2nd 6 Weeks Reassess

Some students are studying the relationships between organisms in a food web. How many predators in the food web are carnivores?  

• 1
• 2
• 3
• 4

Some moths have a brown body and brown wings while other moths have a white body and white wings. The brown moths often rest on the bark of pine trees and the white moths rest on the white bark of aspen trees.  If all the aspen trees in an area were cut down, what would be the likely result?

• The population of white moths would decrease while the brown moths would stay about the same.
• The population of brown moths would decrease while the population of white moths stayed about the same. 
• The white moths would turn brown and then their population would increase. 
• All of the brown moths would migrate to a new location. 

Copper compounds are used in large amounts to control the growth of algae and other aquatic plants.  Copper interferes with photosynthesis in these organisms.  What would be the most likely result of a spill of these compounds in an aquatic environment? 

• The amount of algae and aquatic plants would increase causing the surface of the water to be covered.
• The amount of algae and aquatic plants would decrease causing an increase in carbon dioxide in the water.
• The amount of algae and aquatic plants would decrease causing an increase in oxygen in the water.
• The amount of herbivorous fish would increase causing overpopulation. 

Many caves in Texas provide a habitat for animals that live in total darkness.  The caves are damp and cool, and most of the caves are rich in the mineral calcite.  The diagram shows the relationship of some organisms involved in a cave ecosystem. Based on the diagram, which of the following statements is valid?  

• Owls are predators of moths, and moths are predators of bats
• Beetles compete with bats and cave spiders
• Millipedes compete with springtails and beetles
• None of these

A student tests an element and finds it to be malleable, a good conductor of electricity, but not attracted to a magnet. Which of these is most likely to be the element tested by the student?

• Copper
• Sulfur
• Oxygen
• Carbon

What is the mass number of a magnesium (Mg) atom that has 12 neutrons?

• 12
• 24
• 20
• 39

Which set of elements represents a period on the periodic table?

• H, He, Ar, Xe, and Rn
• K, V, Fe, Ga, and Kr
• N, P, As, Sb, and Bi
• La, Pa, Sm, Tb, and Yb

A researcher wants to experiment with an element that reacts like Sulfur but has a larger mass.  Which element should the researcher use?

• Oxygen
• Selenium
• Phosphorus
• Chlorine

The equation below represents a chemical reaction that occurs inside living cells. How many atoms are represented in the reactants of this equation?

• 12
• 24
• 26
• 36

8  The chemical reaction shown below involves the reaction of silver nitrate with potassium chloride.        What evidence of a chemical reaction will be observed based on this chemical reaction?

• Gas formation
• Flash of light
• Decrease in mass
• Formation of a precipitate