Microbial Growth and Reproduction
Biology ⇒ Microorganisms and Microbiology
Microbial Growth and Reproduction starts at 9 and continues till grade 12.
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See sample questions for grade 10
A scientist observes that a bacterial culture stops growing after several hours, even though some nutrients remain. Suggest one possible reason for this observation.
Describe one way in which bacteria can exchange genetic material without reproducing.
Describe the four main phases of the bacterial growth curve.
Explain the difference between lag phase and log phase in microbial growth.
Explain why bacteria do not continue to grow exponentially forever in a closed system.
Explain why temperature affects the rate of microbial growth.
A culture of bacteria is in the log phase. If the number of cells is 500 and the generation time is 20 minutes, how many cells will there be after 1 hour?
A scientist observes that a bacterial culture stops growing after several hours, even though some nutrients remain. Suggest one possible reason for this observation.
Which of the following best describes facultative anaerobes?
(1) Require oxygen to survive
(2) Cannot survive in the presence of oxygen
(3) Can grow with or without oxygen
(4) Require high salt concentrations
Which of the following best describes the death phase in a bacterial growth curve?
(1) Cells are adapting to the environment
(2) Cells are dividing rapidly
(3) The number of dying cells exceeds the number of new cells formed
(4) The population remains constant
Which of the following environmental factors does NOT affect microbial growth?
(1) Temperature
(2) Light intensity
(3) pH
(4) Gravity
Which of the following is a method of sexual reproduction in fungi?
(1) Budding
(2) Fragmentation
(3) Spore formation by fusion of gametes
(4) Binary fission
Fill in the blank: Microorganisms that can survive in very salty environments are called ________.
Fill in the blank: Microorganisms that grow best in acidic environments are called ________.
Fill in the blank: The process by which genetic material is exchanged between bacterial cells through direct contact is called ________.
Microorganisms that grow best at high temperatures are called ________.
True or False: All bacteria form spores when conditions become unfavorable.
True or False: All microorganisms reproduce at the same rate under identical conditions.
True or False: All microorganisms require the same nutrients for growth.
True or False: Fungi can reproduce both sexually and asexually.
