Which of the following events occur(s) following the binding of a ligand to a G protein–coupled receptor that triggers release of Ca2+?

a. activation of protein kinase A by IP3

b. phospholipase cleavage of PIP2 to IP3 and DAG

c. release of DAG into the cytosol

d. IP3-mediated opening of Ca2+ channels in the ER membrane

#Question id: 10686

#Unit 10. Ecological Principles

 Following figure are shown figure of predator prey model 

Following some observation are given

A) The number of prey, N, increase at low predator densities, P, and decrease at high predator densities

B) Prey zero isoclines is depends on the ratio of the growth rate of prey to the capture efficiency of the predators

C) Number of predator needed for prey isoclines is depends on the ratio of the death rate of predators to the conversion efficiency of predators

D) Number of predator for prey isoclines depends on the ratio of the death rate of prey to the conversion efficiency of predators

Which of the above observation are true?

#Question id: 10687

#Unit 10. Ecological Principles

V(t) and E(t) are, respectively, prey density and predator density at time t. The densities have dynamics

What will the positive equilibrium densities of both predator and pray at isocline

#Question id: 10688

#Unit 10. Ecological Principles

For two species A and B in competition, the carrying capacities, competition coefficients, per capita growth rate and population size are

KA = 1000           KB = 1200    α of B= 1     β of A= .5       rB= .5         r A= .3                

AN= 500                  BN= 200

According to the Lotka-Volterra model, what is growth rate of species A?

#Question id: 10689

#Unit 10. Ecological Principles

Which of the following is correct statement?

A) Body size of parasitoid is always greater than host but parasite usually smaller than host

B) Predator immediately kill their prey however parasitoid never kill their host

C) Intrinsic rate of parasite is faster than host but intrinsic rate of predator is slower than prey

D) Body association time between parasite and host is more than time association between predator and prey

#Question id: 10690

#Unit 10. Ecological Principles

Which of following interaction shown in following species of Paramecium?

#Question id: 10691

#Unit 10. Ecological Principles

Following some attributes of biological control agent of parasite

A) General adaptability to the environment.

B) High searching capacity for hosts.

C) K selected strategy

D) Low dispersal ability.

E) Minimal time lag effects in responding to changes in host numbers.

Following above attribute is not ideal for that biological agent?