Write notes on:

Harmful bacteria:

1) Microscopic organisms having free chromosome, cell organelles, cell membrane, cell wall.

2) Harmful bacteria cause diseases in humans and animals.

3) Few well known harmful bacteria are:

Staphylococcus bacteria produce a poisonous substance enterotoxin

As it grows on food stuffs eating such food causes diarrhea and vomiting.

Clostridium bacteria grow in canned food stuffed after date of expiry.