Ecology - Introduction

Question 1

Key terms

Answer 1

Ecosystem - Interactions between living organism + non living abiotic (light, water)

Community - all members of all species

Habitats - Environment where organism thrive

Population - total number of organism in the same species

Environment - The abiotic factors of a place

Niche - specific role an being or factor have (decomposers return nutrient to environment)

Question 2

Measuring population growth with S shape graph

Answer 2

Similar to life cycle of colonies

-Lag, Log, stationary, death phases

Question 3

S - shape graph

Answer 3

https://resource.download.wjec.co.uk/vtc/2020-21/el20-21_1-17/bacterial-growth-eng.jpg

Question 4

J shape graph explanation

Answer 4

Contain lag+log phase + stationary fluctuations

Carrying capacity - when habitat reach max carrying capacity for organism, does environment resistance

Environment resistance - not enough food, space available so organism dies, when population lower than carrying capacity this stop

Population can rise above carrying capacity due to still excess resources for a short time

Question 5

J shape graph

Answer 5

https://resource.download.wjec.co.uk/vtc/2020-21/el20-21_1-17/exponental-carrying-capacity-eng.jpg

Question 6

Density dependent + density independent resistance

Answer 6

2 types of environment resistance

Dependent - impact caused by population size (low food, migration, disease)
Independent- impact happens regardless of population (weather, pollution)

Question 7

Competitions

Answer 7

Interspecific - between different species

Infraspecific - between same species (density dependant)