What should you use to collect pond or stagnant water for observation under a microscope?
  • Beaker
  • Dropper
  • Container
  • Spoon
Why should you not touch the soil with your bare hands when collecting soil for observation?
  • It is dirty
  • It may contain microorganisms
  • It is wet
  • It is cold
What is the recorded data for Amoeba (Protozoa)? Fill in the blank: Amoeba is a ________, moving, irregular shape.
  • Single cell
  • Multi-cell
  • Plant cell
  • Animal tissue
Which microorganism is described as: 'Single cell, moves from one place to another, movement takes place with the help of specialised structures'?
  • A) Amoeba
  • B) Paramecium
  • C) Algae
Fill in the blank: Algae is a single cell, looks green because of the presence of ________, movement takes place with the help of specialised structures.
  • green pigment
  • chlorophyll
  • red pigment
  • hemoglobin
Which organism in soil suspension has a branched filament without chlorophyll and a sac-like structure?
  • Bread mould (Fungi)
  • Mould (Fungi)
  • Algae
  • Bacteria
Which organism in soil suspension has a branched filament without chlorophyll and a brush-like structure?
  • Algae
  • Bread mould (Fungi)
  • Mould (Fungi)
  • Bacteria
Which organism in soil suspension is spherical and contains chlorophyll—a green pigment?
  • Bread mould (Fungi)
  • Mould (Fungi)
  • Algae
  • Bacteria
Bacteria in soil suspension can be spherical, comma, spiral or rod-shaped, and have one long hair-like structure and many small hair-like projections around the cell.
  • True
  • False
Viruses are microscopic and acellular. They multiply when they enter a living cell.
  • True
  • False
What causes this growth on the fruit?
  • Microorganisms (microbes) cause the powdery or cotton-like growth on the fruit.
  • Sunlight causes the powdery or cotton-like growth on the fruit.
  • Wind causes the powdery or cotton-like growth on the fruit.
  • Water droplets cause the powdery or cotton-like growth on the fruit.
But why do microorganisms not infect the pickles and murabbas?
  • Because you add many spices with salt or sugar to them, which act as preservatives. High concentration of salt or sugar does not allow these organisms to grow on them.
  • Because pickles and murabbas are always kept in the refrigerator.
  • Because microorganisms cannot survive in glass jars.
  • Because pickles and murabbas are made only in winter.
The diversity of microorganisms plays a role in our daily life and helps clean the environment by:A. Breaking down waste and pollutantsB. Producing harmful toxinsC. Causing diseases onlyD. Preventing plant growth
  • Breaking down waste and pollutants
  • Producing harmful toxins
  • Causing diseases only
  • Preventing plant growth
The purpose of this activity is:
  • To understand the objective of the activity
  • To learn about historical events
  • To practice mathematical calculations
  • To explore scientific concepts
After 2–3 weeks, observe the changes that have taken place. Do you observe any difference in the contents of the container? Explain your observation.
  • Yes, the contents of the container have decomposed and changed in appearance.
  • No, the contents of the container remain exactly the same as before.
  • The contents of the container have multiplied in quantity.
  • The contents of the container have turned into a liquid.
Manure is ______ and it helps the soil by ______.
  • a natural fertilizer; improving its fertility
  • a type of pesticide; killing insects
  • a synthetic chemical; polluting the soil
  • a mineral; making soil harder
Peels of fruits and vegetables turn into manure by which process?
  • By decomposition by microorganisms
  • By freezing them
  • By drying them in sunlight
  • By mixing them with chemicals
Gardeners collect dry leaves and plant waste and put them into pits because:
  • they want to make compost for enriching the soil.
  • they want to keep the garden clean only.
  • they want to burn the waste later.
  • they want to attract insects.
The word 'Krimi' in ancient Indian texts refers to:
  • A type of disease-causing organism
  • A sacred ritual
  • An ancient weapon
  • A form of traditional music
Fill in the blank: The process by which microorganisms break down complex substances of fallen leaves into simpler substances that are rich in nutrients is called ________.
  • decomposition
  • photosynthesis
  • evaporation
  • condensation
Microorganisms help recycle waste and return important nutrients to nature.
  • True
  • False
Manure formation occurs at optimal temperature and appropriate moisture level.
  • True
  • False
The diversity of microorganisms helps in our kitchen by:
  • Aiding in food fermentation and preservation
  • Increasing the risk of food spoilage only
  • Making all foods taste bitter
  • Preventing the growth of any bacteria
Ananda Mohan Chakrabarty received a patent in 1980. What is a patent?
  • A patent is a copyright given to a person so that no one else can copy, use or sell his/her invention without permission.
  • A patent is a government license that allows a person to use any invention freely.
  • A patent is a certificate given for artistic work.
  • A patent is a trademark for a company logo.
Which of the following problems can be solved with the help of microorganisms?
  • Waste decomposition
  • Traffic management
  • Internet connectivity
  • Weather forecasting
What is the difference in the volume of dough in bowl A and bowl B after kneading?
  • The difference in the volume of dough in bowl A and bowl B after kneading is 100 ml.
  • The difference in the volume of dough in bowl A and bowl B after kneading is 50 ml.
  • The difference in the volume of dough in bowl A and bowl B after kneading is 200 ml.
  • The difference in the volume of dough in bowl A and bowl B after kneading is 0 ml.
Which gas is present in high proportion in biogas?
  • Oxygen
  • Methane
  • Nitrogen
  • Hydrogen
The dough in bowl A, where yeast was added, has risen slightly, become fluffy, and has a different smell compared to the dough kneaded without yeast. What is the role of yeast, and why did we add sugar and warm water to the flour?
  • Yeast helps the dough rise by producing carbon dioxide, and sugar and warm water activate the yeast.
  • Yeast makes the dough harder, and sugar and warm water are used to sweeten the dough.
  • Yeast changes the color of the dough, and sugar and warm water are used to cool it down.
  • Yeast prevents the dough from rising, and sugar and warm water stop fermentation.
Yeast belongs to a group of microorganisms called fungi. Yeast grows well in warm conditions.
  • True
  • False
Yeast produces carbon dioxide during its growth, which forms bubbles that make the dough soft and fluffy.
  • True
  • False
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