Transcript p.6
MISERABLE PLANTS' ANATOMY Content 1. Making an observation p.1 2. Proposing a hypothesis p.2 3. Doing an experiment p.3-4 4. Taking experimental results p.5 5. Drawing a conclusion p.6 6. Photo of experiment process p.7- 1. Making an observation We always see some leaves fall down from the trees, after several days, they become yellowing. If we do not give the plants water or sunlight, it turns yellow after several days. A lot of trees are cut down, but they did not die. p.1 2. Proposing a hypothesis The plants cannot live without some systems. Even there are water and light, the plants still cannot live without roots.Maybe it is because the plants cannot absorb water along. Roots do not have chloroplasts so they cannot carry out photosynthesis. p.2 3. Doing an experiment Materials: 1. 2 plants ( A & B ) 2. 4 cups ( S,X,Y,Z) 3. Some water 4. Iodine solution 5. A knife p.3 Procedure: 1.Put plant A and plant B in dark for 24 hours. 2.Then put plant A in cup S within water under the light. Plant B cut 1 leaf,some roots and 1 stem and put them into cup X, cup Y and cup Z within water under the light respectively for several days. 3.After several days,take plant A out and cut 1 leaf,some roots and 1 stem. Take plan B’s leaf,roots and stem out. 4.Finally drop some iodine solution to plant A and plant B’s leaf,roots and stem respectively. 5.Observe the result. p.4 4. Taking experimental results Several days later, the leaf in cup X changed to yellowing leafs. The stem in cup Z faded. The roots in cup Y,the plant A’s roots, stem and leaf were unchanged. After the iodine test,the leaf in cup X and the stem in cup Z changed brown as they did not contain starch,that means they cannot do photosynthesis.The roots in cup Y,plant A’s roots ,stem and leaf changed to dark blue as they contained starch,that means they can do photosynthesis. Destarching is putting the plants in dark for 24 hours.In this experiment, destarching is to have an accurate result.Plant A is a control experiment. p.5 5. Drawing a conclusion The plants can do photosynthesis when there are carbon dioxide, water and light, but without leaves, roots or stem, they cannot. In plants, photosynthesis takes place in chloroplasts. Leaves contain chlorophyll so that can carry out photosynthesis. Roots absorb water and minerals, they are important for plants. And water is transferred to the leaf by stems. Plants are control by every system. p.6 6. photo of experiment process Plant A and plant B Plant A and Plant B in the dark room p.7 leaf root stem p.8 leaf root stem p.9 The End