a. the production of bubbles by the plant when it is in darkness
Explanation:
The indirect observation that will show that the gas produced in this experiment is oxygen is by observing the bubbles on the surface of water in darkness.
Oxygen gas is a by product of photosynthesis. Photosynthesis occurs in the dark and when there is light.
If we observed the bubbles over water, it shows that oxygen gas is given off and the water plant is photosynthesizing. This is a good way to observe the oxygen gas indirectly.
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Answer:
Herbicide essentially replaces sugar with itself during uptake by plants.
Explanation:
Noting that the pH is decreased around the plant cells indicate that there is an acidic environment that exists, It also indicates that the cell wall had been perforated and the contents are being expelled or at the very least leaking.
The ability for the plant to break down and use sugar is vital for its survival. Most herbicides are in the form of glycophosphates and it moves along with the sugar in the plant that have been treated with herbicides through the transport vesicles, the xylem and phloem.
This causes an imbalance in the available sugars that are able to be taken up by the plant since much of it is replaced by the herbicide.
Photosynthesis allows autotrophs to make their own food, then in turn heterotrophs eat the autotrophs giving them food. It's like a big cycle!