Questions tagged [plant-physiology]

Study of the normal functioning of plants and plant cells

Filter by
Sorted by
Tagged with
-1
votes
1answer
30 views

Why and how do Stomatal Guard cells turn flaccid at night time and cloudy days, and turgid during the days?

If I'm correct, the guard cells turn turgid during the day and flaccid at nights. What is the reason behind the same and how is it done? (im a noob highschool student, so basic explanations are ...
0
votes
0answers
19 views

Will plant cells absorb “atypical” chemicals dissolved in water, by diffusion or otherwise?

I want to know what determines whether a chemical dissolved in water, will or will not be absorbed into a plant. I imagine this can happen at a few different levels -- through roots, or at a cellular ...
2
votes
0answers
23 views

What causes the distinct color change in matured leaves in some plants?

Maybe that color change is caused by lower chlorophyll concentration in younger leaves' cells, or chlorophyll a to b ratio differs between younger and older leaves. All I could find is that the ...
0
votes
0answers
34 views

Can Monsanto's (in)famous hybrid seed crops be cloned/grafted? If not, is there a technical or legal reason?

I understand that the seeds of a crop made from modern-day super hybrids will not, usually, produce the same quality plants in the next generation.... Therefore, farmers have to buy new hybrid seeds ...
1
vote
0answers
10 views

How does a diploid sporophyte form in non-recurrent apomixis?

I came across this definition of non-recurrent apomixis which occurs in angiosperms- In non-recurrent apomixis, both the egg-cell and embryo are haploid and embryo is developed directly from an egg-...
8
votes
0answers
47 views

What actually kills a plant that requires winter dormancy if it is kept indoors all year?

In bonsai practice, beginners will commonly purchase a juniper (often Juniperus procumbens 'Nana'), which is an outdoor tree, and keep it inside all year. The tree invariably dies. It is commonly ...
0
votes
0answers
29 views

Is there “stem” organelles in plant meristems?

Two cytoplasmic genomes exist in plant in addition to the nuclear one. As far as I understand, they divide more or less during the entire life of the plant along with cell proliferation/growth in ...
0
votes
1answer
39 views

Is there a scale suitable for continuous tracking and recording of plant weight?

I want to measure water transpiration and evaporation in a bonsai tree, and measuring the weight of the tree in its pot is my proxy for water usage. This has worked well with manual measurements, but ...
1
vote
2answers
84 views

Can plants absorb organic compounds?

Plants are autotrophs, meaning that they grow by building organic matter out of inorganic compounds (and energy). Is it then also true that plants are generally not capable of absorbing organic ...
2
votes
1answer
29 views

Do spring varietes of cereals have a process of vernalization?

I was wondering about this question - Do spring varieties of cereals have some process of vernalization? It would be nice to have some description of the main processes' differences of spring and ...
0
votes
0answers
39 views

Can you grow a plant from a seed to flower stage with only Aeroponics system

I have recently started studying indoor farming with the help of aeroponics system. But from what I know have read (I may have misunderstood or misread something, so please excuse me for that). The ...
1
vote
0answers
24 views

Regarding secondary growth in dicotyledonous angiosperms

I had read that (and as this image shows) the secondary and primary phloem eventually get crushed due to the repeated division of cells forming the secondary xylem, during secondary growth in ...
1
vote
1answer
73 views

What will happen if one keeps the photosynthesis plant active 24x7? [closed]

While reading this article online something said on it made me wonder. Also, there have been suggestions and a Dawn / Dusk type of ramp up and down to simulate the slow changes in the sun have value, ...
4
votes
3answers
173 views

Production of plant derivatives using genetic engineered micro-organisms

I saw a Thought Emporium video where spider silk was produced by genetically modifying yeast. I have also read about companies making vanillin (vanilla flavour) using this technique. I am curious to ...
4
votes
1answer
89 views

What is the mechanism by which seeds stay alive while in storage? [closed]

I know folks who store seeds for months and sometimes a year before planting them. What is the mechanism by which they stay alive? Also some associated questions: How do the cells in the seed stay ...
1
vote
2answers
81 views

How to extract oxygen from grow chamber

I have been developing LED grow lights for a year or so and one of the things I am trying to do is to build a grow chamber where I can control temperature, humidity, light intensity and quality and ...
3
votes
2answers
94 views

CAM Photosynthesis Oxygen Generation?

I've been looking into CAM plants - notably the snake plant which is native to West Africa. Upon researching the CAM photosynthesis cycle, I've found it fascinating that the plant stores CO2 at night ...
0
votes
2answers
60 views

What material is permeable for plant roots, but “impermeable” for fungi & bacteria?

I'm designing an experiment where the roots of the plant will grow in a sterile environment while the shoot will grow in a non-sterile grow room. For this reason the environments of the shoot and the ...
0
votes
2answers
36 views

Hybrid seed production requires a male sterile parent. Why?

Hybridization is the process of crossing two plant species or varieties. In this case, two varieties of plants. In plant breeding, crossing is a very useful technique to improve the features of the ...
0
votes
0answers
37 views

Is there a known efficiency rate for CO2 capture from ambient air in photosynthesising plants?

When humans take in air to their lungs, we capture about 5% of the total quantity of the air as oxygen (which in turn equals about 24% of the available oxygen in the air) Is there an equivalent rate ...
0
votes
1answer
84 views

Osmotic pressure and turgor pressure details

I am a high school student and I am very confused in how we define osmotic pressure? Osmotic pressure is defined as the pressure required to stop the diffusion of solvent into a solution by applying ...
-1
votes
1answer
45 views

Plasmolysis and turgor pressures

I am a high school student and I am a little confused in plasmolysis, when we study plasmolysis, we say that at limiting plasmolysis, the turgor pressure OR pressure potential reduces to 0 what do we ...
-1
votes
1answer
75 views

Light intensity effect on plant transpiration

In the graph of light intensity versus rate of transpiration, the rate increases up to a certain point but then remains constant. What is the reason that it stays constant, is there a limiting factor ...
1
vote
0answers
24 views

Why certain COGs appears more often in Humans Bacteria but not in plants Bacteria

I'm doing a Bioinformatic project from the university where I got a DB of COGS from Human & Plants Bacteria genomes and I need to find distinguishing sets in this DB and explain the biological ...
1
vote
0answers
26 views

Does every ovule undergo fertilization at the same time?

After fertilization ovary becomes the fruit and ovules develop into seeds. Does this mean that all the ovules undergo fertilization at the same time?
1
vote
0answers
23 views

What is the use of having 3 antipodal cells and 2 synergids?

The embryo sac which is developed from functional megaspore contains 8 nuclei.2 polar nuclei and egg fuses with sperms.3 antipodal cells and 2 synergids degenerate after fertilization.Then what is the ...
-3
votes
2answers
67 views

Why doesn't the rate of photosynthesis increase with increasing light energy (frequency)? [duplicate]

Why doesn't the rate of photosynthesis increase with increasing light energy (frequency)? I know that green light is not absorbed by chlorophyll, yet I am confused as to why this certain "...
0
votes
0answers
33 views

Have cruciferous vegetables been genetically altered to reduce cooking odors?

As a young girl my mother always kept a bottle of "Air Wick" under the kitchen sink. When she cooked cabbage, cauliflower, broccoli, etc., she would open the bottle, pull out a green sponge ...
0
votes
0answers
121 views

Plants with nutritional requirements similar to Cannabis

What are some short plants that preferably could be grown indoor which have similar nutritional requirements (in terms of N-P-K ratio, doses etc.) as Cannabis? The purpose of this is testing a mineral ...
3
votes
1answer
86 views

Inbreeding of selfing and outcrossing plant

I am reading John H. Gillespie's Population Genetics A Concise Guide Section 4.3 Inbreeding. I do not understand these two paragraphs quoted below concerning selfing and outcrossing. The first ...
0
votes
0answers
53 views

Help identifying a part of a flower

I researched about floral diagrams and this is what I found:- This is floral diagram of Theobroma cacao. I managed to identify others but this part near the stamens was not found anywhere. Also the ...
4
votes
1answer
91 views

What part, roughly, of the carbon in a plant comes from the soil? As opposed to the atmosphere?

C4 plants contain a slightly higher percentage of carbon-13 than C3 plants. Is this because of carbon obtained from the soil or the atmosphere? I have read that plants using different chemical ...
1
vote
1answer
26 views

How does transpiration help in sucking water up?

How can transpiration help in sucking water up as the amount of water that is sucked up by the evaporation of water equals to the amount of water evaporated. (Correct me if I am wrong). Then how it ...
2
votes
1answer
56 views

Do sieve tube cells have any extrachromosomal circular DNA at maturity?

In order to generate a tube system of low resistance, sieve elements lose most of their cellular components such as the nucleus, cytoskeleton, ribosomes, tonoplast etc. Mature sieve elements contain ...
0
votes
1answer
53 views

Can we produce sugar using chlorophyll dissolved in ethanol?

I can't find anything about this on the net. I read in my (high-school) textbook that if plants get sunlight, water and carbon dioxide, and the catalyst called chlorophyll, they can make sugar. I'm ...
2
votes
1answer
42 views

Giving a sign to Pressure Potential, Osmotic Potential And Other Similar Quantities

When these quantities are mentioned with what reference do we give signs to them? Why is Osmotic Pressure positive, but Osmotic Potential, negative? What about Turgor Pressure (Pressure exerted by the ...
4
votes
1answer
130 views

Are sizes of potatoes normally distributed?

I'm currently researching the variability of sizes of potatoes when all of the potatoes in question have been harvested from a single field. One question keeps coming up in my statistical analyses: ...
2
votes
2answers
58 views

How would one track a mineral nutrient in a plant in order to prove that nutrient has been re mobilized?

Before abscission - senescence of a plant structural components that contain mineral nutrients (E.g. Magnesium, Potassium...) are re-mobilized from the senescent tissue and used in other plant tissue ...
1
vote
0answers
9 views

Where can I find a cannabinoids profile of hemp strains?

For my web article, I need to find out the content of individual cannabinoids in hemp strains, specifically for Kompolti, Carmagnola and Purple Haze. I mean the content of all the components, not just ...
0
votes
1answer
41 views

Bougainvillea flowering problem

My bougainvillea plant hardly flowers and only at the tips. It has one very long vertically growing stem(if I may call it so). Is this an example of apical dominance. If so how is it to be corrected? ...
0
votes
1answer
44 views

rapidly growing mold on flat surface

For an experiment I'm conducting, I need to grow mold on a 2 foot square piece of white fiberglass. I'm in Florida, with high heat and humility, so mold already grows easily. I've seen elsewhere that ...
7
votes
1answer
91 views

What is the fate of the typical tree?

Walking through the local established broadleaf forests dominated by oak and tulip poplar (Eastern U.S.), it is common to find patches of young tree saplings, say 10-20 oak or tulip poplar saplings ...
0
votes
2answers
226 views

Are there any thermogenic plants which are suitable as houseplants?

I have been wanting to supplement my heating system with some plants that produce heat! I have become aware that there are around 14 species which generate significant amounts of heat for example the ...
2
votes
2answers
72 views

Are all dead plant cells (that die to do a job), have secondary wall?

Can we say that all plant cells that die to do a job (they are dead now), like the outer cell surface of the root cap, have secondary cell wall?
2
votes
2answers
201 views

In plant cells, is water stored only in the vacuole?

In the turgor of plant cells, is water stored only in the vacuole or can it be stored in the cytoplasm and the other cellular organs too?
2
votes
1answer
81 views

How quickly are plants able to sense changes in light intensity?

Evidently due to the process of photosynthesis, plants are able to "sense" light (as demonstrated by the phototropic response). My question is, how quickly are plants able to perceive ...
3
votes
1answer
71 views

What is the pH of cytosol? And plastids?

My teacher ask this question, and I answered 7 to 7.4, but she said it's wrong. I read a lot and found the same answer (wikipedia) I'm here asking for confirmation of this and the pH inside & ...
7
votes
2answers
206 views

Can plants break down cellulose for energy?

I know humans and other animals start using their own proteins as food when starving. This made me wonder if a plant that is deprived of sunlight, after using up its sugar reserves and other carbs, ...
1
vote
1answer
41 views

Floats of Algae, a house-made conjecture

Background In North of Scotland there are many seaweed types. One is a green algae (chlorophyta). They are full of 'bubbles'. According to web searches one of those bubbles (there are two types you ...
0
votes
0answers
21 views

Do chilli peppers change in composition after they change color?

I grow some chilli peppers and was wondering when the time is right to harvest them. Of course gardening-focused sources say that they are ripe when they change color. This usually happens very ...

1
2 3 4 5
10