How does immunodeficiency occur? What are its types?

How does insulin deficiency occur ?

What is vaccine ? What are its types ?

What is variation? What are its types?

What is mechanical energy ? What are its two types ?

How does budding occurs is hydra?

What is cross - pollination ? What are its types ?

Name the cellular factory responsible for protein synthesis. How does it exists in inactive state? What are the types?

How does magnesium occur in nature? How is the metal extracted from its Ore?

What is the importance of physical quantity? What are its types?