Which of the following best explains how stems transport water to other parts of the plant?

• through a chemical called chlorpphyll
• by using photosynthesis
• through a system of tubes
• by converting water to food.

Which of the following gases do plants use in photosynthesis?

• hydrogen
• oxygen
• carbon dioxide
• carbon monoxide

Which  of the following is broken down in the bod to release energy?

• sugar
• water
• salt 
• oxygen

Which of the following is produced when sugar is digested in an animal cell?

• carbon dioxide
• chlorophyll
• oxygen
• sunlight

A group of students are building a model of an ecosystem.  Which of the following organisms should the students select to act as a decomposer?

• turtle
• flower
• mushroom
• spider

Decomposers are important in the food chain because they

• produce their own food using light from the sun
• stop the flow of energy from one organism to another
• break down dead organisms and recycle nutrients into the soil.
• are microscopic and other organisms cannot consume them.

Which of the following is a living component of a desert in California?

• low rainfall
• hot temperature
• polar bear
• horned lizard

Salt concentration, water temperature, plankton, and the whale shark might all be used in a description of an ocean?

• climate
• food web
• ecosystem
• population

Which characteristic of the plants would most likely affect the plants' growth?

• leaf shape
• light requirement
• plant price
• flower color

Which animals are most likely to carry the seeds found in berries from the parent plant to another area?

• bees
• birds
• flies
• caterpillars