question_answer 4)

What will happen if plants and animals disappear from the Earth's surface? Can human beings survive under such a situation? Why is biodiversity necessary and why should it be conserved?  

Answer:

(a) If the plants and animals disappear from the Earth's surface, then the ecological balance will be disturbed. Without plants there will be no oxygen available for breathing after some time and everybody will die. (b) Biodiversity means biological diversity, i.e., there are many animal and plant species on our planet spread all over the world. These animal and plant species, including humans, are all interdependent. (c) Each species has its own place and role to play in the environment and help in the maintaining the ecological balance. That's why it should be conserved.