An orchid plant is growing on the branch of mango tree. How do you describe this interaction between the orchid and the mango tree?

Most of the living organisms try to maintain the constancy of their internal environment in terms of optimal temperature and osmotic concentration. What is the terminology used for this type of constancy. How the following organisms do maintains it and also specifies the terms for that -:
a) Mammals
b) All plants
c) Birds in Siberia
d) Bacteria, Fungi & Lower Plants

Generally thermo regulation is energetically expensive for many organisms. So, many smaller animals are rarely found in extreme hot or cold climatic condition. Why? Write two specific reasons.

A person working in office try to perform his/ her level best at normal room temperature and also wishes to maintain it by using AC, or fans or heaters. But a labourer works well even under adverse climatic condition. How could his body do it?

Green plants prepare their food either by C3 or C4  pathway  but most of the desert plants have a special photosynthetic pathway called  CAM. What is the reason for such type of adaptation?

Many mammals from colder climates  generally  have  shorter  ear  and  limbs  in comparison to the mammals of other biome . Why? Which general principle is followed?

At high altitudes places like Manali or Mansarover we suffer from altitudes sickness this is because in low atmospheric pressure, body does not get enough oxygen, but gradually the problem is over. How did our body solve this problem?

Observe this diagram and answer the following question.

a) What is the terminology for B& E?
b) If B + I is more then D + E then what will happen to population density?
c) What are the most important factors which influence a population density of an area under normal condition?
d) If a habitat is being colonised recently then which factor contribute more to the population growth ?

Mutualism often involves co-evolution of the mutualist . Explain this statement taking example of plant animal relationship?

Name the type of population interaction in each of the following 1,2,3,4.