Can someone explain the water and nutrient mechanisms in plants?
water and nutrient uptake mechanisms*
Role of translocation in plants?
Translocation in plants is basically the movements of materials throughout the leaves and to tissues throughout the plant. The things involved in it are the phloem, xylem, pressure of the flow etc.
Translocation is the movement of materials from leaves to other tissues throughout the plant.
If you check out this website, you will have what you need, but keep in mind that plants cells, like many other cells, move material due to concentration gradients.
What is transpiration?
Transpiration is the process by which moisture is carried through plants from roots to small pores to the underside of leaves, where it changes to vapor and is released into the atmosphere. Transpiration is essentially the evaporation of water from plant leaves.
I only want to add that transpiration rates are often regulated by stomata on the underside of the plant's leaves. This is really important in dry environments like where we live.
What is a Auxin?
A hormone that influences cell growth rates.
But with auxin it's important to remember that it works opposite (of what I initally thought at least...)
When a plant wants to grow, auxin is sent to the side of the plant not near the sun. This causes additional growth that reroutes growth to be towards the sun (phototropism.) Auxin also plays a role in the root elongation and inhibition.
The Auxin pumping creates an acidic environmnet that breaks down the cellulose somewhat and allows the internal pressure of the plant cells to push outward. This means that the cell on photo side experience a relative shortness compared to these auxin influenced cells. And if you can imagine these two forces we then see a growth towards the light source.
Why are photoperiods important?
It allows flowering to occur at the appropriate time.
It simulate a seasonal change and therefore can be used to "trick" the plant into doing what we want it to do.
What is the main purpose of the phloem?
The phloem transports organic compounds throughout the plant.
What is the difference between xylem tissue and phloem tissue?
Xylem tissue is used for transportation of water throughout the plant while phloem tissue transports organic compounds such as sugars, amino acids, and other solutes throughout the plant.
Differences between light-dependent reactions in photosynthesis vs. light-independent reactions? When do they occur during photosynthesis?
Light dependent reactions require light and water and occur in the thylakoids, and produce ATP and NADPH. This is the first stage of photosynthesis.
Light independent reactions (Calvin Cycle) require carbon dioxide, occur in the stroma, and produce high energy sugars. This is the second stage.
Pr vs Pfr and the function of both in plants?
Pr is converted into Pfr when absorbing red light of 660nm and when Pfr absorbs far-red light of 730 nm it is converted to Pr. Both are phytochrome and they regulate development processes.
Explain the difference between transpiration and translocation.
Be sure to look above at the other responses.
What role does mitosis play in stem extension?
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