NEET BIOLOGY

Detailed explanation-1: -Predators can limit the size of populations by weakening their hosts, resulting in disease or death. Resource shortages triggered by increasing population size are density-independent limiting factors. Some human activities, such as damming rivers, are density-independent limiting factors.

Detailed explanation-2: -As predator populations increase, they put greater strain on the prey populations and act as a top-down control, pushing them toward a state of decline. Thus both availability of resources and predation pressure affect the size of prey populations.

Detailed explanation-3: -A second density-dependent limiting factor is predation. Predators kill and eat their prey, of course, so predation increases prey death rate and can cause negative growth rates – population decline.

Detailed explanation-4: -2002). Limitations to population growth are either density-dependant or density-independent. Density-dependent factors include disease, competition, and predation.

Detailed explanation-5: -Different limiting factors affect the ecosystem. They are (1) keystone species, (2) predators, (3) energy, (4) available space, and (5) food supply.