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TLS Online TPP Program

#Question id: 40216

Given below are two statements regarding the Miller-Urey experiment:
Statement I: The experiment used a mixture of Methane (CH4), Ammonia (NH3), Hydrogen (H2), and Water vapor (H2O) exposed to electric discharge.
Statement II: The experiment successfully synthesized complex nucleic acids (DNA chains) within the first week.
In light of the above statements, choose the most appropriate answer:

#Environmental Science
  1. Both Statement I and Statement II are correct.
  2. Both Statement I and Statement II are incorrect.
  3. Statement I is correct but Statement II is incorrect.
  4. Statement I is incorrect but Statement II is correct.

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TLS Online TPP Program

#Question id: 37969

#Plant Biotechnology

Statement I: Cold treatment (3–6°C) helps in retarding the aging of the anther wall, thereby allowing more microspores to switch from gametophytic to sporophytic development.
Statement II: Maize responds best to standard cold treatment temperatures of 3–6°C rather than higher temperatures like 14°C
TLS Online TPP Program

#Question id: 37970

#Plant Biotechnology

Statement I: Hot treatment (e.g., 30°C for 24h) in Brassica stimulates embryogenesis by causing the dissolution of microtubules and displacement of the spindle.
Statement II: This thermal shock leads to normal division of the microspore nucleus.
TLS Online TPP Program

#Question id: 37971

#Plant Biotechnology

Statement I: Ethrel (2-chloroethylphosphonic acid) treatment increases haploid production by inducing multinucleated pollen grains.
Statement II: Pollen grains induced by Ethrel treatment are characterized by having a high density of starch grains.
TLS Online TPP Program

#Question id: 37972

#Plant Biotechnology

Statement I: Commitment to androgenesis is achieved mainly by the overexpression of pollen maturation ('late') genes.
Statement II: In wheat, the synthesis of a metallothionein-like protein during induction is regulated by Abscisic Acid (ABA).
TLS Online TPP Program

#Question id: 37973

#Plant Biotechnology

Statement I: In cereal species like rice and wheat, modifying the medium composition can determine whether the cell mass forms an embryo or a callus.
Statement II: The formation of a callus versus a globular embryo is strictly dependent on the temperature and cannot be influenced by the species type.
TLS Online TPP Program

#Question id: 37974

#Plant Biotechnology

Which of the following phenomena is primarily responsible for the wide variation in ploidy levels observed in plants regenerated from anther or microspore culture?