Plants growing on sand and gravel are called

Which of the following represents an organism and its ecological niche correctly?

In desert grasslands,which type of animals are relatively more abundant?

In the given graph,what does the horizontal line passing through the middle represent?

Which one of the following is $NOT$ a characteristic of a habitat?

In bacteria,fungi,and lower plants,various kinds of thick-walled spores are formed which help them to survive unfavourable conditions. This phenomenon can be called ...........