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TLS Online TPP Program

#Question id: 38784

Q. Statement I: Meristem culture was first applied to produce virus-free Dahlia plants.
 Statement II: This application was reported by Morel and Martin in 1952.

#Plant Biotechnology
  1. Both statements are true and Statement II correctly explains Statement I
  2. Both statements are true but Statement II does not explain Statement I
  3. Statement I is true and Statement II is false
  4. Statement I is false and Statement II is true
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TLS Online TPP Program

#Question id: 37965

#Plant Biotechnology

Assertion (A): During the induction phase of pollen culture, total protein synthesis is completely halted. 
Reason (R): Existing proteins are suppressed, and new proteins like napin (in Brassica napus) are synthesized.

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TLS Online TPP Program

#Question id: 37966

#Plant Biotechnology

Assertion (A): Commitment to androgenesis is achieved primarily by the abolition of pollen maturation gene expression. 
Reason (R): During induction, several hundred genes are upregulated or downregulated to facilitate the developmental switch

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TLS Online TPP Program

#Question id: 37967

#Plant Biotechnology

Assertion (A): Responsive pollen in culture always develops directly into a globular embryo. 
Reason (R): The developmental fate (embryo vs. callus) depends on the plant species.

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TLS Online TPP Program

#Question id: 37968

#Plant Biotechnology

Assertion (A): In cereals like rice and wheat, the choice between embryo or callus formation can be manipulated. 
Reason (R): Modifying the medium composition in these species can induce either embryos or calli.

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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.