Practice Questions

TLS Online TPP Program

#Question id: 11380

Which of the following is/are NOT valid explanation(s) for the observed pattern of species richness?

#XL - T Zoology

Older communities are more species rich.
Large areas support more species.
Absence of Natural enemies, area with more species richness
Greater productivity permits existence of more species

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TLS Online TPP Program

#Question id: 34347

#XL - S Microbiology

Which of the following are true about the Z-value?

TLS Online TPP Program

#Question id: 34348

#XL - S Microbiology

Which of the following correctly distinguish Thermal Death Point (TDP) and Thermal Death Time (TDT)?

TLS Online TPP Program

#Question id: 34349

#XL - S Microbiology

Which of the following plots can be used to determine TDT and Z-value?

TLS Online TPP Program

#Question id: 34350

#XL - S Microbiology

Which of the following conclusions can be drawn if TDT decreases as temperature increases?

TLS Online TPP Program

#Question id: 34351

#XL - S Microbiology

A microbial population is reduced from 1 × 10⁶ CFU/mL to 1 × 10³ CFU/mL after 9 minutes at 121°C. Assume first-order kinetics. What is the D-value (in minutes) at 121°C?

TLS Online TPP Program

#Question id: 34352

#XL - S Microbiology

The D-value for a microorganism is 4 minutes at 120°C and 0.4 minutes at 130°C.

What is the Z-value (in °C)?