Explanation:

This is so because the Southern Hemisphere has significantly more ocean and much less land; water heats up and cools down more slowly than land. The movement of sea and land breeze helps to moderate the climate. On the other hand, where in Northern hemisphere there is more land, temperatures reach both extremes, for e.g. in Central Asia or Siberia.
Statement 2: Photoperiodism is related to plants reaction to light, it isn’t relevant here.