1. Tuesday Review March 19, 2013

2. Letter X represents the gas that plants need to produce their own food
Letter X represents the gas that plants need to produce their own food. What is this gas?
A. Oxygen
B. Petrolium
C. Nitrogen
D. Carbon dioxide

3. Plants and animals that live on land exchange carbon dioxide and oxygen through the –
A. food chain
B. ocean
C. soil
D. atmosphere

4. Huge areas of the Amazon Rainforest are being cut down
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 increase
B. Oxygen levels increase
C. Carbon dioxide levels decrease
D. Nitrogen levels decrease

5. The carbon dioxide-oxygen cycle is important to animals because it provides –
A. a gas they take in when breathing
B. fresh water for their survival
C. chemicals that build bones
D. energy they need to move

6. 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 by
humans 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 snakes
B. roads built on the island
C. lizards living in the trees
D. hours of sunlight each day

7. If humans over-hunted a population of insect-eating birds, what immediate change would likely be seen in the area?
A. Severe loss of vegetation
B. Migration of small mammals
C. Increased seedling germination
D. Increasing populations of insects

8. 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 introduction
of pigs to the Hawaiian rainforest ecosystem?
A. Fewer plants to hold soil in place
B. More kinds of insect species
C. Less rainfall throughout the year
D. Increased destruction by volcanoes

9. Which of these adaptations most help the hawk keep other hawks out of its territory by warning them from far away?
A. Brown head
B. Loud call
C. Hollow bones
D. Sharp claws