AGR112 Agricultural Microbiology Unit I: Major Protist Groups
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Questions and Answers

What are the major groups of protists described in the text?

Bacteria and Algae

How do bacteria usually multiply?

By binary fission

What is the practical significance of bacteria mentioned in the text?

Cause diseases, natural cycling, spoil food, make food.

What is the common feature of all algal cells?

<p>Contain chlorophyll and capable of photosynthesis</p> Signup and view all the answers

Where are algae found?

<p>In aquatic environments or in damp soil</p> Signup and view all the answers

What is the practical significance of Cyanobacteria (Blue Green Algae) as mentioned in the text?

<p>Diazotrophs, build up soil organic matter, enhance water holding capacity of soil, act as soil conditioner, energize phosphate solubilizers, produce phyto hormones.</p> Signup and view all the answers

What is the main characteristic of fungi mentioned in the text?

<p>Eucaryotic lower plants devoid of chlorophyll</p> Signup and view all the answers

How are fungi usually structured?

<p>Usually multicellular but not differentiated into roots, stems, and leaves</p> Signup and view all the answers

How is growth controlled in a turbidostat?

<p>By adjusting the dilution rate to keep constant turbidity</p> Signup and view all the answers

What is the purpose of a photostat in controlling growth rates?

<p>To get steady state cultures of photosynthetic organisms</p> Signup and view all the answers

Why can exponential growth not occur indefinitely in a closed system?

<p>Due to the exhaustion of nutrients or accumulation of toxic products</p> Signup and view all the answers

What happens in the stationary phase of bacterial growth?

<p>Slow loss of cells through death balanced by formation of new cells through growth and division</p> Signup and view all the answers

If a single bacterium with a 20-minute generation time grows exponentially for 48 hours, how much weight can its population reach?

<p>About 4000 times the weight of the earth</p> Signup and view all the answers

Why doesn't exponential growth occur indefinitely in nature?

<p>Growth is limited or ceased due to nutrient exhaustion or accumulation of toxic products</p> Signup and view all the answers

How is the growth rate controlled in a turbidostat?

<p>By adjusting the dilution rate based on the turbidity of the culture vessel</p> Signup and view all the answers

What is the role of the photostat in culturing photosynthetic organisms?

<p>To obtain steady state cultures</p> Signup and view all the answers

What happens to the total cell count in the stationary phase?

<p>It slowly increases</p> Signup and view all the answers

Why does exponential growth cease in closed systems?

<p>Due to nutrient depletion or toxic product accumulation</p> Signup and view all the answers

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