a scientist performs an experiment by placing petroleum jelly on the under side of the plants leaves. this blocks the leaves' stomata. the plant continues to be watered and is located in a sunny spot. What will the scientist observe?
If the scientist places petroleum jelly on the underside of the plant's leaves to block the stomata, several observations can be expected:
1. Reduced transpiration: Stomata are responsible for the exchange of gases in plants, including the release of water vapor through transpiration. By blocking the stomata, the plant's ability to release water vapor will be hindered. As a result, transpiration rates will be diminished.
2. Water accumulation: With reduced transpiration, the plant may start accumulating water within its tissues. This can lead to swollen or wilted leaves, as excess water is not being efficiently removed.
3. Reduced photosynthesis: Stomata are also essential for the entry of carbon dioxide into the plant for photosynthesis. By blocking the stomata, the plant's ability to take in carbon dioxide will be impaired. As a consequence, the rate of photosynthesis is expected to decrease since the plant is unable to efficiently convert sunlight into energy.
4. Leaf discoloration: The lack of sufficient carbon dioxide and reduced photosynthesis can affect the chlorophyll content in the leaves. This may lead to the leaves turning yellow or even bronzing due to the reduced production of chlorophyll pigments.
5. Growth inhibition: As a result of reduced water loss, photosynthesis, and limited gas exchange, the growth of the plant might be stunted. The plant may show slower growth, shorter stem and root elongation, and the overall health of the plant might be compromised.
In summary, by blocking the stomata of the plant's leaves with petroleum jelly, the scientist will observe reduced transpiration, water accumulation, decreased photosynthesis, leaf discoloration, and inhibited growth.