Tuesday ReviewMarch 19, 2013

Letter X represents the gas that plants need to produce their own food. What is this gas?

A. OxygenB. PetroliumC. NitrogenD. Carbon dioxide

Plants and animals that live on land exchange carbon dioxide and oxygen through the –

A. food chainB. oceanC. soilD. atmosphere

Huge areas of the Amazon Rainforest are being cut down. What effect could this have on the carbon-dioxide and oxygen cycle if the removal of so many plants and trees continues?

A. Carbon dioxide levels increaseB. Oxygen levels increaseC. Carbon dioxide levels decreaseD. Nitrogen levels decrease

The carbon dioxide-oxygen cycle is important to animals because it provides –

A. a gas they take in when breathingB. fresh water for their survivalC. chemicals that build bonesD. energy they need to move

Information on the brown tree snake and the habitat on the island of Guam are given here.

The brown tree snake was introduced to the island of Guam byhumans in the 1950’s. What direct effect did the introduction of the tree snake likely have there? The island today probably has fewer –

A. humans bitten by snakesB. roads built on the islandC. lizards living in the treesD. hours of sunlight each day

If humans over-hunted a population of insect-eating birds, what immediate change would likely be seen in the area?

A. Severe loss of vegetationB. Migration of small mammalsC. Increased seedling germinationD. Increasing populations of insects

Humans brought the first pigs to Hawaii more than 1,000 years ago.The pigs have no predators and eat nearly anything. Which of the following is a negative impact that might result from the introductionof pigs to the Hawaiian rainforest ecosystem?

A. Fewer plants to hold soil in placeB. More kinds of insect speciesC. Less rainfall throughout the yearD. Increased destruction by volcanoes

Which of these adaptations most help the hawk keep other hawks out of its territory by warning them from far away?

A. Brown headB. Loud callC. Hollow bonesD. Sharp claws