The study of plant life; e.g. angiosperms, gymnosperms, bryophytes, pteridophytes, and algae.

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44 views

How can a haploid plant be bisexual?

According to Wikipedia: Meiosis is a specialized type of cell division that reduces the chromosome number by half. This process occurs in all sexually reproducing single-celled and multicellular ...
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1answer
52 views

Why all trees have cylindrical stems?

Why a huge number of trees/plants have cylindrical stems? I have been told that this question's answer lies in Physics but I don't know where to find. Can any one help?
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16 views

Have there been any studies on 'surf balls'? (not related to surfing)

I know the title sounds like something else, but I'm actually wondering about these things, which are also apparently called 'whale burps': This one was found on a beach on Lake Michigan. Does ...
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1answer
77 views

I need help identifying a completely unknown plant for my biology class

I know two things about this plant 1 is that it does not need to be watered for a long time because it has been able to survive in my schools greenhouse for quite some time without water and 2 my ...
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0answers
19 views

Do any plants grow leaves beneath the ground?

We have a pretty common California weed in our yard. When we dig in the ground, we often find small ones there, with green leaves! It's as if they form green leaves before they come to the surface. ...
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69 views

Behavior of plant guard cells: open or closed stomata

On an exam of mine, I had the following question: The interaction between the guard cells and stomata in a plant leaf can be seen in the diagram below. In which scenario could the guard ...
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1answer
104 views

Help Identifying Tree

I live in the upper southeastern region of Arizona in U.S. There's a type of tree growing in my back yard that I can't seem to identify. Its growing in an arrangement very similar to an ocotillo ...
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1answer
143 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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2k views

Difference between thylakoids and lamellae in a chloroplast?

I'm slightly confused as to the difference between thylakoids and lamellae. My understanding was that thylakoids are 'discs' that are stacked into grana and there is a membrane between the grana ...
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1k views

Do immature fruits perform photosynthesis?

Most immature fruits are green: peppers, pine cones, plums, lots of them. I want to know if the green is from chlorophyll in the cells. Do the fruit cells perform photosynthesis? When you cover a ...
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1answer
1k views

If oxygen is such a good energy source, why do plants release it?

Why do plants release excess oxygen, rather than consuming it entirely given it is an excellent energy source?
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4answers
7k views

Why would a plant evolve to produce an addictive chemical?

It seems kind of anti-productive in terms of survival for a plant to produce an addictive chemical as that plant will constantly be sought after by animals that ingest it. In this instance, I'm ...
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2answers
55 views

Current scientific theories for evolution of Cucurbita

I'm attempting to find research on scientific theories surrounding the evolution of certain plants, and am unable to find any footing with respect to a certain genus. In this case, I am researching ...
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2answers
131 views

What happens if we continuously stimulate a mimosa plant?

I know there is some mechanism in humans by which we start to ignore a certain stimuli if it persists for a long time (e.g., we don't feel our shoes all the time !). Can the same thing happen in ...
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1answer
620 views

What kind of fruit is this?

Just spotted this fruit while walking to school. It's the size of a small coin.The taste is almost sour and tangy and somewhat sweet (I only tried one of them and very little of it). I admit, ...
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0answers
25 views

How quickly does plant cells regenerate? [closed]

This is a question from my Biology class homework? I've looked online, but I can't find the answer.
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0answers
27 views

Why does my corn appear to have perfect flowers?

Corn is said to be a synchronously monoecious plant with separate male and female flowers. I am growing a cross between a Peruvian and heirloom variety which seems to be growing some perfect flowers ...
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1answer
142 views

Why aren't plants' roots as diverse as leaves?

I have been doing some gardening recently and I suddenly realised that all plants have superficially identical non-woody roots of the same size from gigantic trees to small fruiting plants and ...
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0answers
21 views

Can humans extract calories from all roots? [closed]

Roots are used for storing plants' energy, which suggests that humans could extract the calories by consuming them. However, I have been unable to find any substantial sources on consuming the roots ...
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0answers
20 views

Why do shed and brown poplar (Populus) leaves get an iridescent blueish colour when wet?

When the brown leaves of poplars shed on the ground stay for a while under wet conditions (e.g. like in a puddle), they become a fascinating iridescent blueish colour, which is best seen when light ...
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1answer
34 views

Creation of healthy genetically modified crops [closed]

GM crops are huge at the moment, and the noticeable 'counter movement' is for people to continue to purchase organic foods (please note I am specifically talking of GM crops and not meats, etc). The ...
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1answer
268 views

Is chlorophyll living or non living?

Is chlorophyll living or non living, and after boiling the water out of a chlorophyll extract would it still live, as in would it still maintain its properties after re-adding liquid to the dried ...
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1answer
84 views

What is the purpose of THC for a Cannabis plant?

Why does a Cannabis plant produce THC? This question is brought up drawing an analogy to nicotine in tobacco, where nicotine is developed by tobacco plants as a pesticide. Is THC a pesticide as well? ...
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1answer
60 views

Possible calculations with temperature, humidity, images and VIS spectrum of a plant in an Integrating sphere

I am currently working on a project which involves growing some plants in a integrating sphere made of foam. I have added temperature, humidity and soil moisture sensors as well as a Spectrometer (350 ...
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3answers
321 views

Doubly-compound leaf examples?

I've got a project where we collect leaves, classify them, etc. There are some required classifications. One of the requirements is to get a doubly-compound leaf. What are some trees that are ...
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1answer
374 views

What is the difference between taxonomical aids Flora, Manual and Catalogue?

The three type of books mentioned above are taxonomical aids that offer information about species found in an area. However, the exact difference between them is not clear to me. Please explain.
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386 views

Are these birch or aspen trees?

I was just wondering if anybody could help me identify the trees in this image? I am confused as to whether they are aspen or birch, a mix of the two, or whether the brown/reddish trees are some other ...
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2answers
52 views

Are chilies technically peppers?

Nando's chain of restaurants (UK) refers to chili peppers as just "chilies". My friend and I had a discussion with regard to whether chilies can be called "peppers" or if they do not belong to the ...
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19 views

How does the snail shells' fertilizer compare to regular fertilizers?

May I ask about the quality of the fertilizer derived from the shells and their effectiveness compared to other fertilizers on the market ?
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2answers
94 views

What plant is this?

It was all along a fence in a downtown core in Ottawa, flowering in November. I didn't get a better close-up of the flower itself, I had thought the leaves would be pretty important.
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21 views

Relation b/w venation and transpiration

What purpose does reticulate venation in dorsiventral leaf or parallel venation in isobilateral leaf serve? Does it have any relation with unequal transpiration in dorsiventral leaf or equal ...
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2answers
655 views

Why are there so many medicinal plants?

Question Quite a few plant species can be used for medicinal purposes wiki. As an example, Filipendula ulmaria is rich in acetylsalicylic acid (aspirin). An allele that produces a substance which is ...
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0answers
28 views

What are the evolutionary benefits for herbs having beneficial health effects on humans? [duplicate]

There are many types of plants which produce chemicals which can be beneficial in treating human illnesses, or at least alleviate painful symptoms. Why would they do that? Is it just random chance, ...
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0answers
39 views

What is this plant/tree? [closed]

I'm trying to identify a plant or tree.Small round Orange to yellow petals with a protruding red stamin. Found in the Florida keys. Sub tropic.
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1answer
87 views

Is Asteraceae and Compositae the same family?

I'm wondering what taxonomic family sunflowers (Helianthus) belong to. Although it's mentioned it belongs to family Asteraceae it is also a composite flower. So it belongs to Asteraceae or Compositae ...
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1answer
92 views

Why it seems that principles of chemistry are not being applied in this biochemical process? [closed]

According to an answer in this question, my concept used below does not apply: In the non-cyclic photophosphorylation, consider splitting of two water molecules, then 4 e- (electrons) and 4 H+ ...
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0answers
18 views

Are there water conservation methods that increase waste instead of reduce it? [closed]

For example, does improperly washing clothes lead to mosquito increases or other-organism morbidity? Does using dish water on the garden attribute to clean water more or more wasted water (is it ...
6
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1answer
4k views

How does a pine cone open?

When a pine cone is wet, it remains closed. However, when it's dry it opens again. From the perspective of physics or biomechanics, what is the mechanism that allows a pine cone to open and close as ...
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2answers
276 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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0answers
23 views

Database/Reference on optimal conditions for plant growth in greenhouses [closed]

We are a group of computer science students currently working on a university project to create a (almost) self-sufficient greenhouse. The hardware and software aspects being almost finished, we ...
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1answer
18 views

Anemiaceae etymology

What is the etymology of the name Anemiaceae for a family of ferns? I assume that it's from the name Anemia for one of its genera, but that is equally mysterious. Obviously it has no blood, but what ...
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0answers
14 views

In what sense does lichen 'eat around itself'?

Source: pp 31-32, Lichen Secondary Metabolites: Bioactive Properties and Pharmaceutical Potential, edited by Branislav Ranković Lichens are used for many different medicinal purposes, but there ...
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0answers
39 views

Does the bending of a tree's trunk in the wind stimulate and strengthen root growth?

Recently Southern California experienced extreme wind velocities and afterwards the news reported over 300 trees had fallen in San Diego County. I had either heard or read somewhere that the action of ...
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2answers
90 views

Why do pine stands exist?

I live in the midwestern United States. I cycle to work, sometimes on heavily wooded roads, and I can't help but notice that in most places within the surrounding deciduous forests Pine and evergreen ...
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4answers
6k views

Do plants with non-green leaves have chlorophyll and photosynthesis?

Is it even possible that plants with non-green leaves have chlorophyll, and do such non-green leaved plants carry out photosynthesis?
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2answers
71 views

Etymology of the term monilophyte

I would like to know the origin of the term Monilophyta. I know it's from Kenrick and Crane, but where did they get monilo-? It's not in my enormous Liddell and Scott Greek dictionary, nor is there ...
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29 views

Is there a special reason why ferns are so early in evolution?

Reading about plants in history it seems that ferns where already in the Devonian period (400 million years ago) growing. Probably the climate in that time was very different from now, but what made ...
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0answers
20 views

How to stimulate Mimosa pudica at its roots?

The sensitive plant Mimosa pudica is a remarkable little plant whose characteristic feature is its ability to droop its leaves when stimulated: For a new studies project, could anyone think of a ...
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2answers
248 views

What is Growing on These Tree Leaves? (Image)

I found a seemingly diseased tree when I was out playing tennis yesterday... What is growing on this tree leaf? Is this a disease? If so, is it contagious? I have zero knowledge in botany, but I'm ...
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133 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 ...