Questions tagged [plant-physiology]

Study of the normal functioning of plants and plant cells

Filter by
Sorted by
Tagged with
3
votes
1answer
39 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
votes
0answers
9 views

Chlorin ring radical cation

I have read about light and dark reactions of photosynthesis. However, I couldn't find any source showing the direct mechanism by which chlorophyll radical cation is formed: which bond is broken when ...
0
votes
1answer
22 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
2answers
45 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 ...
2
votes
4answers
236 views

How many nutrients do trees process daily?

Is this tree fact below that I have found on social media sites true? I don't know the source of the quote. It's pretty amazing. I'll be glad if someone can provide the source too! Natural Wonders ...
2
votes
1answer
30 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 ...
2
votes
1answer
35 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
30 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 ...
6
votes
1answer
74 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 ...
4
votes
1answer
118 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: ...
3
votes
1answer
271 views

How to measure the biomass of hydroponic plants in netpot/rockwool DWC system?

I'm doing an experiment with 4 kale plants, each in their own small deep water culture (DWC) system. Each plant was transplanted in rockwool with netpots and clay pebbles. But I need to periodically ...
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
35 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? ...
4
votes
1answer
207 views

How many cells are there in the apical meristematic tissue?

How many cells are there in the apical meristematic tissue? Looking at this picture... , I would tend to think that there are few hundreds cells in the meristem tissue. But I guess this is a picture ...
6
votes
1answer
132 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 ...
2
votes
2answers
59 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
2answers
59 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?
0
votes
1answer
33 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 ...
4
votes
4answers
1k views

Stomata during night (respiration)

How does carbon dioxide from respiration diffuse out of the leaf during the night? Do stomata close completely during night?
22
votes
6answers
6k views

What determines the spiral direction of plants?

Some plants and vines spiral clockwise as they go along (right direction) and some spiral anticlockwise (left direction). What determines which direction they spiral along? At first, I believed it to ...
0
votes
2answers
74 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 ...
4
votes
1answer
70 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
71 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
63 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 & ...
0
votes
0answers
17 views

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 ...
-1
votes
1answer
80 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? ...
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
vote
1answer
38 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
1answer
44 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 ...
4
votes
1answer
71 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. ...
4
votes
0answers
775 views

What metabolic processes do dormant and ungerminated seeds carry out?

What metabolic processes does a dormant embryo in a seed carry out? Seeds will not germinate, either because of a lack of favourable conditions, seed hibernation, or because of a genetically pre-...
0
votes
0answers
8 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?
1
vote
0answers
12 views

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 ...
0
votes
0answers
8 views

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 ...
0
votes
1answer
34 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 ...
5
votes
1answer
146 views

Why does water stress lead to alkalinity of xylem sap in plants?

I was reading this book: Plant Physiology and Development, Sixth Edition by Lincoln Taiz, Eduardo Zeiger, Ian M. Møller, and Angus Murphy when this doubt came to my mind. Abscisic acid, the stress ...
0
votes
0answers
11 views

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.
0
votes
1answer
23 views

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 ...
34
votes
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/...
2
votes
2answers
3k views

Why don't self pollinated crops show inbreeding depression?

Being continuously self pollinated means the fusion of same/similar genes from time to time, then why don't they show such a decrease in productivity?
0
votes
0answers
22 views

Emerson's 2nd effect/ Emerson's enhancement effect and evidence of existence of 2 photosystems

(https://i.stack.imgur.com/Qbai6.jpg) https://en.m.wikipedia.org/wiki/Emerson_effect I can't understand why is there a need of 2 photosystems (2 interconnected pigment systems) to explain Emerson's ...
0
votes
0answers
24 views

How does wall pressure oppose osmotic pressure?

This question is based on the equation: Diffusion Pressure Deficit= Osmotic Pressure - Wall pressure I know that wall pressure is directed towards the protoplasm. I need to make sure if osmotic ...
0
votes
2answers
68 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 ...
33
votes
2answers
3k views

Can any animals photosynthesize?

Plants and animals have the following distinct properties: Plants live from solar energy by photosynthesis, they use solar energy to make sugar and oxygen out of carbon dioxide, which gives them ...
1
vote
0answers
21 views

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 ...
1
vote
3answers
7k views

Blue light in a fridge. Is it really beneficial or just marketing?

Recently while visiting a shop with electronics I saw a fridge with a huge advertisment sticker going more or less like this: There's blue light source in this fridge so there will be less bacteria ...
2
votes
3answers
133 views

Are agave plants perennial?

If I were to harvest an agave plant for its nectar, would it kill the plant? I have watched videos of the process and it seems quite invasive.
1
vote
1answer
1k views

Why does spiral or annular thickening occur in water conducting plant vessels?

From what I behold, spiral and annular thickening of xylem and trachied cell walls leaves a lot of not thickened regions of cell wall. Lignin is the material which prevents water from escaping these ...
4
votes
3answers
1k views

Why is amylose insoluble in water?

In a handout the following is stated: Amylose is insoluble in water, therefore a good storage compound e.g. in stroma of chloroplasts This is with regard to the chemical structure of the molecule. ...
3
votes
2answers
2k views

Is Valerian extract a diuretic or an antidiuretic?

I am trying to determine if valepotriates (valerian extract) is a diuretic or an antidiuretic. Some individuals take valerian as an herbal supplement for anxiety disorders. Some individuals claim that ...

1
2 3 4 5
9