Look at the diagram. It follows energy through a plant cell from sunlight to the ATP the cell spends. Which organelle belongs in the blank box?

Look at the cycle diagram of a leaf cell in daylight. Which statement belongs in the blank box?

Root cells of a maize plant are buried in soil and never receive light. Which process or processes run in those cells?

A leaf cell is in bright sunlight at midday. Which organelle is taking carbon dioxide in, and which is giving carbon dioxide out?

Animal cells carry out cellular respiration but never photosynthesis.

Which statement is true of cellular respiration but not of photosynthesis?

Look at the diagram. It traces what photosynthesis makes and what cellular respiration returns. Which pair of substances belongs in the blank box, ready for photosynthesis to use again?

Look at the cycle diagram for a sealed jar holding pondweed, water and a pond snail in the light. Which stage belongs in the blank box?

A sealed glass terrarium holds moist soil, a small fern and a beetle, and sits on a bright windowsill. Both organisms stay alive for weeks. Which exchange makes that possible?

Which equation summarizes aerobic cellular respiration?

In a leaf cell, glucose made in the chloroplast is later used by the same cell for energy. What happens to that glucose?

Look at the cycle diagram, which follows one carbon atom through a plant. Which stage belongs in the blank box?

Look at the diagram of where a tree's mass comes from. Which input belongs in the blank box?

Jan Baptist van Helmont grew a willow in a weighed pot of dried soil for five years. The willow gained about 74 kg while the soil lost under 100 g. He added only water. Where did most of the willow's added mass come from?

A plant, air and water are sealed in a flask that nothing can enter or leave. The flask is left through many light and dark periods. What happens to the total mass of the flask and its contents?

Look at the cycle diagram of one leaf across 24 hours. Which stage belongs in the blank box?

Look at the diagram of one leaf's overall gas exchange at three light levels. Which result belongs in the blank box for dim light at dawn?

Cellular respiration in a plant stops when the sun goes down.

Two sealed tubes each hold a leaf and an indicator that changes color with carbon dioxide. Tube A sits in bright light for three hours and Tube B in a dark cupboard. Carbon dioxide falls in A and rises in B. What explains this?

A greenhouse tomato plant gains mass steadily over a week. What must be true of its two processes across each full 24 hours?