MCQ
In an ecosystem, which shows one way passage?
  • Free energy
  • B
    Carbon
  • C
    Nitrogen
  • D
    Potassium

Answer

Correct option: A.
Free energy
Free energy

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Crown gall is a neoplastic disease of most dicotyledonous plants and is caused by the soil bacterium Agrobacterium tumefaciens. A large extra chromosomal plasmid in these bacteria was found to be responsible for this disease. The plasmid is known as $Ti$ plasmid. Bacteria free crown gall cells can be cultured in the absence of phytohormones. $Ti$ plasmid is widely used in genetic engineering to deliver the desirable genes. The part of Ti plasmid transferred into plant cell $\text{DNA}$ is called $T-\text{DNA}. T-\text{DNA}$ with desired $\text{DNA}$ segment is inserted into the chromosome of the host plant where it produces copies of itself.
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