Question 1

Which of the following statements about bacteria is true?

Accepted Answer

They can be harmful or beneficial to humans

Answer

Bacteria are not affected by antibiotics

Answer

Bacteria are never found outside the human body

Answer

Bacteria are always harmful to humans

Question 2

What is the shape of cocci bacteria?

Accepted Answer

Spherical

Answer

Square-shaped

Answer

Spiral-shaped

Answer

Rod-shaped

Question 3

How do bacteria reproduce?

Accepted Answer

Through binary fission

Answer

Through sexual reproduction

Answer

Through spore formation

Answer

Through budding

Question 4

Which of the following is a characteristic of beneficial bacteria?

Accepted Answer

They help in the digestion of food

Answer

They cause infections and diseases

Answer

They are always harmful to humans

Answer

They are resistant to antibiotics

Question 5

What is the main function of bacteria in the nitrogen cycle?

Accepted Answer

Converting atmospheric nitrogen into a usable form

Answer

Causing food spoilage

Answer

Causing infections in plants

Answer

Producing oxygen through photosynthesis

Question 6

Which of the following is an example of a harmful bacteria?

Accepted Answer

Salmonella

Answer

Escherichia coli (E. coli)

Answer

Bacillus subtilis

Answer

Lactobacillus

Question 7

What is the role of bacteria in the process of decomposition?

Accepted Answer

Breaking down organic matter into simpler substances

Answer

Storing nutrients in plant roots

Answer

Producing energy through photosynthesis

Answer

Causing food spoilage

Question 8

Which bacterial shape is commonly known as 'spirilla'?

Accepted Answer

Spiral-shaped

Answer

Curved

Answer

Spherical

Answer

Rod-shaped

Question 9

What is the function of the cell wall in bacterial cells?

Accepted Answer

Providing structural support and protection

Answer

Storing genetic information

Answer

Producing energy for the cell

Answer

Regulating the passage of substances into and out of the cell

Question 10

Which type of bacteria has a rod-shaped appearance?

Accepted Answer

Bacilli

Answer

Spirilla

Answer

Cocci

Answer

Streptococci

Question 11

Which of the following is a characteristic of bacteria?

Accepted Answer

They are unicellular organisms

Answer

They are multicellular organisms

Answer

They have chlorophyll

Answer

They have a true nucleus

Question 12

What is the function of flagella in bacteria?

Accepted Answer

To help in movement

Answer

To protect the cell membrane

Answer

To produce food through photosynthesis

Answer

To store genetic material

Question 13

Which of the following is NOT a way in which bacteria can obtain energy?

Accepted Answer

Through the process of mitosis

Answer

Through breaking down dead organisms

Answer

Through photosynthesis

Answer

Through fermentation

Question 14

What is the role of bacteria in the nitrogen cycle?

Accepted Answer

Converting nitrogen gas into a form that plants can use

Answer

Producing oxygen through photosynthesis

Answer

Regulating body temperature in mammals

Answer

Breaking down dead organisms for energy

Question 15

How do bacteria reproduce?

Accepted Answer

Through binary fission

Answer

Through meiosis

Answer

Through fragmentation

Answer

Through spore formation

Question 16

Which of the following is a defining characteristic of bacteria?

Accepted Answer

They lack a membrane-bound nucleus

Answer

They contain chloroplasts for photosynthesis

Answer

They undergo sexual reproduction

Answer

They are always multicellular organisms

Question 17

What is the role of bacteria in the process of fermentation?

Accepted Answer

To convert sugars into alcohol or acids

Answer

To regulate body temperature in mammals

Answer

To break down dead organisms for energy

Answer

To produce oxygen through photosynthesis

Question 18

Which of the following best describes the shape of a bacterium called cocci?

Accepted Answer

Spherical

Answer

Spiral-shaped

Answer

Square-shaped

Answer

Rod-shaped

Question 19

What is the primary role of bacteria in the human digestive system?

Accepted Answer

Aiding in the digestion of food

Answer

Producing antibodies for the immune system

Answer

Storing excess nutrients for later use

Answer

Regulating heart rate

Question 20

Which of the following environments is NOT a common habitat for bacteria?

Accepted Answer

Vacuum of outer space

Answer

Surface of human skin

Answer

Soil

Answer

Intestinal tract of animals

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