Define pathogens. Mention their types.

Define hydroponics. Mention the important aspects of hydroponics

Define heat and work and mention their sign conventions.

Name the infectious disease which causes wasting of body parts. Give the scientific name of the pathogen and mention the body organs it primarily affects.

Define stress and explain the types of stress.

Describe the structure of a nerve with a diagram. Mention the three types of nerves.

Name the pioneer species on a bare rock. How do they help in establishing the next type of vegetation? Mention the type of climax community that will ultimately . get established

Define germination ? Name the two types of germination. Explain with examples.

Define gametogenesis. How many types of gametes are found in nature?

What are pathogens?

For survival of pathogen within the environment of the host, pathogen have to :-