Study of the normal functioning of plants and plant cells

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Sprouted hulless barley producing acetic acid after several days in the fridge

After soaking of naked barley for 1 day, the barly did sprout in a room-temperature environment for 3 days. After having repeated this process for several times, one can say for sure that in a ...
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22 views

How can I estimate the CO₂ uptake of a plant?

I would like to make an estimation of the CO2 uptake of plants I cultivate, including, lettuce and aromatic herbs, such as thyme, basil, rosemary. What I want is to end up with a rough indicator for ...
3
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1answer
92 views

Why does Citric Acid occur in Citrus fruits?

Why is there so much citric acid in citrus fruits? And how did it evolve i.e. what did it come from? Is it a by-product of the ripening process? Why have citrus fruit evolved a particularly high ...
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1answer
34 views

Reason for aquatic plant roots

My question is about why aquatic plants have roots. At first they seem a bit superfluous to me because leaves of the plants could just absorb nutrients directly from the water thereby skipping a need ...
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64 views

How do CAM plants keep stomata closed by day and open at night?

I understand how plants open stomata, with the H+ ion removal and the resulting K+ ion influx in the guard cells to induce turgor (wikipedia article here), though not how this process relates to ...
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215 views

How many ATP are formed?

What is the number of ATP molecules formed during the photosynthetic processes which consume 8 molecules of $\text{H}_2\text{O}$ due to noncyclic electron transport and subsequent ...
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25 views

Do plants need vitamins to grow?

I've found that some commercial off-the-shelf liquid nutrient mixtures are advertised: contains vitamins your plant needs to grow. And I started to ask myself, do plants really need vitamins to ...
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1answer
35 views

Determine which seed will germinate first

I recently studied about plant physiology for a test. Strangely, there was this question which I had no idea how to approach. The question is, Which seed will germinate first? a) Castor b) Wheat ...
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1answer
45 views

Is there a model perennial plant species?

Most of plant science is conducted on small annual species with short life cycles; predominantly Arabidopsis thaliana, but also a handful of others like Oryza sativa and Medicago truncatula etc. Is ...
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67 views

Why do we need to put phosphate fertilizers along with rhizobium?

Isn't phosphorous a macro nutrient? So it should be present in the soil in sufficient quantities... but still we add phosphate. Why?
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37 views

Why Isn't mineral transport in xylem multi-directional?

According to our textbook, Xylem transport is only unidirectional while transport through phloem is multi-directional. But minerals are taken up by xylem from the surrounding tissues actively, and ...
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1answer
85 views

Why would the citrulline content of the watermelon be so high?

Citrulline is a non-proteinogenic amino acid (that is, citrulline is an amino acid that is not coded for in mRNA), and it is an important metabolic intermediate in the Urea Cycle. The Urea Cycle is ...
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16 views

Extraction of RNA from algae

I have used a standard protocol (I will give the bibliography below) to extract RNA from an algae (Posidonia) but I have get literally nothing, since I could not even see traces of the two rRNA. I ...
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9 views

Why guard cells need to turn malate into postassium malate to become turgid?

According to the Active Potassium Transport Ion concept given by Levitt et.al, stomata open due to turgidity in guard cells. It seems that guard cells turn the starch produced by photosynthesis into ...
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1answer
24 views

How fast do stomata respond to environmental changes?

How fast does stomatal resistance respond to environmental changes? Correct me if I'm wrong, but I assume that atmospheric humidity would be the fastest changing factor (e.g. rain storm on a dry day, ...
8
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1answer
76 views

How fast is water transported from roots to leaves?

I understand basically how water transport from roots to leaves through the xylem works, but I have no idea of the timescales involved. How long does it take for water to get from root tips to ...
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33 views

Is there a plant particularly suitable for absorbing Hydrogen Sulfide

I live in an area with some open sewers and in the morning I can usually can smell the gas inside my house. There are many plants like snake plant which improve indoor air quality but I was ...
3
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1answer
62 views

Do lunar rhythms have really impact on plant growth?

It is commonly known that lunar rhythms have influence on plant growth, and there are even lunar calendars to know when planting, pruning, transplanting, harvesting, etc. I know that the lunar cycles ...
3
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1answer
64 views

Needle-like crystals observed in wild-grape wine under microscope. Potentially harmful?

I recently crushed and strained about thirty pounds of wild grapes to ferment into wine. About a month in, I did a visual inspection of the wine under microscope to try and identify some yeast and ...
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1answer
90 views

Is there an evolutionary advantage for coconut oils to be rich in saturated fats?

I know that coconut oil is composed of multiple saturated fatty acids, but is there a reason why this would have increased the fitness of the coconut plant?
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1answer
108 views

Can electricity be harvested from the soil around plants? [closed]

This is a rehash of a question I originally wrote on Skeptics which got moved to Physics, but I'm really after an answer from a biological perspective. A device called the E-Kaia is making news by ...
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1answer
74 views

What do the numbers in Photosystem I P700 and Photosystem II P680 stand for? Is it the optimum wavelenght? The maximum wavelenght?

I am a bit confused about this because my teacher and english Wikipedia say it's the wavelenght the Photosystem is most reactive to; my textbook and the german Wikipedia say that it is the maximum ...
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1answer
57 views

Folding of bulliform cells

How do bulliform cells cause a leaf to fold in half when the leaf looses water? Also, how would these bulliform cells be arranged to cause the cell to instead curl up?
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14 views

Available soil water to plants

Textbooks say that when the water content of soil is greater than its field capacity, the water is not available to plants. Why? I know some plants can utilize water even from saturated soil, but for ...
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1answer
369 views

Why are many fruits sour?

Many fruits (like apples, berries, citrus fruits etc.) contain high levels of organic acids, especially malic acid and citric acid. Are there any evolutionary functions of those acids in ripe fruits? ...
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60 views

How does a garlic clove thrive inside a closed refrigerator?

A garlic clove has been growing very well inside a closed refrigerator. It has developed beautiful green stalks, which I think are the equivalent of leafs. Since they are green, I assume they ...
5
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1answer
92 views

What could cause spiral tree growth?

While hiking through one of the areas burned in the 1988 Yellowstone fires, I noticed that some of the trees appeared to have grown in spiral patterns. Most downed trees have crack patterns that ...
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1answer
79 views

Why would a venus fly traps mouth that's still “chewing” die?

A venus fly trap produces leaves that act like traps for insects. A trapped insect is digested over several days. The trap then opens again to catch another insect. These traps regularly die off. ...
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21 views

what is the effect of temperature and carbondioxide on the opening and closing of stomata?

I am teaching biology in an academy. The question which I had asked above had been raised by on of my students. I tried my level best to search out the answer to this question but I could not find the ...
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2answers
262 views

How do plants get carbon?

How do plants get carbon? From air or soil? How is it different for aquatic plants and algae? According to https://en.wikipedia.org/wiki/Soil_organic_matter soil has 3.3 times the size of the ...
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11 views

Nicotine and plants [duplicate]

I hear that nicotine, produced by Nicotiana tabacum, is poisonous to the plant itself, which is why it accumulates the nicotine in the central cell vacuole. If so, why is nicotine produced in the ...
0
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1answer
143 views

Can plants feel pain? [closed]

I was wondering whether plants could feel pain, for example, does grass feel pain when you mow the lawn? Or do the plants and trees that grow vegetables and fruits feel pain when you harvest them? ...
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1answer
34 views

RNAi in nematode resistant plants

Background : Certain plants have been genetically engineered to have sense-antisense gene of a parasitic nematode. The dsRNA produced by the plant then inactivates the mRNA produced in the nematode, ...
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1answer
42 views

Do herbaceous plants have woody parts? [closed]

Do herbaceous plants, especially perennial plants have woody parts, like woody stem?
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16 views

Do epidermal differentiated cells release cutin, like guard cells?

Cutin is released by epidermal cells. Do epidermal differentiated cells like guard cells or trichomes or root hairs also release cutin? Many thanks.
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1answer
115 views

Can roots have cuticle, especially aerial roots?

In my school biology book, it is written that cuticle covers the epidermal cells in aerial parts of plants and root epidermis doesn't have cuticle. My question is that whether aerial roots, in plants ...
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40 views

How to measure the biomass of hydroponic plants in netpot/rockwool DWC system?

I'm doing an experiment with 4 kale plants, each in their own small deep water culture (DWC) system. Each plant was transplanted in rockwool with netpots and clay pebbles. But I need to periodically ...
32
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1answer
3k views

What is it that creates that wonderful smell after a fresh rain?

I've heard that the wonderful smell of a fresh rain is actually chemicals released from the trees and grass and other plants. What is the process that allows these chemicals to be released? What ...
4
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1answer
27 views

Accuracy of best plant growth models?

Given a plant $P$, predict its height $H$ at time $t$ since planting given some environmental variables $E_1, \dots, E_n$. How accurate are the state-of-the-art models for such thing? What data is ...
3
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1answer
62 views

Where is ATP used in Phosphorylation?

In the section describing the Calvin Cycle, under the subheading "Reduction", my textbook states that: The steps involve utilisation of 2 molecules of ATP for Phosphorylation... I could not get ...
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2answers
149 views

Can carnivores survive on a (processed) vegetarian diet? Why or why not?

There are many differences in for example the digestive system between carnivores, herbivores and omnivores. It seems that in certain kinds of species adaptability with respect to diet is possible. ...
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141 views

Can plants live forever? [duplicate]

I know that some plants die for old age like a lettuce. But there are trees like Baobabs or larger Ficus in the tropics of whom we don't know their age. And trees like spruce reaching 9950 years old, ...
6
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1answer
96 views

Viruses selected by evolution

First let me apologize in advance for I know almost nothing about biology. I had a conversation today with a family member who is a bio-computer-scientist and he talked to me about what his colleagues ...
4
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1answer
1k views

Which are mobile and immobile elements in plants?

I am confused with this element or nutrient classification in the plants, since some authors set elements like $\ce{S}$ and $\ce{Ni}$ as mobile and other as immobile elements (Citation 1, 2, 3, 4, 5). ...
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2answers
220 views

How do roots obtain nutrition?

I have a city garden (see picture below) and yesterday I was nurturing it and I pulled up a small plant. I saw its root system and laid it in the sun to dry a bit and then scraped of the rest of the ...
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32 views

Book-recommendation: plant biophysics [closed]

I'm a physicist by training am looking to learn more about the biophysics of plants. Can you give me your recommendation of good resources on plant biophysics? Books are preferred.
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42 views

Solidification of coconut water

At first, the coconut is filled with liquid endosperm. Later when it ripens, the outer layers form brown fibrous covering, and the inner solid layer turns brown and hardens. Within that, a white layer ...
5
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1answer
77 views

How does CO₂ concentration affect photosynthesis?

I have heard the theory that with the increase of CO2 in the air, the speed of the photosynthesis would increase, thereby limiting the increase of CO2 levels. What is currently the rate limiting ...
3
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1answer
919 views

Why are there more stomatal openings on the lower surface of a dicot leaf?

This causes more transpiration to occur from lower leaf surface. What's the exact reason for why are there more stomatal openings on the lower surface of a dicot leaf?
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2answers
63 views

Determining how much energy a plant takes in?

I asked a question on WorldBuilding.SE, "Are diamond berries possible?". This led to asking a question on Chemistry.SE about the amount of energy required to burn a 1 ct. diamond (−6.527kJ). The ...