A gardener notices that a leaf pulls one gas out of the surrounding air on a sunny morning. Which gas does photosynthesis take in from the air?

A tank of fresh pond water holds a healthy green plant under a bright lamp all afternoon. Which gas does photosynthesis release into the water?

A mouse's cells break down sugar from the seeds it ate. Besides sugar, which substance must enter those cells for cellular respiration to happen?

Cellular respiration releases energy a cell can use. Besides that energy, which two substances come out of the process?

Photosynthesis turns light energy into chemical energy the plant can store. Which product of photosynthesis holds that stored chemical energy?

Roots pull one substance up from the soil while leaf openings let another in from the air. Which pair enters a leaf's cells as inputs for photosynthesis?

Photosynthesis needs an outside energy source that cellular respiration does not need. What is that energy source?

A student compares a leaf cell with a skin cell under a microscope. In which part of the leaf cell does photosynthesis happen?

Sugar reaches a cell and its stored energy is released for the cell to use. Which cell part releases that energy?

Plant cells contain mitochondria and carry out cellular respiration as well as photosynthesis.

Only producers such as plants and algae carry out cellular respiration.

A pond holds green algae in the water, minnows swimming near the surface, and mushrooms growing on a fallen log. Which of them makes its own food using light energy?

Over one summer a corn plant grows taller and heavier. Where does most of the matter that builds its new leaves and stalk come from?

A deer grazes on grass in a meadow and then runs to the tree line. Where did the energy for that run originally come from?

A potato plant stores sugar and starch underground. After a person eats the potato, what happens to the energy stored in it?

A sparrow eats sunflower seeds and uses the energy to fly. Its cells give off carbon dioxide as they break down the seed sugar. How can a sunflower plant use that carbon dioxide?

Small bubbles rise steadily from a green water plant standing in a beaker of water under a bright lamp. Which process produces the gas in those bubbles?

Damp bean seeds sprouting inside a closed flask sit in a dark cupboard, and a thermometer shows the seeds are 4 degrees Celsius warmer than the room. Which process explains the warming?

A leafy plant sits in a sealed clear box under a bright lamp. A sensor shows the carbon dioxide inside falling from 400 units to 260 units in one hour. Which process explains the drop?

A sealed jar holds pond water and several water snails, and is kept in a dark closet. The dissolved oxygen in the water slowly falls. Which process explains the fall?