Hot answers tagged

65

No, that is a New Zealand pohutukawa (Metrosideros excels) and it blooms for Christmas, not Easter. Sources: https://en.wikipedia.org/wiki/Metrosideros_excelsa http://www.doc.govt.nz/nature/native-plants/pohutukawa/


53

The 'cactus absorb radiation' meme is very widespread, but seems very short on detailed analysis. So let's start with some basic facts. None of the articles are explicit about what radiation they are talking about. However the only significant radiation emitted by computer monitors is electromagnetic radiation, which is all around us all the time, and in ...


48

No. This flower is the flower of the Metrosideros excelsa, the tree is also called pōhutukawa tree and New Zealand Christmas tree. According to its wikipedia page the tree: The tree flowers from November to January with a peak in mid to late December (the Southern Hemisphere summer), with brilliant crimson flowers covering the tree, hence the nickname ...


40

No, Aloe Vera doesn't help prevent or heal sunburn. I have to admit to being surprised by this. I was expecting to see a (small) effect. Porntip Puvabanditsin and Rujirat Vongtongsri, Efficacy of Aloe Vera Cream in Prevention and Treatment of Sunburn and Suntan J Med Assoc Thai 2005; 88(Suppl 4): S173-6. This experiment involved 20 volunteers in a ...


33

You are correct that the effect on oxygen levels are not significant. There is a much greater impact is on CO2 levels. Still, with respect to the effect on indoor air quality, the most important influence of plants is the removal of a class of pollutants known as volatile organic compounds (a.k.a. 'fumes') that include formaldehyde (Kim et al, 2010, Tarran ...


23

To repeat Oddthinking's answer, that is a simple NO. The mustard seed is far from the smallest. That distinction belongs to the Orchid. With over 26,000 species, many having seeds no larger than grains of dust from 0.4mm to 0.2mm in size. This document (PDF) actually gives a pretty full accounting of Orchid seeds.


19

According to the US Department of Agriculture, Forest Service publication THE EFFECTS OF URBAN TREES ON AIR QUALITY Trees remove gaseous air pollution primarily by uptake via leaf stomata, though some gases are removed by the plant surface. Once inside the leaf, gases diffuse into intercellular spaces and may be absorbed by water films to form acids ...


18

No. Several sources put mustard seeds as between 1 and 2 or 3 mm in diameter. For example: During the hulling of white mustard seeds and rapeseeds, 1.4 mm to 2.8 mm in diameter, on a disk equipped with blades [...] Meanwhile, begonia seeds, as an example, are much smaller: Species description Begonia fangii [...] Seeds many, brown, ellipsoid, 0.5-...


17

There are two pathways in photosynthesis. Light reactions where O2 is released by splitting H2O. Dark reaction (Calvin Cycle) where CO2 is used to make sugars The energy to drive these reactions come from sunlight. CO2 is absorbed via stomata, and O2 is released by the same stomata. In CAM photosynthesis, or Crassulacean-Acid metabolism, the plant ...


17

The Dracaena cinnabari (Socotra dragon tree or dragon blood tree) is well known for having a distinct red sap or resin and there are a number of other plants that also exhibit similar "Dragons's Blood". As noted in the Wikipedia article on Dragon's Blood: The dragon's blood known to the ancient Romans was mostly collected from D. cinnabari, and is ...


16

Gympie-Gympie is said to have the most painful sting of any plant in Australia with reference to this source. Can the pain last for years? Answer: Partly yes up to one year referring to research by Marina Hurley in 2000. The stinging sensation can be felt up to a year since human bodies cannot break down silicon. The hairs are often so small that the ...


14

Chlorine does evaporate, so if exposed to air (e.g. in a bucket) in warm water (especially under UV light or sunlight) it will probably mostly dissipate overnight. Both fluoride and chloramine will not similarly dissipate, if you want them removed you need to filter them out (e.g. with activated carbon) or distill the water. See: Can You Remove Fluoride ...


11

Not impossible, but highly unlikely The technology described does exist. Scientifically this is called Plant Microbial Fuel Cell. However Bioo's claims of 40 W/m² seem greatly exaggerated. People involved in e-Plant, a Dutch company which already has similar product on the market have published a number of scientific papers in Biotechnology for Biofuels ...


11

The UN Food and Agricultural Organisation (FAO)'s forest report State of the World’s Forests states that forests cover 4 billion hectares of the Earth's surface: Forests currently cover about 4 billion hectares, about 31 percent of the earth’s land surface (FAO, 2010b). It also provides a graph of human deforestation over the past 200 years: As can be ...


10

Let me pose another process by which the anecdotal "scorching" might occur when watering during sunlight hours that sounds plausible: Let's say the water has a significant amount of some compound (e.g. salt or some other chloride) dissolved in it and some of the water sits on the leaf under the blazing sun so evaporates in place on the leaf it leaving ...


10

Plants are oxygen neutral The question wording is a bit misleading, as – surprise – plants do not produce oxygen. They produce oxygen only as long as they are growing, binding carbon in its mass. In long term all plants are oxygen neutral, as all oxygen which is created by them is again consumed when they dissolve, burn or are eaten, as carbon ...


10

Cleve Backster's work was unreproducible by himself or others, and has been discarded as a working hypothesis. Kenneth A. Horowitz, Donald C. Lewis and Edgar L. Gasteiger, Plant "Primary Perception": Electrophysiological Unresponsiveness to Brine Shrimp Killing, Science New Series, Vol. 189, No. 4201 (Aug. 8, 1975), pp. 478-480, DOI: 10.2307/1740499 The ...


8

As mentioned in the comments, the fact that The Times published this story, with a photograph of said plant, is already compelling evidence that it happened, but of course it's possible they have been fooled. If we're not willing to take The Times nor Mr. Latimer's word as evidence, we really have no way to prove that he's telling the truth, as we haven't ...


8

Vi Hart (Wikipedia biography) has produce a three part series of videos describing this phenomenon, called Doodling in Math: Spirals, Fibonacci, and Being a Plant. It explores the nature of spirals, Fibonacci and the patterns seen in plants. The third part in the series describe how this phenomena can be explained with a simple model of growth hormone. ...


7

There was a joint Hungarian-German study on the subject led by Dr. Gábor Horváth at Eötvös University in Budapest, Hungary. A team of physicists, troubled by the lack of scientific evidence for the phenomenon, set out to test the theory that water droplets on leaves can act like mini magnifying lenses, focusing the sun's rays and leaving a leaf's surface ...


7

The show 'Monster Inside Me' actually has documentation of an older man with respitory problems who did asperate a raw pea and it did germinate and start to grow inside his lung. It was removed on the 3rd Bronchisotomy trying to get a biopsy. All germination requires is moisture, warmth and oxygen. Any seed could do this, although it would not get very ...


7

This is a well known urban legend. This letter published on Chest Journal addresses the issue Trees Don't Grow in the Lungs! - Chua and Mehta, 2009 We would like to bring to the attention of readers that trees do not grow in humans. To the best of our knowledge, there has never been a single report in the medical literature of seeds and/or plants ...


6

In this paper from 2006, it states In the present study, the existence of negative and positive feedback regulation of ethylene biosynthesis is demonstrated in banana pulp and peel tissues, respectively. So, ethylene synthesis occurs in both the fruit and peel, and if there is any in the stem, it's likely irrelevant since the majority of the ...


6

No, but one should not expect a literal interpretation of of parable. It is a good idea to use an interlinerar bible when reading translated works. A concordance or other search tool that allows you to search in multiple languages can also be useful to determine the best translation. In this particular instance, the translation you quoted above seems fairly ...


6

The Wikipedia page has since been rephrased to contain the following, more accurate, paragraph: The maize plant is often 3 m (10 ft) in height, though some natural strains can grow 13 m (43 ft). The stem is commonly composed of 20 internodes of 18 cm (7.1 in) length. A leaf, which grows from each node, is generally 9 cm (4 in) in width and 120 cm (4 ft) ...


5

How good is the evidence presented in the thesis? The thesis does not draw upon molecular phylogeny evidence. Like DNA evidence in court, DNA phylogeny is considered to be much more compelling evidence than 1000 year old witness accounts. Most scientific studies to determine when speciation occured is nowdays done by molecular analysis rather than ...


5

Head over to this web page : Fibonacci Numbers and Nature Look at the 'Leaf arrangements' sections . You can clearly see that the leave arrangements and the turn of leaves both follow Fibonacci sequence and also note the section 'Always Fibonacci? ' You will find that Nature is too unpredictable to always follow Fibonacci number.


5

Here is a great article from the University of Michigan that covers some of the topics relevant to your question. The article deals with the Net Primary Production (NPP) of CO2 in the world related to human consumption. NPP is the amount of CO2 that is "fixed" (i.e., processed) by plants through photosynthesis minus the amount of CO2 that is produced by ...


5

Yes. This meta-analysis read 147 original scientific papers about GMO crops. On average those papers found a 22% increase in crop yields and a 37% decrease in pesticide use for GMO vs non-GMO crops. The meta analysis has been quite highly cited and the citing papers I looked at, (1 2), repeat the conclusions of the meta-analysis uncritically. The meta-...


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