1. Student Exploration Photosynthesis Lab Answers

Photosynthesis is a process in which plants convert light energy (sunlight) into usable chemical energy (carbohydrates). Reactions and the light independent reactions (Calvin Cycle).

Student Exploration Photosynthesis Lab Answers

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This lab tested the ability of plant cells to carry out photosynthesis in varying intensities of light. One dish of leaf disks was placed in the dark, one dish under the room lights, and one dish 25 cm from a light source. To measure photosynthetic activity, leaf disks were cut from spinach leaves and the oxygen stored in the leaves was removed by applying a vacuum. This caused the leaves to sink to the bottom of the flask. Leaf disks that sunk to the bottom of the flask were transferred to petri dishes containing bicarbonate.

When exposed to adequate light, photosynthesis occurred in the leaf disks. The leaf disks used bicarbonate as a source of carbon dioxide for photosynthesis and produced oxygen as a bi-product. Oxygen production, and thus photosynthesis, was indicated by floating leaf disks.

Hypothesis: The greater the light intensity, the greater the rate of photosynthesis and the greater the production of oxygen by plant leaf disks. Questions. Which sample was the negative control?. What is the chemical formula for photosynthesis?. What was the independent variable?. What was the dependent variable?. What is the end product of photosynthesis and what is the purpose of the end product in the plant?.

True or False: Plants synthesize food (organic compounds) from inorganic compounds. What information did the floating leaf disks give you in the experiment you performed in lab?. What is the energy source for photosynthesis? Written by Nickie Cauthen, page designed by Michelle Furlong and media by Christopher Kodani and Barbara Foster, Clayton State University Morrow, GA Copyright 2002 – Department of Natural Sciences, Clayton State University. Do not copy or use anything from these pages without written permission.