Questions tagged [plant-physiology]

Study of the normal functioning of plants and plant cells

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23 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 ...
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29 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 ...
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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 ...
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33 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 ...
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1answer
54 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 ...
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1answer
34 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 ...
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1answer
40 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 ...
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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 ...
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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?
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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 ...
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59 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 "...
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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 ...
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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 ...
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1answer
73 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 ...
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44 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 ...
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1answer
52 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 ...
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1answer
25 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 ...
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1answer
40 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 ...
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1answer
46 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 ...
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1answer
38 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 ...
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1answer
125 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: ...
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2answers
50 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 ...
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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 ...
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1answer
36 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? ...
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1answer
37 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 ...
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1answer
83 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 ...
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138 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 ...
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63 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?
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98 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?
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1answer
78 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 ...
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1answer
64 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 & ...
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120 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, ...
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few questions about active thylakoid isloation

I need to isolate active thylakoid, I have few questions regagrding: why there is a need to do so in low temp enviormant? (3-5°C) im not sure if it is due to protease activity or something else. why ...
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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 ...
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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 ...
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9 views

Difference between the number of ps I and ps II complexes in cyanobacteria and plants

the number of photosystem I complexes are more than the number of photosystem II complexes in cyanobacteria, while this is opposite in plants. why? Is this related to the type of respiration?
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1answer
46 views

Genetic mutations in plants

I am trying to plant some trees which are usually native to colder climates into Subtropical climate, is there any possibility that if i plant these 20 trees saplings in winters they will grow to be a ...
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Is it possible to accelerate active transport in plant vascular system using some electronic method?

I am from electronics background and got an understanding that electrical current affect plant growth. Based on this phenomenon, I got an idea but before I formulate my hypothesis and start ...
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Does the source (above or below ground) of an auxin alter its effects?

If auxins typically inhibit shoot growth (as happens when the apical bud produces and transmits auxin to the shoots below, inhibiting their growth), while typically stimulating root growth (which is ...
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1answer
202 views

Trees growing around objects vs pushing them away. Where is the threshold?

If a tree grows against a taut wire then the tree will grow around it, eventually enveloping the entire wire. This often scars the tree, and if the wire is thick enough, it will interrupt nutrient ...
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1answer
35 views

Do plant cells recycle carbon dioxide from their respiration during photosynthesis? [duplicate]

It seems one of my colleague's biology textbook claims that plant cells, with presence of light, feed back 100% of carbon dioxide molecules from their respiration into photosynthesis. Can you say that ...
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Protein content in chemical composition of different phyla?

The protein content in the human body is roughly 15%, what are the percentages for other organisms? Bacteria, plants, fungi, protozoa, etc.
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1answer
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How can I make legal mature female Cannabis plants to Flower in home during March (springtime)? [closed]

In December 2019 I purchased 4 Cannabis seeds Legally in Canada.Two of my plants are now about 100 cm tall. I am using wide-spectrum LED grow lights and have fertilized them both. I started with 16 ...
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10answers
11k views

If plants benefit from carbon dioxide, why is car traffic something bad?

This is going to sound really stupid or as a joke, but... Ever since I was a little kid, I have been confused about the following: Humans need air/oxygen to breathe in order to live. Plants/trees/...
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1answer
73 views

Does photosynthesis begin instantly when a plant is exposed to light?

I'm curious to know if the process of photosynthesis has a "ramp-up" time to become useful to a plant, or if it begins instantaneously when the plant is exposed to light after a period of darkness. ...
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1answer
87 views

Why do guard cells open stomata when they are swelling?

As the concentration of potassium inside guard cells increases, water enters the cell by osmosis. But why does the swollen causes the stoma to open? Does it relate to the thickness of the cell wall? ...
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2answers
74 views

Osmotic pressure

Osmotic pressure is defined as: The pressure that would have to be applied to a pure solvent to prevent it from passing into a given solution by osmosis. And yet water moves from low osmotic ...
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Are Hsp70 proteins only activated in response to heat shock?

Hsp70 proteins are chaperones that assist in protein folding in my plant physiology textbook it says the Hsp70 proteins were discovered by inducing heat shock. But do they only work in response to ...
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Spatial sequence of autumn leave colouring: top to bottom

Leave colours on trees seem to vary on the same tree from top to bottom. Leaves higher up are already further ahead in the shedding process. What's the reason for this tempero-spatial gradient?
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1answer
315 views

How is C4 pathway more water efficient than C3 pathway in photosynthesis?

In the C3 pathway: 1 H2O molecule is required for the fixation of 1 CO2 molecule. In the C4 pathway: The only H2O molecule used is in the calvin cycle, so 1 H2O molecule required for fixation of 1 ...

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