Activity 3: Chloroplast Site of Photosynthesis - National Evangelical Institute PDF

NATIONAL EVANGELICAL INSTITUTE FOR GIRLS AND BOYS ‫مدرسة الفنون اإلنجيلية الوطنية للبنات والبنين‬ Marwa Al Reesh Teacher’s Name: Subject: Biology School Y...

NATIONAL EVANGELICAL INSTITUTE FOR GIRLS AND BOYS ‫مدرسة الفنون اإلنجيلية الوطنية للبنات والبنين‬ Marwa Al Reesh Teacher’s Name: Subject: Biology School Year: 2024-2025 Grade/Section: First secondary (A-B-C) Date: October 2024 Duration: Activity 3: The Chloroplast, Semester: First Exam No.: Site of Photosynthesis Student’s Name: Activity 3: The Chloroplast: Site of Photosynthesis Plants are autotrophic organisms that are able to make their own organic food by photosynthesis. Plants need water, CO2 and sunlight to make photosynthesis. In plants we have two types of cells: Cell membrane  Cells Non chlorophyllic cells Chlorophyllic cells - Do not have - Have chloroplast that chloroplasts (no contains chlorophyll chlorophyll) - Are able to make - Are not able to make photosynthesis photosynthesis Compare between chlorophyllic and non chlorophyllic cell. Similarities: Both have cell wall, cell membrane, cytoplasm, nucleus and vacuole Differences: A chlorophyllic cell has chloroplasts, while a non-chlorophyllic cell doesn’t have. ************ 1) Do you think that chlorophyllic cells make organic substances for its nutrition only? No, organic substances are synthesized in the leaf then distributed to all parts of the plant (for all the plant cells, chlorophyllic and non chlorophyllic cells). Refer to page 28: Observe the structure of chloroplast. Refer to documents "d" and "e" page: 23 Doc d: chloroplasts organelles show dark blue grains when treated with iodine solution. Doc e: Chloroplasts organelles with no dark blue grains when treated with iodine solution. a) Interpret the results of experiment documents "d" and "e" page 23. Given: starch + iodine dark blue color In presence of sunlight, dark blue grains appear in the chloroplast with iodine test indicating the presence of starch, while in the absence of sunlight; no dark blue grains appear in chloroplast with iodine test indicating the absence of starch. Thus, only in presence of sunlight starch is synthesized in chloroplast by photosynthesis. b) Draw out the site of photosynthesis. Hence, chloroplast is the site of photosynthesis. Probing the activity page 23: 4. An epidermal fragment of a red rose doesn't give dark blue coloration with iodine test indicating the absence of starch. This is because it doesn't contain chlorophyllic cells and so it cannot make photosynthesis. Non green cells obtain their food from chlorophyllic cells. 5. Chloroplasts are located in the leaves that are mostly exposed to sunlight. Activity: Plant A is placed in absence of CO2 while plant B is placed in medium rich in CO2. After few days, leaves from every plant are removed and treated with hot ethanol and iodine solution and its cells are observed under the microscope. a) Draw and label cell from leaf A. b) Draw and label cell from Leaf B.