In an expirement mature leaves on the plant were enclosed for a fixed ...
Plants have chlorophyll that uses sunlight to gather energy. The energy is then used to change carbon dioxide from the air into sugars like glucose. The plants then load the sugars from the leaves into the phloem in preparation for transport to other areas of the plant. Actively growing regions of plants need glucose for energy purpose and glucose is immediately transferred to such regions, hence high level of radioactivity will be found in such regions
In an expirement mature leaves on the plant were enclosed for a fixed ...
Introduction:
In this experiment, mature leaves on a plant were enclosed in a transparent bag containing radioactive CO2 for a fixed amount of time. The objective is to determine the part of the plant where maximum radioactivity will be found after some time.
Answer:
The maximum radioactivity will be found in the actively growing region of the plant.
Explanation:
When a plant performs photosynthesis, it takes in carbon dioxide (CO2) from the atmosphere and converts it into glucose, which is used as energy for growth and development. In this experiment, the transparent bag contained radioactive CO2, which means that the carbon in the CO2 was radioactive.
Process of photosynthesis:
1. Carbon dioxide enters the plant through small openings called stomata, primarily located on the underside of leaves.
2. Inside the leaf, CO2 is converted into glucose through a series of chemical reactions that take place in the chloroplasts.
3. Chloroplasts are mainly present in the actively growing regions of the plant, such as the apical meristems and leaf buds, where cell division and growth occur.
Reasoning behind the answer:
1. The actively growing regions of the plant require a high amount of energy for cell division, elongation, and differentiation.
2. To meet this energy demand, these regions have a higher rate of photosynthesis compared to other parts of the plant.
3. Since the experiment involved enclosing mature leaves in a transparent bag with radioactive CO2, the actively growing regions would have a higher uptake of radioactive CO2 due to their higher metabolic activity.
4. Consequently, the actively growing regions of the plant, which include the apical meristems, leaf buds, and young leaves, would accumulate the maximum radioactivity over time.
Conclusion:
In this experiment, the maximum radioactivity will be found in the actively growing region of the plant. This is because these regions have a higher rate of photosynthesis, leading to a greater uptake of radioactive CO2 and accumulation of radioactivity over time.
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