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Questions tagged [plant-physiology]

Study of the normal functioning of plants and plant cells

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6
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2answers
1k views

Why do humans transport glucose but not sucrose like plants?

The reason why plants transport sucrose rather than glucose is due to the fact that it is more efficient and that nearby cells would not take up all the glucose too quickly. Hence the plant convert ...
4
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1answer
805 views

What is the purpose of DMT in plants?

N,N-Dimethyltryptamine (DMT) is found, besides humans and other animals, in many plants(50+). In humans (in the pineal gland) it is suggested that it is used for our immune system. ...
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1answer
2k views

How to correctly preserve organic matter with ethylene and polyethylene glycol?

I am trying to preserve and dye flowers, especially roses. Let me walk you through the process I am trying to optimize: 1) Soaking flowers in 96%-ethanol for a day to dehydrate them. This step ...
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3answers
5k views

Blue light in a fridge. Is it really beneficial or just marketing?

Recently while visiting a shop with electronics I saw a fridge with a huge advertisment sticker going more or less like this: There's blue light source in this fridge so there will be less bacteria ...
0
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1answer
713 views

Genotype result of double fertilization

So, clearly, the endosperm would be a fusion of the polar nuclei and one male gamete. Does this mean that each male gamete would have a T allele on it? I can't seem to figure out a way to predict ...
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0answers
17 views

Which factors dictate the mineral composition in plants\vegetables?

Here's a table of vegetables mineral composition (one of many), just as an example. Each vegetable contains different amounts of minerals, and my question is why is that, or in other words: Which ...
3
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1answer
460 views

What can we infer from Warburg's Flashing Light experiment?

The 'Dark Phase' in photosynthesis as I know is not dependent on darkness, but is just 'Light Independent'. But the Warburg Flashing light experiment, makes me think again. Warburg obtained higher ...
0
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2answers
45 views

How can rhodobacter possess a single 'PS-II' like reaction center?

I recently came across an information in my book Trueman's Elementary Biology , a popular text in India, that photosynthetic bacteria like Rhodobacter, Rhodopseudomonas etc. possess a single ...
2
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1answer
75 views

Do plants sleep under ultaviolent rays? [closed]

I observed Phyllanthus reticulatus is sleeping during nights. I want to plant this species indoor under a UV device. Do these plants sleep under ultraviolent rays? (Sleeping means leaves are close ...
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0answers
1k views

How many oxygen atoms are used up in aerobic oxidation of one pyruvate? [closed]

Please explain elaborately, if possible using the EMP, Krebs and ETS cycles.
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2answers
5k views

Why do animals use glycogen for their polysaccharide storage whereas plants use starch?

The polysaccharide storage form of glucose in animals is glycogen, whereas in plants it is starch. Both of these are polymers of α-glucose with α-l,4 glycosidic linkages and α-l,6 glycosidic branch ...
5
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1answer
1k views

Where do all the NAD+s come from?

In the mitochondrial respiration (of plant cells) NADH is reduced from Nad+ as part of the TCA (converting malate to oxaleoacetate). But where do the NAD+s come from? The TCA cycle is working even ...
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1answer
230 views

Do plants use only solar energy or can they get energy from other forms of light? [closed]

Plants use energy from sun. Is it just sun's light energy or any form of light (like light from a tube light) can excite electrons and initiate photosynthesis. This actually sounds a bit idiotic but ...
3
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1answer
2k views

Negative Phototropism In Plants

Why does the root of a plant go away from the sun? The shoot goes towards the sun, why does the root go away from it?
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0answers
82 views

What is the role of Cl-, H+ and Malic Acid in stomatal opening and closing?

I understand that K+ influx brings in water making the guard cell turgid. This opens stomata. What is the role of other molecules/ions in this?
3
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0answers
107 views

Can photorespiration do any good?

When CO2-levels are to low plants start to photorespirate instead of photosynthesise. This cost them losses in energy, and adds CO2 to the atmosphere instead of O2. I wonder if the photorespiration ...
0
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1answer
272 views

The source of ABA for inducing stomatal closure in the detached leaves?

As you may know, when leaves detached from the whole plant close their stomata to maintain water and prevent wilting. Could you please let me know what is the mechanism of stomatal closure in the ...
3
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1answer
3k views

Difference between Trophic and Tactic movements

What is the difference between Trophic (eg. Chemotrophic) and Tactic (eg. Chemotactic) movements? In Bryophytes, Anthrezoids are attracted towards Archegonia. This is Chemotactic movement. In ...
1
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1answer
26 views

What are some online databases that I can search to find the pathways for sythesis of Lignin, Cellulose, GAX?

I am trying to obtain the pathway information for synthesis of Lignin,GAX and Cellulose in Sorghum. I am quite new to biology and genetics (EE background). I would appreciate it if y'all can provide ...
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0answers
87 views

How exactly does a plant know where water and light are?

I actually researched on this, but nothing was found regarding this. The only thing I found is that auxins grow on the farthest side causing it to elongate. Yes, but how exactly do the plants know ...
5
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1answer
145 views

Is it normal for corn to have multiple ears in one place?

I have (out of a mistake) one corn plant in my greenhouse and it made 4 cobs in one place. Is that normal?! I never saw something like this before.
3
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0answers
160 views

How did fig tree take root in trunk of palm tree?

Please see pictures below. I never saw anything like this. Do the roots of the fig tree penetrate the trunk of the palm tree? Is there a symbiotic relationship between the two?
5
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1answer
2k views

Why will happen if plant phloem does not contain sieve plates?

What are the primary functions of the sieve plates that make them so crucial? I've done a bit of reading online and found "Sieve plates are perforated end walls separating the component cells (sieve ...
1
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1answer
129 views

In plants why are potassium and nitrate ions absorbed faster than any others?

Quoting my A-level biology textbook: $\ce{K^+, NO3^-}$ are absorbed by plants faster than any other ions. Whereas, $\ce{Ca^2+, SO4^2-}$ are absorbed with the slowest speed. What is the reason? ...
3
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1answer
93 views

Reasons for a flower type to consume water faster than another?

This is an easy experiment where you put a white flower into a recipient filled with water and liquid watercolor, so that the flower gets dyed. While doing this experiment for different types of ...
0
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1answer
217 views

When does a jalapeño begin to produce heat/capsaicin?

I have a small Jalapeno plant in my apartment. About two weeks ago, it started producing a few flowers. In the last few days, many of them have started to turn into fruit; however, a few of the ...
0
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1answer
182 views

Did I understand the definition of “gross primary production” correctly?

According to wikipedia Gross primary production (GPP) is the amount of chemical energy as biomass that primary producers create in a given amount of time. So if a plant creates 6g of biomass in 1 ...
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2answers
1k views

Is “reaction center” the same as “photosystem”?

I have a diagram which labelled a part of PSI (Photosystem I) as "reaction center". But I have read on several websites that the reaction centers are PSI (the whole complex, not just a part of it) and ...
1
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1answer
80 views

Relation between carbon dioxide assimilation and the ambient and intercellular partial pressures of carbon dioxide

So, water-use efficiency (and carbon assimilation rate) is correlated with ambient CO₂ concentration (Ca), and carbon isotope discrimination Δ is correlated with Pi/Pa (partial CO₂ pressure, ...
3
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1answer
473 views

How can tree branches grow upwards against gravity?

I saw this tree in front of my room with those branches, and I asked myself why they didn’t grow downward in the direction of gravity since that would be easy for them? And I came to the conclusion ...
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0answers
48 views

What type of nutrients can be applied foliarly?

I am interested in what type of nutrients can you spray on plants? Which ones do get used by a plant and which ones make no difference. By nutrients I mean general fertilisers N,P,K and also micro ...
2
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1answer
671 views

How does blue, yellow and orange coloured light affect photosynthesis? [closed]

I've been conducting an experiment with different colored light and photosynthesis, and so far my hypothesis states that red light will grow the plant, green will slow or kill it, and white will grow ...
0
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1answer
38 views

Watering plants with soaked forest soil [closed]

I am thinking of mixing forest soil with water and water plants with that. I was hoping that nutrients from soil would get released into the water, so in effect, fertilize the soil. I am not sure if ...
0
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1answer
55 views

Is it feasible to grow edible crops for lawns?

Is it possible to grow some type of plant that functions well as a lawn (e.g. is somewhat grass like), but that is humanly edible? Would anything that currently exists fit this role? For example ...
2
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1answer
3k views

Share of water usage by plants

From the total water absorbed by the root system, how much water does the plant use for transpiration and how much water does the plant use for photosynthesis?
3
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1answer
424 views

What types of plants are Gibberellin used on?

On what type of plant (monocot/ eudicot? family? species?) is Gibberellin used on? I searched through many sources but could not find whether Gibberellin works for all plants or just a specific type ...
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0answers
369 views

What determines when plants grow?

I am interested in dryland ecosystems, and I am trying to find material on what determines the time at which plants in dryland ecosystems, either shrubs or grasses, grow and shoot? Is it only related ...
4
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2answers
691 views

Books for learning how plants function

Can you recommend a good, detailed book on how plants function? A book that explains plant processes on a molecular level from roots up to the fruit. I am interested in home crops production, such as ...
5
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1answer
196 views

How do plants store energy by potassium battery?

Plants have a so-called potassium battery system for energy storage/conversation. Wikipedia only has a reference to a technical article. Can someone explain it in a layman's language (or refer to a ...
4
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1answer
234 views

Photosynthesis and thermosynthesis(?) in plants/organism [closed]

A while back I thought to myself: if plants could absorb the entire(or most of) light spectrum as opposed to a narrow range, would it be better/absorb more energy/etc. Recently i read that was not the ...
8
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3answers
8k views

Photosystem 1 and 2; P680/P700; Chlorophyll a/b

I am getting slightly confused about how the above relate to each other. My current understanding is that P680 and P700 refer to the primary pigment reaction centres in Photosystems 2 and 1 ...
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0answers
138 views

Why are synthetic Auxins capable of killing dicots such as weeds at high concentration but do not cause damage to monocots?

I read that synthetic auxins like 2,4-D and 2,4,5-T can be used as herbicides against dicots but they don't affect monocots. Can someone explain how they damage dicots and not damage monocots
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0answers
147 views

Where does oxygen come from in winters? [closed]

Since plants shed their leaves and don't perform photosynthesis during winters, where does oxygen come from?
2
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1answer
869 views

How do plants maintain air spaces in leaves?

As we know, there are air spaces in the mesophyll layer which allows carbon dioxide to diffuse in and oxygen to diffuse out, but cell membranes are partially permeable and allow water to diffuse to ...
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1answer
4k views

Could plants do photosynthesis at moonlight?

Related to this and this but not exactly same; could plants do photosynthesis at moonlight or more dim-intensity light?
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1answer
673 views

Are two colors (red + blue) necessary for LED grow lights, or would either color be sufficient?

Below are some chlorophyll absorption spectra from other answers here. There is strong absorption at both the blue/violet end, and the red end of the spectrum, and presumably both of these contribute ...
14
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1answer
11k views

Can plants produce oxygen at night (without light)?

I accidentally clicked on a "Top n X's that Y" result in google and found Top 9 Plants that ...
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1answer
1k views

What happens when you take a deciduous tree and place it in a climate controlled greenhouse?

The greenhouse would have stable level of light, (matched with day/night wavelength brightness changes like outside the greenhouse), humidity and temperature. Do certain processes in the tree not ...
5
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1answer
15k views

Complete list of touch sensitive plants

I am not sure whether the word "touch sensitive" is precise enough. What I am looking for is a list of plants that respond to touch noticably like Mimosa Pudica. I only know of Mimosa Pudica example. ...
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0answers
41 views

Enhanced Spectrum Chloroplasts

As far as I'm aware, chloroplasts produce energy through the use of photosynthesis which essentiall converts CO2 and Water into Glucose (I'm an engineer by trade so really wracking my brains to the ...