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Questions tagged [plant-physiology]

Study of the normal functioning of plants and plant cells

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Effects of tobacco smoke on plant health

We know that tobacco smoking is associated with a wide range of negative health effects in humans, which holds for active smoking, second hand smoking and probably even third hand smoking. What are ...
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15 views

What genes in a plant determine whether a stem is erect or climbing?

I was randomly reading this Wiki article on Jasmine and this question crossed my mind after reading the following lines: Jasmine can be either deciduous (leaves falling in autumn) or evergreen (...
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What is the electric field strength of microalgae?

Question: What is the electric field strength of microalgae? Background: So I have been having some problems with fungi contaminating my chromera velia algae cell cultures. I haven't determined what ...
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Regulation of LBD33 genes Arabidopsis. If LBD 33 gene is up-regulated by auxin then why does expression decrease when increasing auxin concentration?

I have a question regarding the regulation of lateral boundary domain genes in Arabidopsis (specifically LBD33). I am an undergraduate student trying to understand the results of a lab where I measure ...
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What makes the flowers glow?

I had learnt in a plant biology course that, all the flowers are actually originating from leaves, with several mutations. I wonder what makes a flower sparkly like this. Photos belong to a ...
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Why does the seed of the coconut tree have a liquid in it?

What is the purpose of water in the coconut seed? The reason I ask this is that I was reading about coconut water and all the benefits it has for us Humans. But why does the tree put a liquid in the ...
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Biological Nitrogen Fixation

I just studied Biological Nitrogen Fixation and saw it's reaction but i do not understand why there is 8 electrons and 8 protons are involved and Hydrogen molecule is formed side by side along with ...
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30 views

plant uptake of large molecules

I have read several studies concluding that plants can indeed take up molecules with a molecular weight largar than 390 g/mol. Does this mean plants do also take up large molecules like hormones if ...
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1answer
62 views

Difference between vacuolar and symplast pathway [closed]

what is the difference between Vacuolar Pathway and Symplast Pathway ? Is the symplast pathway does not take into account the vacuole to vacuole movement?
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solute potential of guard cells in stomata increases with glucose but not with starch

In sugar starch theory and potassium ion inflow theory the solute or osmotic potential increases with glucose, in guard cells but not with starch why? The same case is with malic acid i-e the solute ...
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1answer
54 views

Why was cotton chosen to grow on the moon?

The choice of plants for the first lunar ecosystem is a bit unusual. They are growing cotton, rapeseed and potatoes. Why did the Chinese scientists choose them? Is it because of their ability to ...
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1answer
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Why are Arabidopsis plant seeds being sent to the moon and not other seeds?

The latest Chang'e-4 rover brings an entire ecosystem with it, including Arabidopsis plant seeds and silkworms. My question is: why Arabidopsis? Is this question conclusive without having to ask ...
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What is difference between light harvesting complex , reaction centre and photosystem

my book says light harvesting Complex are made up of hundred of pigment molecule bound to protein. Is photosystem has all the pigment (except one molecule of chlorophyll A )forming light harvesting ...
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How does salt content affect flowering of halophyte?

My teacher told me that one adaptation of halophyte is that they flower at specific time e.g. rainy season to reduce salt exposure (as salt content affects flowering of plant thus affect the ...
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1answer
24 views

Do unique communities of bacteria form inside water storage in plants?

I assume that plants, like animals, have an ability to fight off bacteria that invade their cells (support: here and here. However, water often harbors quite a bit of bacteria in even unsuspecting ...
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Why does water stress lead to alkalinity of xylem sap in plants?

I was reading this book: Plant Physiology and Development, Sixth Edition by Lincoln Taiz, Eduardo Zeiger, Ian M. Møller, and Angus Murphy when this doubt came to my mind. Abscisic acid, the stress ...
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144 views

Why aren't leaves black?

I s'pose this is a variant of the age-old question, "Why are leaves green?" It's fairly easy to ask teh internets and find plenty of answers for that one. I have a different but related question: ...
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How does heat stress kill plants?

It is known that many plants typically die when exposed to temperatures of 40 to 50°C (I believe, these figures relate to exposure times of ~1–2 hours). When a plant is heated, what is the mode of ...
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374 views

What does the acronym ‘PIN’ stand for referring to PIN proteins in plants?

There are so called PIN proteins, or PIN-formed proteins, in plants. What does this acronym mean? Wikipedia briefly explains the function of the protein but not the origin of the name. It's not ...
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Why does photosynthesis occur even in blue light when the photocentres are activated in red light

From Engelmann's experiment Engelmann used this device to illuminate a strand of Cladophora (not Spirogyra) with light from the visible spectrum, exposing different sections to different ...
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Fruiting of trees — environmental stimuli and biochemical cascades

My question concerns fruiting of trees in general. However, I live in a tropical country (Philippines) where mango trees are ubiquitous, so I'll use it in stating my question. The question is about >...
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1answer
42 views

Do plants experience the following feelings

I am not a student of biology,in other words I have not read biology much. But I read that plants have life and so my question is the following: Suppose I take two saplings of two different ...
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Why are plants unable to take up Phosphorus directly in their organic form like Phytic Acid?

I am researching acquisition strategies of phosphorus by decidious trees. I am reading a lot that plants take up nutrients as their inorganic form. In the case of P according to literature this is ...
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168 views

Why is amylose insoluble in water?

In a handout the following is stated: Amylose is insoluble in water, therefore a good storage compound e.g. in stroma of chloroplasts This is with regard to the chemical structure of the molecule. ...
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41 views

Regarding plant stress

I have to plan a bioinformatic study on a plant. Microarray data is available for various stress treatments (drought, cold, osmotic and flood stress) on root and shoot tissues. I am a bit confused as ...
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Why does the iron content differ in different species on seeds?

Iron can be affected by pH of the soil but why does each species actually have a different iron content. What causes it? What genes cause it?
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How is the role of ethylene in ripening demonstrated in biology (or agriculture) education?

I want to know what are some typical experiments performed in the course of biology education (or possibly in applied biology education e.g. agricutlure education) to prove to the students (or have ...
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213 views

Is that true that plant stem cells can be used in humans?

I was reading an article (which seems very fake to me) on sensitive topics, but there was one astonishing statement: Stem cells are obtained from certain plants that grow all over the world. Once ...
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Why don't acacia trees prefer increasing tannin levels in their leaves rather than leaving them high?

According to this article, the Acacia tree has a chemical defence system which leads to the release of ethylene in the surroundings when a herbivore grazes on it. This leads to an increase in tannin ...
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How increase in temperature increase imbibition?

Through a source I came to know that imbibition is directly proportional to temperature.But, imbibition works on the principle of capillary action and adsorption which are inversely proportional to ...
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2answers
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Why do plants need oxygen through their roots?

I was asking myself why plants die from over-watering and the simple answer was that they can't get enough oxygen through their roots. But this made me ask myself why they need oxygen in their roots ...
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1answer
99 views

How do plants absorb CO2?

I see many repeated claims that plants absorb $CO_2$ from the air. $CO_2$ goes into the stomata, while $H_2O$ evaporates and leaves those same stomata. The $CO_2$ dissolves in the water in the plant ...
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Could higher carbon dioxide levels be beneficial to plants?

C4 plants take ATP-expensive routes to ensure photorespiration does not occur. They minimise oxygen concentration in cells where the Krebs cycle occurs and cart carbon dioxide into these same cells. ...
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Can you accelerate the growth of a plant by accelerating its surroundings?

I had this weird idea of making plants grow faster when I first visited an indoor nursery which used floodlights instead of sunlight. They turned on during the day and went off during night in cycles. ...
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Does the sun light have to have *direct access* to fruits to make them sweet?

I understand that sun light is needed for fruits to ripen. In the years with less sun light, the fruits are usually not so sweet. So the sun light is needed to make the fruits sweet. Where and how ...
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What is this plant? Lacy leaves small white flowers velcro like sticker

Small fern like plant with small white flowers and little round stickers like velcro. I found lots of little plants in my yard and they have tiny velcro like stickers. . I want to know what they ...
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Will imazapyr kill the roots of a plant if only the stem is exposed?

I know that if imazapyr ((RS)-2-(4-Methyl-5-oxo-4-propan-2-yl-1H-imidazol-2-yl)pyridine-3-carboxylic acid) is sprayed on the ground, roots of a plant can absorb it. However, if imazapyr is only ...
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Change of stomatal density in plant in response to soil water stress?

I was wondering if the stomatal density (the number of stomata per unit of leaf) will be changed in the plant, say in Arabidopsis thaliana in response to soil drought stress? Please kindly share me ...
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1answer
93 views

Can herbs absorb harmful substances leached in water supply

I have small herb garden (parsley, coriander mint and basil) that is watered from below by a hydrophilic filter using capillary action from a reservoir. This filter allows water soluble nutrients to ...
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1answer
413 views

From where does the oxygen in glucose come in photosynthesis?

Is it carbon dioxide or water? I'm talking about the oxygen present in glucose and not the oxygen that is released after photolysis of water.
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Fixing plant leaf tissue for tensile tests

I'm a new master's student in mechanical engineering, and I'm researching crop biomechanics. We need to do some tensile tests on samples of corn stalk sheath, which involves securely and evenly ...
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GABA in plants (article about its mechanism)

I am studing to plant physiology exam and i cross over the statment about GABA in plants. It said that level of GABA increasing my thermal shock. But mechanism of effect on plants is unknown. Can ...
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2answers
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What is the name of this plant with leaves having two different shades of green?

I am trying to find the name of this plant. I am attaching the relevant images. Thank you for your help. Location: Hyderabad, India
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Rubisco and Nitrogen Shortage Condition

Suppose a plant sprouted when $t=0$ and died when $t=T$. Let $t_*$ be the time when the plant shifts the resources usage to maximize its reproductive organ. In the case of nitrogen shortage during ...
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Measure Water-Use Efficiency without using carbon isotope fractionation?

I read "Measurements of delta (C-13) in C3 species may usefully contribute to the selection for transpiration efficiency." I think the device to measure carbon isotope fractionation is very expensive. ...
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What is a good approximate functional form for an equation relating plant growth to sunlight?

Question is in the title. I've got daily measurements of daily mean shortwave radiation at the surface, and annual measurements of plant growth (some measure, be it height or biomass or something). ...
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22 views

Nitrogen and Plant Elongation

Simple explanations of phytohormones posits that apical meristems synthesize auxins which stimulate root growth and that root tips synthesize cytokinins. Cytokinins express nitrogen availability and ...
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Fruit-producing water plant

Are there any water plants that grow fruit that is meant to be eaten? I’m specifically interested in plants that are not rooted permanently to the earth but are mobile for at least part of their life ...
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Can plants yield two more molecules of ATP from glycolysis?

Since 2 ATP are used to convert glucose to glyceraldehyde 3-phosphate in glycolysis, can plants bypass this step of ATP investment since they produce glyceraldehyde 3-phosphate directly from the ...
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Why are C4 plants mainly tropical plants?

Why is it that most C4 plants are tropical plants? As far as I am aware the C4 cycle does not prevent water loss; so having it exist in tropical areas does not serve these plants any good other than ...