

Question 2. The germ theory of disease was given by Leeuwenhoek.
Answer: False, It was Louis Pasteur who first stated the “germ theory of disease”

Question 3. The study of fungi is called mycology.
Answer: True

Question 4. Plague is caused by the bite of infected fleas.
Answer: False, Plague is a deadly infectious disease that is caused by the enterobacteria Yersinia pestis

Question 5. Agar is obtained from blue-green algae.
Answer: False, It is obtained from a red alga.

Question 6. The study of algae is called psychology.
Answer: False, Phycology is the study of algae.

Question 7. Molds are a type of fungi.
Answer: True

Question 8. Milk is preserved by pasteurization.
Answer: True

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