Questions tagged [plant-physiology]

Study of the normal functioning of plants and plant cells

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In traditional plant cloning, why do we require two different vectors (plasmids)?

So I was recently taught cloning in plants and I came to wonder what is the need to first put the gene of interest in the entry vector plasmid and then the final vector plasmid before finally ...
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Is there always a leaf(s) attatched to an auxillary bud?

I'm trying to create a 3D functional-structural plant model and I need to establish some axioms. Is it guaranteed or extremely likely that where auxiliary bud forms there's a leaf(s) attached? That's ...
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Photolysis of water

Photolysis of water releases $\text{O}_2$, $\text{H}^+$ ions and $\text{e}^-$. $\text{Mn}$ in the $\text{O}_2$ evolving complex also produces $\text{e}^-$. What provides $\text{e}^-$ to P680:$\text{Mn}...
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Is it scientifically sound to pool repeated measurements?

I am measuring specific phenolic compounds in leaves of A. thaliana. I have many different varieties, and different treatments. Initially I was measuring one leaf per plant for three plants for each ...
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scientific reasons behind a a sudden yet temporary growth sprout of the plant when the soil has No depth?

Sorry, I'm kind of naive when it comes to plant biology. Mark 4:5-6( New American Standard Bible 1995 ) 5 Other seed fell on the rocky ground where it did not have much soil; and immediately it ...
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Difference between "biotroph" and "parasitic"

In the studying process for my exam I learned about ways of life of pathogenes in plants. There, it was mentioned, they can live nekrotrophic, hemibiotrophic or biotrophic. As far as I understand, a ...
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Calculation of solute, pressure and water potential

What would be the water potential (Ψw), solute potential (Ψs) and pressure potential (Ψp) at equilibrium when a cell with Ψs= – 0.7 MPa and Ψp= 0.7 MPa is placed in a solution with Ψs= – 0.5 MPa? (...
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How long can zooxanthellae survive on their own, after being expelled from coral after a bleaching event?

So many sites (and books and journals and such) discuss how long different types of coral can survive without their dinoflagellate algae (zooxanthellae), but... How long can the poor little symbiotic ...
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How much sunlight is required for photosynthesis to peak?

I've read that photosynthesis peaks at some point over light intensities https://en.wikipedia.org/wiki/PI_curve According to https://www.bbc.co.uk/bitesize/guides/z9pjrwx/revision/5 suggests At very ...
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Why does secondary active transport occur in the companion cell during active loading of sucrose into the sieve tube element?

So, during the active loading of sucrose into the sieve tube element from the companion cell, hydrogen ions are pumped outside the cell by active transport through carrier proteins. The high ...
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Issues obtaining Fo in DIY Imaging Fluorometer

I have successfully built an imaging fluorometer at home (see project details here) and so far is working amazingly well. But I am having serious issues in obtaining Fo to calculate Fv/Fm (Fm-Fo)/Fm. ...
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vitamin D in mushrooms

How could I test vitamin D levels in mushrooms? (I am a high school student, our lab is pretty modern, but my resources are limited) I found an article about it (https://www.hindawi.com/journals/jfq/...
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Hydrostatic pressures in xylem transport

Plant transport has always been a confusing area for me especially when pressure potential is being discussed. How is the plant creating the negative fluid pressure at the top of the plant and why is ...
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What is the limiting factor for algal growth in the oceans?

As far as I can tell, pelagic algae require four main things to live: sunlight, carbon dioxide, trace minerals and physical space. What is the limiting factor? Note this is kind of a deceptive ...
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Chemiosmotic hypothesis [closed]

During the transport of electrons, some H+ are removed from the chloroplast stroma, which causes a proton gradient to build up inside the thylakoid lumen. But what's the source of H+ in stroma at the ...
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Why does xylem and phloem "reverse" between the stem and leaves?

Why does xylem and phloem change places (in the stem they are located in the interior, while in the leaves they are located on the exterior of the vascular bundle) ?
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Nastic movements in Insectivorous plants

Questions: What type of plant movement is shown by each of Sundew, Venus Flytrap and Pitcher Plant? What is the mechanism of the movement? Can a movement be both Chemonastic and Thigmonastic? If yes, ...
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In phloems, does the sap move through the sieve element cytoplasm?

We know that in xylems, the water move through the lumen of the vessel elements and move to the other vessel element through a pit. As the vessel elements are dead , there is no cytoplasm to block ...
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If stomata is closed at night ,how does exchange of oxygen take place at night? [closed]

In this article in the second paragraph, it is written that the stomata remains closed at night to reduce water loss. We know that the plants respire and take in oxygen at night. Then how do plants ...
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How do plants know to grow towards the light? [closed]

Plants lack a central nervous system. How do they know to drop leaves in full shade and to curve stems towards the current light source?
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Does the generative cell have centrioles?

I have read that most plant cells lack centrioles, though it may be seen in some lower plants. But what about the gametophyte of higher plants, angiosperms specifically? As this diagram shows- The ...
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Does Ethylene Triple response provide any advantage to the Arabidopsis thaliana Etiloated seedling,?

As ethylene has a triple response effect on Arabidopsis thaliana Etiloated seedling- 1 Shortening and thickening of Hypocotyl 2 Exaggerated apical hook 3 Short root According to this site Ethylene ...
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Why Plants growth has a significant contribution of cell elongation growth?

Plant Growth is characterised by three phases- Cell division , Cell elongation and Cell maturation, where Maturation is just specilisation of cells, Only major contributory effect in growth is of cell ...
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The reason behind red drop effect

I was reading about Emersion effect on Wikepedia, I was not able to correlate our current knowledge of photosynthesis with this effect, First red drop effect When Emerson exposed green plants to ...
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Why and how do Stomatal Guard cells turn flaccid at night time and cloudy days, and turgid during the days?

If I'm correct, the guard cells turn turgid during the day and flaccid at nights. What is the reason behind the same and how is it done? (im a noob highschool student, so basic explanations are ...
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Will plant cells absorb "atypical" chemicals dissolved in water, by diffusion or otherwise?

I want to know what determines whether a chemical dissolved in water, will or will not be absorbed into a plant. I imagine this can happen at a few different levels -- through roots, or at a cellular ...
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What causes the distinct color change in matured leaves in some plants?

Maybe that color change is caused by lower chlorophyll concentration in younger leaves' cells, or chlorophyll a to b ratio differs between younger and older leaves. All I could find is that the ...
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Can Monsanto's (in)famous hybrid seed crops be cloned/grafted? If not, is there a technical or legal reason?

I understand that the seeds of a crop made from modern-day super hybrids will not, usually, produce the same quality plants in the next generation. Therefore, farmers have to buy new hybrid seeds each ...
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How does a diploid sporophyte form in non-recurrent apomixis?

I came across this definition of non-recurrent apomixis which occurs in angiosperms- In non-recurrent apomixis, both the egg-cell and embryo are haploid and embryo is developed directly from an egg-...
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What actually kills a plant that requires winter dormancy if it is kept indoors all year?

In bonsai practice, beginners will commonly purchase a juniper (often Juniperus procumbens 'Nana'), which is an outdoor tree, and keep it inside all year. The tree invariably dies. It is commonly ...
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Is there a scale suitable for continuous tracking and recording of plant weight?

I want to measure water transpiration and evaporation in a bonsai tree, and measuring the weight of the tree in its pot is my proxy for water usage. This has worked well with manual measurements, but ...
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Can plants absorb organic compounds?

Plants are autotrophs, meaning that they grow by building organic matter out of inorganic compounds (and energy). Is it then also true that plants are generally not capable of absorbing organic ...
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Do spring varietes of cereals have a process of vernalization?

I was wondering about this question - Do spring varieties of cereals have some process of vernalization? It would be nice to have some description of the main processes' differences of spring and ...
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Regarding secondary growth in dicotyledonous angiosperms

I had read that (and as this image shows) the secondary and primary phloem eventually get crushed due to the repeated division of cells forming the secondary xylem, during secondary growth in ...
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What will happen if one keeps the photosynthesis plant active 24x7? [closed]

While reading this article online something said on it made me wonder. Also, there have been suggestions and a Dawn / Dusk type of ramp up and down to simulate the slow changes in the sun have value, ...
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Production of plant derivatives using genetic engineered micro-organisms

I saw a Thought Emporium video where spider silk was produced by genetically modifying yeast. I have also read about companies making vanillin (vanilla flavour) using this technique. I am curious to ...
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What is the mechanism by which seeds stay alive while in storage? [closed]

I know folks who store seeds for months and sometimes a year before planting them. What is the mechanism by which they stay alive? Also some associated questions: How do the cells in the seed stay ...
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How to extract oxygen from grow chamber

I have been developing LED grow lights for a year or so and one of the things I am trying to do is to build a grow chamber where I can control temperature, humidity, light intensity and quality and ...
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4 votes
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CAM Photosynthesis Oxygen Generation?

I've been looking into CAM plants - notably the snake plant which is native to West Africa. Upon researching the CAM photosynthesis cycle, I've found it fascinating that the plant stores CO2 at night ...
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What material is permeable for plant roots, but "impermeable" for fungi & bacteria?

I'm designing an experiment where the roots of the plant will grow in a sterile environment while the shoot will grow in a non-sterile grow room. For this reason the environments of the shoot and the ...
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Hybrid seed production requires a male sterile parent. Why?

Hybridization is the process of crossing two plant species or varieties. In this case, two varieties of plants. In plant breeding, crossing is a very useful technique to improve the features of the ...
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Is there a known efficiency rate for CO2 capture from ambient air in photosynthesising plants?

When humans take in air to their lungs, we capture about 5% of the total quantity of the air as oxygen (which in turn equals about 24% of the available oxygen in the air) Is there an equivalent rate ...
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Osmotic pressure and turgor pressure details

I am a high school student and I am very confused in how we define osmotic pressure? Osmotic pressure is defined as the pressure required to stop the diffusion of solvent into a solution by applying ...
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Plasmolysis and turgor pressures

I am a high school student and I am a little confused in plasmolysis, when we study plasmolysis, we say that at limiting plasmolysis, the turgor pressure OR pressure potential reduces to 0 what do we ...
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Light intensity effect on plant transpiration

In the graph of light intensity versus rate of transpiration, the rate increases up to a certain point but then remains constant. What is the reason that it stays constant, is there a limiting factor ...
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Why certain COGs appears more often in Humans Bacteria but not in plants Bacteria

I'm doing a Bioinformatic project from the university where I got a DB of COGS from Human & Plants Bacteria genomes and I need to find distinguishing sets in this DB and explain the biological ...
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Does every ovule undergo fertilization at the same time?

After fertilization ovary becomes the fruit and ovules develop into seeds. Does this mean that all the ovules undergo fertilization at the same time?
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What is the use of having 3 antipodal cells and 2 synergids?

The embryo sac which is developed from functional megaspore contains 8 nuclei.2 polar nuclei and egg fuses with sperms.3 antipodal cells and 2 synergids degenerate after fertilization.Then what is the ...
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Why doesn't the rate of photosynthesis increase with increasing light energy (frequency)? [duplicate]

Why doesn't the rate of photosynthesis increase with increasing light energy (frequency)? I know that green light is not absorbed by chlorophyll, yet I am confused as to why this certain "...
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Have cruciferous vegetables been genetically altered to reduce cooking odors?

As a young girl my mother always kept a bottle of "Air Wick" under the kitchen sink. When she cooked cabbage, cauliflower, broccoli, etc., she would open the bottle, pull out a green sponge ...
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