what is the difference between a pest, a pathogen and a germ?

Answer 1

Pests are multicellular organisms that cause harm in one way or another.They could be rats or a spotted bollworms of cotton.
Pathogen could be a unicellular or multicelluar organism causing harm by being a parasitic. Many protozoans and bacteria come under this category. Even a common roundworm could be called a pathogen.
Germ is a term applied at various places with slightly different meaning. A microbe could as well be a germ. It may not always cause harm as a lactobacillus bacterium. Germ could be a seed.
Germplasm is the protoplasm of germ cell. Germinal epithelium gives rise to gametes.

Answer 2

Difference Between Pest And Parasite

Answer 3

Pest: pest is an organism which has characteristics that are regarded as injurious or unwanted. This is most often because it causes damage to agriculture through feeding on crops or parasitising livestock, such as codling moth on apples, or boll weevil on cotton. An animal can also be a pest when it causes damage to a wild ecosystem or carries germs within human habitats. Examples of these include those organisms which vector human disease, such as rats and fleas which carry the plague disease, or mosquitoes which vector malaria.
Pathogen: A pathogen is a biological agent that causes disease or illness to its host. The term is most often used for agents that disrupt the normal physiology of a multicellular animal or plant. However, pathogens can infect unicellular organisms from all of the biological kingdoms.
Germ: An organism that is microscopic (too small to be visible to the human eye). Also known as Micro-organism. Microorganisms can be bacteria, fungi, archaea or protists, but not viruses and prions because they are generally classified as non-living. Micro-organisms are often described as single-celled, or unicellular organisms; however, some unicellular protists are visible to the human eye, and some multicellular species are microscopic.

Answer 4

Pest: any irritating creature which causes trouble and occasionally transmits diseases. Eg. Rats, mice, cockroaces.

Pathogen: Disease creating bacteria/virus/fungi - could be visible to naked eye or under microscope.

Germ: Normally visible to naked eye, sometimes under simple microscope. These include worms, germs in teeth etc.

Answer 5

pest is an oragnism which damages things or crops in field
e.g-rats,lice
pathogens are organisms which cause diseases
e.g-bacteria,virus

Answer 6

pest is directly injecting poison giving irritation
pathogen is injecting its DNA or any cellular material thus immune system response producing antibodies-cell damage