Write what do phytophagous insects feed on ?

Most insects are:

Draw a pyramid of numbers of a situation when a large population of insects feed upon a very big tree. The insects in turn are eaten by small birds which in turn are fed upon by big birds.

Write what do you know about Natural Selection or Survival of the fittest.

Give one example Phytophagous animal

Explain the reason why pitcher plant feeds on other insects although it can perform photosynthesis?

Name the term used for polination by insects. Given an example of insect pollinated plant. Write any four characters of insect pollinated plant.