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

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36 views

How can a YAC be screened against a cDNA library and a cosmid library of genomic DNA to find a gene?

I am reading fw2.2: A Quantitative Trait Locus Key to the Evolution of Tomato Fruit Size (doi: 10.1126/science.289.5476.85). The authors are trying to find the gene that makes tomatoes bigger. As far ...
4
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1answer
142 views

Sexual Differentiation in Monoecious plants with unisexual flowers

In monoecious plants having unisexual flowers (eg Zea Mays, Ricinus Communis etc), there must be some mechanism as to produce two sexually distinct flowers from the same genotype. Since both the type ...
2
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1answer
79 views

What is this plant?

I really like this plant--I'm just wondering what its name is (perhaps genus+species). I think this plant grows in the tropical rainforest in Malaysia. Any suggestions? Thanks!
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1answer
52 views

Does Yerba Mate contain Beta carbolines like harman and norharman?

I know that this is true of (roasted) coffee but haven't been able to find any reliable information about mate in its smoked or steamed state. Thank you.
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2answers
52 views

Clarification on Hatch and slack pathway

The following is a minor clarification that I want to make, since it is rarely addressed directly in most of the texts I have gone through. In C₄ pathway, the chloroplasts are dimorphic, that is, ...
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2answers
73 views

Why do humans circulate monosaccharides instead of disaccharides as in plants?

Plants transport food mostly in the form of disaccharides like sucrose but humans transport them in the form of a monosaccharide - glucose. What is the reason behind this ?
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2answers
120 views

Why can we breathe only oxygen?

Plants has the capacity to take in both CO2 and oxygen, that's during day CO2 and at night oxygen. Why don't humans have such a capability?
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1answer
56 views

Botany related question: liverwort sporophyte

Is perianth part of the sporophyte or gametophyte in liverworts (Marchantiophyta)?
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1answer
343 views

what is the difference between early blight of potato and late blight of potato?

apart from different fungus causing these diseases in potato, how are Early Blight of potato and Late blight of potato different?
4
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1answer
73 views

H₂S as a source of electrons for plants

The first electron source for plants was H2S, but now most modern plants use H2O as an electron source. What is the advantage of using H2O instead of H2S?
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2answers
110 views

Can you tell the sex of a white willow when it's not flowering?

Can you tell whether a salix alba tree will produce male flowers or female flowers by looking at it, touching it or generally using your unaided senses? If not, is there any way to do that without ...
5
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1answer
115 views

Why does wood become darker when it ages?

I have lots of pieces of pine furniture which have different colours depending on how old they are. So, I just wondered why that is. I guess it has something to do with structures and chemical ...
5
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1answer
70 views

How are Raunkiær's plant life forms viewed today?

At the beginning of the 20th century, Raunkiær proposed a typology of plant life-forms based on where they bear their buds, roughly as: cryptophytes: belowground hemicryptophytes: at the surface ...
4
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1answer
62 views

How much cost would artificial pollination add to common products (fruits etc.)?

I've read about ecosystem services and their possible valuation - statements like "honeybee pollination service in the US is worth 1.6 billion dollars". Is data available on how this would affect the ...
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1answer
148 views

Scientific name for the union point of a plant stem and root

Is there a word that describes the meeting point of a plants growing stem and its root? Is this the same term for aerial roots above soil level?
1
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1answer
66 views

Terms related to megasporogenesis

Well, I am not able to understand the exact difference between megasporocyte and archesporium. Also I'm not quite able to get, how or precisely from where do these arise? Please help.
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0answers
41 views

Embryo activity during seed dormancy?

What metabolic processes does a dormant embryo in a seed carry out? The newly produced seed will not germinate, either because of a lack of favourable conditions, seed hibernation, or because of a ...
6
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1answer
510 views

Regulation in plants bearing cleistogamous and chasmogamous flowers

In most plants bearing cleistogamous flowers, chasmogamous flowers are also borne by the plants. For example, Viola, Oxalis and Commelina contain both these kinds of flowers.( I am unaware of a ...
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0answers
16 views

Artificial propagation and Asexual Reproduction [duplicate]

Am I right when I say artificial propagation techniques provide the means for plants to reproduce asexually? Also, is my understanding of asexual reproduction and artificial propagation correct: ...
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1answer
70 views

Artificial Propagation and it's relation to asexual reproduction

I know that asexual reproduction is also called vegetative reproduction. However I do not understand it's relation to artificial propagation. Is it a technique used for asexual reproduction (the ...
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1answer
40 views

Seed Germination

Is my understand of how seed germination comes to be and what it entails correct? Seed germination: As the seed matures it loses water and enters dormancy (a state in which it’s metabolic processes ...
3
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1answer
32 views

Seed Dormancy and Seed Transportation

My textbook says "As the seed matures it loses water and enter dormancy". I am confused as to whether this happens before the seeds are transported or after, and as to how seeds know to become dormant ...
3
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1answer
376 views

When happens when pollen grains land on the a part other than the stigma of a flower of the same species?

When happens when pollen grains land on the a part other than the stigma of a flower of the same species? Would the pollen be transported to the stigma or would it just sit where it landed and nothing ...
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2answers
442 views

What does dominant generation mean

In my texbook it is written that for non- vascular seedless plants the dominant generation is the gametophyte as the gametophyte generation is larger and longer lived. Is the criteria for dominant ...
3
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1answer
187 views

Sporophyte and gametophyte

My textbook says that in both groups of seedless plants (vascular plants, non-vascular plants) the gametophyte is a free-living plant, independent of the sporophyte. I don't understand this statement ...
2
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1answer
84 views

Is light required for seed germination?

Is light required for germination of every seed? If not, why don't some plants require it? Is there any difference in the quality and duration of light required ? It would be interesting if someone ...
2
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1answer
27 views

Does amylolysis occur in vegetables if stored below 0⁰ Celsius?

Assume that we have a plant, e.g. kale, which is prone to amylolysis if not harvested during a frost period. If it is harvested and put in a household freezer, such that it is frozen solid slowly ...
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1answer
78 views

How many plants are needed to survive in an airtight chamber?

How large a garden do you need if you are to survive on them producing enough oxygen in a closed chamber? And which are the most effective plants?
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0answers
35 views

Why is this dry pepper fruit still “powered”?

Check out this photo of my pepper plant this cloudy morning: (click for full res) Usually (and this can be seen on 2 and a half of the 4 fruits in this pic) the fruits are "disconnected" from the ...
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1answer
69 views

Identification of this plant?

Photographed in Rocky Point, Mexico. Any ideas about this plant? Thank you!
2
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1answer
213 views

Independence of Light independent reaction in photosynthesis?

Inspired by a question asked to me by a classmate, I have the following question about Light-independent (dark phase) reactions in photosynthesis:- Let us suppose an algae sample was exposed to ...
0
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1answer
32 views

Ribosomes and DNA in chloroplast

Are there multiple copies of circular DNA and membrane bound ribosomes IN CHLOROPLAST ? Are polysomes found in them ?
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1answer
88 views

Can a plant be programmed to produce any arbitrary object?

I'm wondering if a plant can be programmed (by modifying its genes) to grow into any shape that it's programming instructs. I understand that a plants genes are its instructions of how to convert the ...
5
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1answer
154 views

Measuring algae growth or death

My daughter (10th grade) is doing a science fair project on the toxicity of triclosan for the algae Selenastrum capricornutum. She is wondering the best way to measure the effect, given the limited ...
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1answer
262 views

How to determine if a plant is autotrophic or heterotrophic?

How do you determine if a plant is autotrophic or heterotrophic, and are there any traits in particular that can be used to classify species? As two examples, how should Melampyrum pratense and ...
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4answers
1k views

How do trees lift water higher than 10 meters?

The atmosphere pressure is 10 meters of water (approx). This means that it is impossible to lift water higher than 10 meters with vacuum or сapillary action (on Earth, under normal conditions). There ...
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1answer
384 views

Family tree for edible plants?

I am looking for a family tree for plants, particularly veg / herbs / fruit. Something similar to: If it could be slightly less technical than all the Latin ...
4
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1answer
126 views

Function of papain in papaya

I know that papain is a proteolytic enzyme present in papaya. It is often used to tenderise meat. What is the function of papain in papaya? Is papain sweet? Does it function as an antibiotic?
5
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1answer
62 views

Shade-loving Plants

In shade-loving plants, the light compensation point is reached at low irradiance because: A. Leaves have more chlorophyll per reaction center B. These plants have greatly reduced respiration rates ...
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1answer
183 views

Change of phase from juvenile to adult in plants

I tried googling this but couldn't get much information on this. Most of the articles were about induction of flowering. I am more interested in knowing what factors influence the conversion of ...
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1answer
164 views

Organelles present in sieve tubes

I know that sieve tubes do not have ribosomes, nuclei and cytoskeletal elements. What other organelles does it not have? Does it have a cytoplasm?
3
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1answer
57 views

What is the cause of the spots on this leaf?

On a hiking trip to the Alps I found trees whose leaves showed those spots you see on the picture. I am curious about what the cause is. Higher resolution pictures of front and back side.
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1answer
148 views

What is this awesome plant, which can close its leaves when touched?

I came across this video on Facebook where a plant closes its leaves when touched. Unfortunately the video does not mention the name of this awesome plant. What's the name of this plant, and where ...
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3answers
2k views

What evolutionary adaptations cause trees to grow tall?

I think there are some obvious costs for trees to grow tall. Carbon and other nutrients costs, maintenance cost, energy cost (for growing, to bring water (and nutrients) up to the higher leaves, ...
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0answers
35 views

Root hair formation in Arabidopsis

In arabidopsis, 2 cell types arise in the root epidermis : root hair cells and hairless epidermal cells. The immature epidermal cells that are in contact with 2 underlying cells of root cortex ...
2
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2answers
168 views

Why don't plants get sunburned?

I just saw a video about the biology between sunburn, UVA and UVB and the different things we know about sunburn in humans. ( http://www.youtube.com/watch?v=ZSJITdsTze0 ) I wonder what keeps plants ...
8
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4answers
2k views

Why we have no enzyme to digest cellulose?

As we know, cellulose is the most abundant polysaccharide in nature. Why don't we have any enzyme to digest cellulose?
3
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1answer
160 views

Plant a whole fruit or only seeds?

I'm trying to figure out whether it is better for the plant to reproduce by planting its whole fruits with seeds inside them, or picking the seeds out and planting them without the fruit. In my case ...
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2answers
75 views

Tree census data for Sweden/Scandinavia?

Is anyone aware of any attempts to count or approximate the number of trees there are in Sweden or Scandinavia? I have a small popular science side project for which this would be useful
0
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1answer
42 views

What determines the strength of a tree

What determines the strength of a tree. A morphologically strong looking tree found broken down at trunk. can we determine the strength/ life of a plant