Practice LT3 - Science Understandng

What is the main purpose of classification in biology?

• To make it harder to identify organisms

• To organise and understand the diversity of life

• To increase the number of species

• To eliminate extinct species

A dichotomous key helps scientists:

• Identify unknown organisms

• Increase biodiversity

• Change an organism’s characteristics

• Clone new species

Which level of classification is the most specific?

• Kingdom

• Phylum

• Genus

• Species

Which of the following is an abiotic factor in an ecosystem?

A food web represents:

• A single feeding relationship

• A simple chain of organisms

• The movement of energy through an ecosystem

• The classification of species

The removal of a top predator from an ecosystem would most likely:

• Have no effect on the ecosystem

• Increase the population of its prey

• Decrease plant populations

• Both b and c

Which factor is an example of a biotic change affecting an ecosystem?

• A drought reduces water availability

• A volcanic eruption changes soil composition

• A new predator is introduced

• An increase in temperature

Energy flow in an ecosystem follows the path of:

• Decomposers → Consumers → Producers

• Consumers → Producers → Decomposers

• Producers → Consumers → Decomposers

• Producers → Decomposers → Consumers

Which of the following represents the correct order in a food chain?

• Grass → Rabbit → Fox

• Rabbit → Fox → Grass

• Fox → Grass → Rabbit

• Fox → Rabbit → Grass

Habitat destruction can lead to:

• Increased biodiversity

• Species extinction

• Population stability

• More food sources