5.9/5.10

Many animals in an ecosystem depend on other animals for —

• air
• energy
• shelter
• water

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?

• Carbon dioxide levels increase
• Oxygen levels increase
• Carbon dioxide levels decrease
• Nitrogen levels decrease

The diagram shows a woodlands food chain.
What is the role of the sunflower in the food chain?

• To make energy available directly to the hawk
• To use the sun’s energy to produce food
• To break down waste products left by squirrels
• To provide a place for the hawk to build its nest

Camels live in the desert and have wide, flat, leathery pads on the bottoms of their feet. This adaptation most likely helps them –

• walk on hot sand
• find sources of water
• climb rocky hills
• sleep standing up

Plants are interacting directly with another living element of their environment when they are - 

• soaking up water
• absorbing sunlight
• attracting insects
• taking in carbon dioxide

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

• Severe loss of vegetation
• Migration of small mammals 
• Increased seedling germination
• Increased populations of insects

Which of these correctly lists the stages of incomplete metamorphosis in the order in which they occur?

• Larva, Pupa, Adult
• Egg, Nymph, Adult
• Egg, Pupa, Adult
• Larva, Nymph, Adult

Ecosystems are classified on the basis of variables such as

• temperature
• primary producers
• soils
• all of the above

Which organism would be LEAST likely to live in a desert?

• Cactus
• Snake
• Alligator
• Tarantula

Which sentence best describes the relationship between climate and ecosystems?

• Climate does not affect ecosystems
• Climate determines the nature of ecosystems
• Climate is determined by ecosystems 
• Climate is a minor factor in ecosystems