Neurotransmitters can affect postsynaptic cells by ________.

I) initiating signal transduction pathways in the cells

II) causing molecular changes in the cells

III) altering ion channel proteinsIII) altering ion channel proteins

IV) altering the permeability of the cells

#Question id: 10645

#Unit 10. Ecological Principles

The logistic equation above is used to describe the rate of change of a population, N, with time, t, where r is the intrinsic rate of increase and K is the carrying capacity. dn/dt is isoclines when 

#Question id: 10646

#Unit 10. Ecological Principles

Four sampling unit of Area occupy by species having following number is 00, 20, 10, 20. What is abundance of that species?

#Question id: 10647

#Unit 10. Ecological Principles

Use the graph to answer the following question

In the figure, which of the following survivorship curves implies that an animal may lay many eggs, of which a regular number die each year on a logarithmic scale?

#Question id: 10648

#Unit 10. Ecological Principles

Which statements about K are correct?

I) K varies among populations.

II) K varies in space.

III) K varies in time.

IV) K is constant for any given species.

#Question id: 10649

#Unit 10. Ecological Principles

According to the logistic growth equation

A) the number of individuals added per unit time is greatest when N is one fourth of K

B) the per capita growth rate (r) increases as N approaches K

C) population growth is zero when N equals K

D) the population grows exponentially when N approaches K

#Question id: 10650

#Unit 10. Ecological Principles

Following some characteristic feature of K selected species

A. semelparity 

B. Mate choice

C. Density independent mortality

D. large size of offspring

What is the above combination is correct?