Topic 1: Habitat, Species, Population, Community and Ecosystem 2.3 Interdependance and Interaction among Organisms, and between Organisms and the Environment
5 Important Terms!
Habitat The natural surroundings or home of an organism.
Species A group of organisms that have a similar characteristics and can reproduce to breed offsprings. Dragonfly species
Population Organisms of the same species that live together in the same habitat. A population of dragonflies
Community Several different populations of organisms that live together in the same habitat and interact with one another. Pond Community
Ecosystem Several communities that live together in one habitat and interact with one another include with non-living components such as water, air and soil. Pond Ecosystem
Ecosystem. WHAT’s the important?? Species Population Community Ecosystem To maintain balance in environment
A Balanced Ecosystem • Organisms in an ecosystem are interdependent on: • each other • non-living components - such as water, light, air and soil. Balanced Ecosystem
A Balanced Ecosystem
Observation water at room temperature for their survival
Observation to prevent light from entering the petri dish will die
Observation to absorb water vapour damp / moist area medium dark damp / moist
Adaptation of Living Things to the Environment • rainfall • sunlight Tropical Desert • extreme hot and dry weather. Tundra • long winters • short summers
Factors that Influence Population Size in an Ecosystem
Factors that Influence Population Size in an Ecosystem Disease • Avian flu in poultry – rearing areas • Tobacco mosaic virus in tobacco crops
Factors that Influence Population Size in an Ecosystem Presence of predators • Size of zebra population in savanna ecosystem decreases – presence of lion
Factors that Influence Population Size in an Ecosystem Source of food • Panda depends on bamboo as its primary food source • Malaysia – crow population increased – abundance of food scraps
Factors that Influence Population Size in an Ecosystem Change of weather • Droughts • Soil become dry and infertile • Increase risk of forest fire • Population of plants and animals decreases
Changes in the Ecosystem
Changes in the Ecosystem Migration • Animal – move from one place to another due to a change of season. • Example: cattle egret migrates to Kuala gula, Perak (September to April) • Number of insects such as grasshoppers, crickets, spiders, flies and worms decreases
Changes in the Ecosystem Limited water supply • Paddy – requires a lot of water • Long drought season – upset the balance between populations in the paddy field. • Food web affected – population of producer (paddy) decreases
Changes in the Ecosystem Change in Population size • The size of a population – decrease or increase because of changes in another population. • Example: increase of pests such as beetles and caterpillars causes the population of plants to decrease.
See you in the next video …