Changing ecosystems and resources in an ecosystem revision

Yucca flowers are pollinated by yucca moths. The moths lay their eggs in the flowers where the larvae hatch and eat some of the developing seeds. Both species benefit. 

• parasitism
• commensalism
• mutualism

Remoras attach themselves to a shark’s body. They then travel with the shark and feed on the leftover food scraps from the shark’s meals. The relationship neither harms nor benefits the shark. 

• parasitism
• commensalism
• mutualism

Oxpeckers feed on the ticks found on a rhinoceros. The oxpeckers get a meal and the rhinoceros is helped by the removal of the ticks.

• parasitism
• commensalism
• mutualism

What happens when the population of prey decreases?

• The population of predator will increase

• The population of predator will increase and then decrease

• The population of predator will not be affected

• The population of predator will decrease shortly after

How are the populations of predators and prey related?

• If there is not enough prey, the predators will die out

• If there is too much prey, the predators will die out

• If there are not any predators, the prey will die out

• If there are too many predators, the prey will overpopulate

How are ecosystems disrupted?

• Due to the care and excessive maintenances of natural spaces.

• As a result of creating new natural resources.

• Due to the occupation, pollution and destruction of natural spaces.

When does the extinction of a species occur?

• When there are only five individuals left.

• When the youngest individuals die, but the adults remain.

• When the last individual dies.

• FIrst and 3rd option are right.

What is the correct definition of a population.

• Groups of individuals of the same species.

• Made up of the different populations living together.

• All the organisms living in a habitat AND the non-living parts of the habitats e.g. an ocean.

• Trying to get enough resources.

Organisms that make up the living part of an ecosystem.

• abiotic
• biotic factors
• ecology
• ecosystems

Which of the following factors do plants compete for?

• Light, space, water & mates

• Water, mates, space & mineral ions

• Space, water, mineral ions & light