Which of the following is a possible advantage for the environment of having farmers use plants that genetically produce bt toxin? a) plants with genes for the toxin are eaten less often by insects, and therefore less insecticide is needed. b) plants that produce bt toxin must be grown from new seeds each season, and therefore fewer of them are planted. c) bt toxin is advantageous to many species of invertebrates that grow in the same fields. d) harvesting plants with these genes is less disturbing to the soil layers where they are planted. e) plants with these genes must be sprayed with the organism, but need much less than other plants.

A) Plants with genes for the toxin are eaten less often by insects, and therefore less insecticide is needed.

Explanation:

Bt endoxin is lethal for some insects that ingest it (it is effective insecticide). Because of that, gene for the toxin is often used in the genetic engineering of certain plants, in order to reduce the use of pesticides. Unlike pesticides, which are unspecific (kill all insects, even those benefitial), Bt plants are a bit more specific.

Another advantage is that it has been shown that Bt corn is safe for human consumption.

the answer is: trichonympha lives in the gut of termites and digests cellulose eaten by the termite.

this is an example of a symbiotic association of a protozoan with its mode of association.

hope i

-lavira: )