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:

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#Environmental Science

Q. The ozone hole is most prominently observed over:

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Q. Which of the following chemicals has the highest ozone depletion potential (ODP)?

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#Question id: 39358

#Environmental Science

Q. The international agreement aimed at controlling ozone-depleting substances is:

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#Question id: 39359

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Q. Which element released from CFCs directly destroys ozone molecules?

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#Question id: 39360

#Environmental Science

Q. Ozone depletion results in increased:

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#Question id: 39361

#Environmental Science

Q. Increased UV-B radiation can cause all EXCEPT:

Skin cancer

 Cataracts

 Enhanced photosynthesis

DNA damage