Question

The global mean temperature appears to be rising, at least in the short term, has occurred so may times in the past. An inevitable result of this change is

• A. First frost dates will be delayed
• B. Birds will migrate shorter distances
• C. Oxygen levels in the oceans will rise
• D. Available fertile lands will decrease as desertification increase
• E. Animal life will be reduced worldwide

Answer 1

Answer: (A)

First frost dates will be delayed

The first frost occurs under a clear sky and calm winds. On overcast nights, cloud cover acts like a blanket on the earth, trapping radiant heat from the ground. The wind mixes the air thus trapped in the atmosphere creating a uniform temperature. But a global mean temperature rise will delay the first frost. Thus the correct answer is option A.