Define a nerve and explain the three different kinds.

Define stress and explain the types of stress.

Define and explain the term coordination sphere.

What does an Ecological Pyramid indicate ? Explain the three different types of upright Pyramids in nature with help of an example each.

Define pollination. Explain the different types of pollination. List two agents of pollination. How does suitable pollination lead to fertilization?

Explain the three components of a Periderm.

Define or explain : Charles's Law

Define or explain : Absolute zero

Define lanthanoids. Give three differences between lanthanoids and actinoids.

Explain with the help of suitable examples the three different ways by which organisms overcome their stressful conditions lasting for short duration .

Define organic evolution in three words.