Question

1a) How is eutrophication recognized ?

1b) list two advantages and two disadvantages of using fossils to study evolution ?

1c) what are the premises of optimal foraging behavior ?

1d) energy is lost in the transfer between trophic levels, where does it go?

1e) which one of the following is not a characteristic of platyhelminthes (flatworms)?

a. Two germs layers

b. bilateral symmetry

c. true tissues

d. cephalization

e. no body cavity

Answer 1

Answer 1

(a) The common symptoms or recognition of eutrophycation is the presence of blue-green algal (Cyanobacteria) blooms.

(b) Two advantages-

Fossils shows the  mode of preservation of historical species.

Fossils help in knowing the time frame in which different organisms use to live.

   Two disadvantages-

Fossil records are passive and we can just think that organisms would have evolved in a particular way.

Not all the living things leave behind fossils.

(C) A key premise of the theory is that organisms have, with the help of the process of natural selection, evolved behaviors that leads to maximize their rate of intake of energy at a given period of time.

(d) A very small amount as 10 percent of the energy at a particular trophic level is transferred to the next level and the rest of the energy is lost through metabolic processes as heat.

(e) The correct answer is a. Two germ layer.

flatworms have three germ layer namely ectoderm, endoderm and mesoderm.