STAAR Review

Which of the following characteristics is shared by both primary and secondary consumers?

• Uses the Sun’s radiant energy to produce food
• The first step in any food chain diagram
• Eats only plants to gain needed energy
• Gains energy by eating other living things

An energy pyramid is shown. At which level of the energy pyramid would most of the biomass be found?

• Top Predator
• Carnivore
• Herbivores
• Producers

A diagram of a prairie food web is provided. A reduction in deer population will have the effect in the amount of energy this ecosystem is able to provide for which of the following organisms?

• Rabbit
• Mountain lion
• Mouse
• Hawk

Which of the following lists of elements includes those commonly found in organic compounds?

• Copper, iron, zinc, and aluminum
• Neon, helium, argon, and xenon
• Hydrogen, oxygen, phosphorus, and nitrogen
• Boron, silicon, arsenic, and selenium

A portion of the Periodic Table is provided here. Which of the following compounds is organic?

• CaH₁₀P₄K₃O₄
• C₆H₁₂O₆
• Fe₂O₃
• NaCI

Which of the following is an example of a chemical change during digestion?

• Food particles are churned in the stomach
• Teeth mash food into smaller pieces so it can be easily swallowed
• Protein is broken down into amino acids in the stomach
• Contractions in the esophagus forces food into the stomach

The table provides information on the function of different
digestive structures. Which of the digestive structures in the table can cause a chemical change to occur?

• Teeth
• Tongue
• Esophagus
• Stomach

Compounds are different than elements because compounds are -

• combinations of two or more elements
• not able to be broken down into parts
• made from the same type of atoms
• a pure substance, elements are not

The atmosphere of Earth is comprised mostly of oxygen and -

• carbon
• hydrogen
• silicon
• nitrogen

The table provided identifies a substance based on its density. A sample of an unknown substance has a mass of 28.8 grams and a volume of 4 cm³. Based on its density, it could be which of the following substances?

• Gold
• Iron
• Lead
• Tin