Ecosystem dynamic

In the chart, the characteristics of three organisms belonging to the protist and fungi kingdoms are summarized. Considering the information, which of the following statements is CORRECT?

• Organism 1 is a fungus, organism 2 is an alga and individual 3 is a protozoan.

• Organism 1 is a protozoan, individual 2 is a fungus and individual 3 is an alga.

• Organism 1 is a fungus, individual 2 is a protozoan, and individual 3 is an alga.

• Organisms 1 and 2 are fungi and individual three is a protist.

In a lab practice, eleventh-grade students observed organism samples and organized their observations in the data table shown below. According to the chart, which of the following options relates correctly the kingdoms to the organisms to which each sample belongs?

• 1. 1 Fungi

  2. 2 Protist

  3. 3 Animalia

• 1 Protist

  2 Fungi

  3 Plantae

• 1 Plantae

  2 Protist

  3 Animalia

• 1 Fungi

  2 Plantae

  3 Protist

Which of the following statements about the food web shown in the picture is TRUE?

• When the owl feeds on the mouse it acts as a secondary consumer and when it feeds on frogs it acts as a tertiary consumer. 

• When the owl feeds on the mouse it acts as a primary consumer and when it feeds on frogs it acts as a tertiary consumer.

• When the fox feeds on rabbits it acts as a secondary consumer and when it feeds on the mouse it acts as a tertiary consumer.

• When the snake feeds on birds it acts as a secondary consumer and when it feeds on frogs it acts as a tertiary consumer.

Energy flows through the trophic levels of ecosystems. As the level increases, the amount of energy available for the next level decreases. This occurs because:

• photosynthesis produces chemical energy.

• part of the energy is released as heat.

• decomposers need energy

• part of the energy is stored in tissues.

How would the ecological balance of the ecosystem be affected if the leopard seals disappeared?

• The plankton population would decrease.

• The penguin population would decrease.

• The arctic cod and krill population would increase.

• The baleen whale would disappear.

Each cell is equipped with a series of organelles that allow it to produce the substances it needs for its vital processes. Which process is shown and in which organelle is it involved?

• Osmosis, cell membrane.

• photosynthesis, chloroplast.

• cellular respiration, mitochondria.

• phagocytosis, cell membrane.

A student observes on the graph the relationship between room temperature and body temperature in two species. The conclusion made by the student is:

• the mouse regulates its body temperature.

• the lizard keeps its body temperature constant.

• the body temperature of the two species depends on the room temperature.

• high room temperature causes high body temperature in both species.

Based on the diagram, which group of organisms would be considered herbivores?

• Snakes

• Mice

• Grasshoppers

• Grasses

The questions are based on the following table of organisms in an ecological community. The X in a cell indicates that the organism is eaten by the consumer in the first column.

Based on the data in the table, which of the following pairs of organisms has two ecological relationships, both competition and predation?

• Spiders and shrews

• Hawks and snakes

• Spiders and snakes

• Spiders and grasshoppers

The questions are based on the following table of organisms in an ecological community. The X in a cell indicates that the organism is eaten by the consumer in the first column.

Which of the following categories of organisms, which are required for the cycling of matter in an ecosystem, is missing from the table?

• Producers

• Primary consumers

• Secondary consumers

• Decomposers