Eurythermal organisms are those which

Which of the following are examples of short-term adaptation?
$(1)$ Accumulation of melanin in the skin
$(2)$ Utilization of stored fat by animals during hibernation
$(3)$ Seed dormancy
$(4)$ Phototropism of stems and geotropism of roots

In plants,which of the following explains their functions and characteristics?

During adverse seasons,therophytes survive by:

The treeless biome of cold climates is:

How many major biomes are there on Earth in terms of average annual temperature and precipitation?