Autophagy (“eating oneself”)

When cells are placed under stressful conditions, they have the capacity to recycle macromolecules for use as nutrients in a process of lysosomal degradation.

TLS Online TPP Program

#Id: 5510

#XL - T Zoology

TLS Online TPP Program

#Id: 5511

#XL - T Zoology

Populations of some species are prone to extinction for two reasons

1. The landscapes they live in are patchy (making dispersal between populations difficult).

2. Environmental conditions often change in a rapid and unpredictable manner.

TLS Online TPP Program

#Id: 5513

#XL - T Zoology

The size of a population is determined by a balance between births, immigration, deaths and emigration.

TLS Online TPP Program

#Id: 5515

#XL - T Zoology

Natality means production of new individuals (offspring). 

Maximum or Absolute natality - maximum offspring produced under most suitable environmental conditions. 

Ecological natality - refers to number of offspring produced under prevailing environmental conditions.

TLS Online TPP Program

#Id: 5516

#XL - T Zoology

Mortality refers to death of individuals in a population. 

Minimum mortality rate, minimum death rate which occurs under ideal conditions of environment

Actual death rate is referred to as Ecological mortality.

TLS Online TPP Program

#Id: 5517

#XL - T Zoology

Biotic potential / Intrinsic rate of natural increase (r) It is the inherent power of a population to grow and reproduce when environmental conditions are favorable, and resources are unlimited.