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TLS Online TPP Program

#Question id: 10233

Which of the following statements is the most appropriate define character displacement?

#Zoology

  1. Two related species depending on the same prey species avoid competition by feeding at different times of the day.

  2. The body sizes of two related species are very similar when they are allopatric but in geographical areas of sympatric, one species is significantly smaller than the other
  3. The food niche of a species is generally wider in the absence of competing species than in their presence.
  4. Closely related species can coexist if their densities are regulated by a predator
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TLS Online TPP Program

#Question id: 38808

#Plant Biotechnology

Q. Assertion (A):Thermotherapy combined with meristem (shoot-tip) culture is more effective than either method alone for eliminating certain plant viruses.

Reason (R): Some viruses such as Potato virus S (PVS) and Potato virus X (PVX) can only be eliminated when heat treatment is followed by shoot-tip culture, and larger shoot tips taken from heat-treated plants show better survival.

Choose the correct option:
TLS Online TPP Program

#Question id: 38809

#Plant Biotechnology

Q. Assertion (A): Prolonged cold treatment followed by shoot-tip culture can successfully eliminate plant viruses.

Reason (R):Exposure of chrysanthemum plants to 5°C for several months increased the proportion of virus-free plants for both chrysanthemum stunt virus and chrysanthemum chlorotic mottle virus.
TLS Online TPP Program

#Question id: 38810

#Plant Biotechnology

Q. Assertion (A):Increasing the duration of cryotherapy improves virus elimination efficiency.

Reason (R):Extending cold treatment at 5°C from 4 months to 9.5 months increased virus-free frequencies for both CSV and CCMV.
TLS Online TPP Program

#Question id: 38811

#Plant Biotechnology

Q. Assertion (A):Cryotherapy is generally more damaging to plants than thermotherapy.

Reason (R):Cold treatment causes greater physiological stress compared to heat treatment.
TLS Online TPP Program

#Question id: 38812

#Plant Biotechnology

Q. Which of the following statements regarding chemotherapy for virus elimination in plant tissue culture is CORRECT?
TLS Online TPP Program

#Question id: 38813

#Plant Biotechnology

Q. Thermotherapy is noted to be effective against which specific types of pathogens?