Question

information about effect of extreme cold and extreme hot on the plants

Answer 1

Increased temperature will increase the rate of chemical reactions within the plant. This will mean the plant will need more oxygen, carbon dioxide and water supplied. If it is hot and subsequently dry the plant will reduce water loss by closing stomata slowing normal processes. This works to a limited extent whereby signs of water loss such as wilting occur.
Cold itself mostly just slows processes. Unless the plant is in its reproductive phase. Cold due to ice can depend on how the plant is adapted and how the ice settles. (A covering of ice over a bud can actually protect it from cold temperatures.) If it is sufficiently cold the water within the plant can freeze, causing the cells to expand and break. This could cause death. Source(s): You can research the rest, it can be interesting if you find the right texts. There is a lot of information on temperature, and it is an area of interest presently with concerns about climate change.