Ecosystem 2.1 & 2.3

A habitat is the natural surroundings or home of an organism.

• True

• False

Answer explanation

True is correct because a habitat refers to the natural environment where an organism lives, providing the necessary conditions for its survival.

A group of organisms that have common characteristics and can reproduce to breed offsprings is called.......

• ecosystem

• community

• species

• population

Answer explanation

A group of organisms that share common characteristics and can reproduce to produce offspring is defined as a species. This distinguishes them from other groups like populations and communities.

A group of organisms of the same species that live in the same habitat is called .....

• species

• population

• community

• ecosystem

Answer explanation

A group of organisms of the same species living in the same habitat is called a population. This term specifically refers to individuals of the same species, distinguishing it from community (multiple species) and ecosystem (includes abiotic factors).

A community is a few species of different organisms that live together in one habitat and have mutual interaction with one another.

• True

• False

Answer explanation

The statement is false because a community consists of multiple species interacting in a habitat, not just a few. Therefore, the definition provided is incomplete.

An ecosystem is a few communities that live together in one habitat and have mutual interaction with one another including all the non living components such as water, air and soil.

• True

• False

Answer explanation

The statement accurately describes an ecosystem as a community of living organisms interacting with each other and their non-living environment, such as water, air, and soil. Therefore, the correct answer is True.

Which of the following factors can influence the population size in an ecosystem? (choose more than one answer)

• Disease

• Source of food

• Biological Control

• Community of the ecosystem

Answer explanation

Disease can reduce population size by increasing mortality, while the source of food directly affects survival and reproduction rates. Both factors are crucial in determining the population dynamics within an ecosystem.

The migration of cattle egret to Kuala Gula, Perak will cause the following change in the ecosystem:

• The people of Perak becomes very happy.

• The population of other birds in Perak decreases in size.

• The number of insects decreases.

• The number of ducks increases.

Answer explanation

The migration of cattle egret leads to increased predation on insects, resulting in a decrease in their population. This is the most direct ecological impact, unlike the other options which are less likely to occur.

Select all the non-living components in a balanced ecosystem. (There's more than one correct answer.)

• water

• light

• soil

• predator

Answer explanation

In a balanced ecosystem, non-living components include water, light, and soil. These are essential for supporting life, while a predator is a living component, thus not included in the correct answers.

A tick and a dog have this type of relationship.

• mutualism

• commensalism

• neutralism

• parasitism

Answer explanation

The relationship between a tick and a dog is an example of parasitism, where the tick benefits by feeding on the dog's blood, while the dog is harmed in the process.

What type of symbiosis?  Hummingbirds feed on nectar from flowers.  The flowers are pollinated by hummingbirds as they move from flower to flower.

• commensalism

• mutualism

• parasitism

• predation

Answer explanation

The relationship between hummingbirds and flowers is mutualism because both benefit: hummingbirds get nectar for food, while flowers are pollinated, aiding their reproduction.