20 MCQs (Without Answers)
Based on the given chapter – Microorganisms & Microalgae
Which bacterium is mainly responsible for converting milk into curd?
a) Rhizobium
b) Lactobacillus
c) Yeast
d) Chlorella
Lactobacillus feeds on which sugar present in milk?
a) Glucose
b) Fructose
c) Lactose
d) Sucrose
During curd formation, bacteria produce:
a) Alcohol
b) Oxygen
c) Lactic acid
d) Water
Curd formation occurs faster in:
a) Cold conditions
b) Warm conditions
c) Dry conditions
d) Windy conditions
Which of the following is NOT a category of microorganisms?
a) Protozoa
b) Fungi
c) Bacteria
d) Mammals
Rhizobium bacteria are commonly found in:
a) Leaves
b) Flowers
c) Root nodules
d) Fruits
Root nodules are mainly found in the roots of:
a) Mango plants
b) Legume plants
c) Coconut plants
d) Rose plants
Which of the following is a legume?
a) Wheat
b) Rice
c) Lentil
d) Maize
Rhizobium bacteria help plants by trapping:
a) Oxygen from air
b) Carbon dioxide from air
c) Nitrogen from air
d) Water from soil
Growing legumes with other crops helps to:
a) Decrease soil fertility
b) Increase nitrogen in soil
c) Dry the soil
d) Reduce oxygen
Microalgae are __________ organisms.
a) Large aquatic animals
b) Microscopic plant-like organisms
c) Flowering plants
d) Reptiles
Microalgae can live in:
a) Water only
b) Soil only
c) Air only
d) Water, soil, air, and on trees
Microalgae prepare their own food using:
a) Moonlight
b) Minerals only
c) Sunlight
d) Heat
More than half of Earth’s oxygen supply is produced by:
a) Animals
b) Microalgae
c) Rocks
d) Insects
Which of the following is an example of microalgae?
a) Rhizobium
b) Lactobacillus
c) Spirulina
d) Yeast
Spirulina, Chlorella, and Diatoms are used by humans as:
a) Fuels only
b) Building materials
c) Health supplements and medicines
d) Pesticides
Microalgae help in:
a) Polluting water
b) Cleaning water
c) Reducing oxygen
d) Drying soil
Microalgae are also used to make:
a) Cement
b) Plastic
c) Biofuel
d) Glass
Which factor is threatening microalgal diversity?
a) Pollution
b) Climate change
c) Habitat destruction
d) All of these
Conserving microalgae is important to maintain:
a) Noise balance
b) Oxygen balance on Earth
c) Temperature of stars
d) Soil colour
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