Questions tagged [growth]

In reference to a biological system over time, growth refers to the increase in physical size/mass as well as the progression through its life cycle.

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Can plants grow healthily being watered in either deionized or distilled water? [closed]

I want to use deionized/distilled water to water plants from some. I have the choice whether to use tap water, deionized water or distilled water that come from a closed system that has a water cycle, ...
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Which approach is the common one in the literature for determining the bacterial growth rate?

I have the following data, which is OD600 (the second component) vs. time (the first component): ...
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Why Plants growth has a significant contribution of cell elongation growth?

Plant Growth is characterised by three phases- Cell division , Cell elongation and Cell maturation, where Maturation is just specilisation of cells, Only major contributory effect in growth is of cell ...
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Biology Experiment Algae pH & temperature help?

I am planning a Biology investigation for my IB IA on the impact of temperature and pH on algae growth. Does anyone have tips on how to measure the growth rate of algae? What algae is the most suited ...
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Make plant experience 2 growing seasons per year by moving it across equator semiyearly

If I take a typical plant (such as e.g. a rosemary plant or an avocado sapling) across the equator from Florida to Brazil and back every year, so that the plant experiences Spring in both places, will ...
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Is it true that, prior to puberty, there are no physical differences at all between boys and girls (except for their private organs)

And that even their physical appearances are exactly the same? This seems very counterintuitive and goes against many people's personal experiences and observations when they were kids. But i have ...
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How long to regrow hair?

This is one of the questions I wasn't exactly sure where to post. Basically, I want to make an X-Men parody, and for the part of Professor X I need to shave off my hair. Now I have a simple french ...
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Do slime mold expand or multiply?

After reading about slime mold I was wondering, do slime mold simply expand outwards or multiply? e.g. if I put 100 grams of slime mold in 1 location, will it expand to say, 2 locations, and have the ...
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Is there a favoured mathematical model of bacterial growth?

One of the most regularly measured phenotypes in bacterial synthetic biology is growth. Anyone who does wet lab microbiology or synthetic biology will have performed a growth curve measurement. ...
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Growing Penicillium Digitatum Mold

I left a cup of tea with Lemmon on my desk and after a while green mold start growing on the water. From my understating this is Penicillium digitatum. I gave it some sugar and after one day black ...
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Why is DNA replication so much faster in prokaryotes than eukaryotes?

There are many statements to be found on the internet of the sort: “DNA replication occurs at elongation rates of about 500 nucleotides per second in bacteria and about 50 nucleotides per second in ...
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What is the mechanism through which fractals arise in plants and animals?

Many biological organisms -- such as trees, broccoli, and the blood vessels in animals -- can be approximately described using fractals. What is the reason behind such fractals? Specifically, do we ...
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Is it possible to determine the initial population given the final one?

It is possible to determine the initial population of, say, bacteria given a measure at a later time? Let's say I use the logistic growth model $$\dot N (t) = rN(t)\left(1 - \frac{N(t)}{K}\right)$$ ...
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Giant insects growing question

During the dinosaurs time 100-200 million years ago there were giant insects like 1 meter long. An example is here. One of the theories why they could grow this big is that oxygen level was much ...
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Do babies have a fight or flight response?

Do babies react in the same way as young children and adults in regards to the fight or flight response? If they do not respond in a similar way or don't have a fight or flight response at all then at ...
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Why is cognitive maturity related to organism lifespan in larger animals and mammals?

I am not a student of biology, so I should provide some context to me asking this rudimentary question. While doing a graduate-level course on Reinforcement Learning, the instructors focused on how we ...
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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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What to do with this Araucaria sprout

I live in Santiago, Chile, and I see this Araucaria frequently: For what I have read, it seems to be a female A. angustifolia individual (leaves are 2-3 cm long and a few mm wide, with a very sharp ...
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A question about microbes growing media

I was told in my microbiology course that blood agar can be put in GasPak system (anearobic) to grow strict anaerobes, but why would someone use blood-dependent bacteria in this experiment as these ...
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Can the human body store protein?

I am interested to know if a human body can store protein. Absolutely for the bodybuilders, does it really matter if they divide their protein consumption during the day or eat all of it in one meal ...
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Is any animal born adult-size?

Size growth after birth seems to be the norm in the animal kingdom (as well as among plants). This makes sense. It's evidently physically challenging for an animal to produce an offspring of its equal ...
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What is the substance that tumors release that stimulates growth of blood vessels but suppresses its release from other tumors?

I'm currently in high school and I am working on a cancer research project. My project consists of a cancer, and different ways to treat it. I have a set of benign tumor and I was thinking of ...
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Alternative to Lotka Volterra

Would you guys know any kind of differential equations that would dictate population growth without relying on Lotka Volterra ? Thanks ^^
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Bacterial Growth Formula

What are the units of $N$: the colonies of bacteria or the viable cell count? This is in regards to the bacterial growth formula used during serial dilutions, $$ N =N(0) e^{kt} \quad . $$
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Age until physical growth ceases, mammals

Fairly basic, but I am seeking a table showing how many years from birth it takes for the best-known mammals to stop growing. (Including the latest on humans - ie. 0-17..?).
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Per Capita Population Growth Rate and Exponential Growth. Rate constants

As many of us might know, the set up of a differential equation relating instantaneous population growth with respect to time to the per capita population growth rate and current population size at an ...
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Growth rate oscillation in the a population of non-interacting bacteria

I have come across this theoretical paper claiming that if you start a batch culture from a single E. coli cell, the exponential growth rate of the population defined as $$k = \frac1N \frac{dN}{dt}$$ ...
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What do bones need to grow outside the body?

In what environment outside of a living organism can bones grow? If I were to put an arbitrary human bone in a room and attach a bunch of tubes to it, or dunk it in some kind of solution, where would ...
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What are the evolutionary reasons behind men being taller than women?

Human men and women are sexually dimorphic: there are some phenotypic differences between men and women. Men being taller than women is an accurate stereotype. Overall, men are on average 13 ...
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Why does eyebrow growth stop after it reaches a specific length?

When compared to hair that grows forever after we cut it, why do eyebrows stop growing? What genes measure current length of eyebrow to ensure it stops growing after a specific length?
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The correlation between a leaf's age and its length in the initial stage of growth [closed]

I am building a machine learning algorithm which predicts the age of a leaf before its maturity period based on its measured length or area. I would like to know whether there is a mathematical ...
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What is Growth and how can we define it to be a defining property of life?

I was reading a book and it said that internal/intrinsic growth is defining property of life and not extrinsic growth as saying accumulation of dust on a book makes it a bit bigger, even if it is by a ...
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Archenteron vs Gastrocoele

What is Difference between “Archenteron” and “Gastrocoele”. Are they same or different? Gastrula is characterized by Archenteron or Gastrocoele or Both?
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Beyond anabolism, what are factors that restrict growth rate?

Beyond obvious constraints in the case of nutrient limitation, what can explain the relatively slow growth rate of cells in rich media? Lab strains of E. coli grow really, really fast. The cell ...
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How do I determine this logistic growth model formula?

The Question Two yeast cells were placed into a special container to which food was continually added, to keep it at a constant concentration. All other factors were set for optimal yeast ...
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Since frogs are ectotherms and supposed to have low metabolic rate, why do they grow so fast and eat so much?

It's always emphasized in literature that endothermy enables high growth rates but requires more food. But look at frogs, for example: bullfrogs, toads, pacman frogs etc. They would readily eat a ...
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Why do seeds grow upwards?

Why do seeds grow upwards? Surely gravity would pull them towards the earth's core? Can anyone shine any light on this? Do seeds that are planted deeper grow more quickly.
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Can you accelerate the growth of a plant by accelerating its surroundings?

I had this weird idea of making plants grow faster when I first visited an indoor nursery which used floodlights instead of sunlight. They turned on during the day and went off during night in cycles. ...
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due to hypersecretion of growth hormone why only terminal growth takes place?

why only terminal growth takes place in acromegaly and gagiantism, due hypersecretion of GH?
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Does estrogen increase muscular growth in females?

Regarding humans it is said that most psychological effects caused in men by testosterone are caused in women by estrogens. There are many studies on that, particularly regarding temporary shifts of ...
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Why are humans only so tall/large?

In biology I've learned that cells rapidly divide and can grow and split undefintely, and that certain parts of the body have to grow and evolve before growing, but I am tied up on the fact that the ...
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Does a cell deprived of growth factors undergo apoptosis or G0 stasis?

I can't seem to find a decisive answer on this topic in any of my textbooks. If a cell is deprived of growth factors does it: Activate apoptosis Go into the G0 phase but keep living? Thanks.
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Selective pressure for reduced rates of growth and maturity in primates

Humans are somewhat notable for the slow rate at which they grow and reach physical maturity. Some related primates also take over a decade to reach sexual maturity. However, many mammals – ...
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Breeding mosquitoes at lower temperature

It is well known fact that, to slow down the growth of drosophila, they are grown at 18-19 degree Celsius. It helps in maintaining stocks for longer time without frequent change of food. Is it ...
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Is an animal's body height dependent on its environment?

Imagine the follwing situation: a newly born animal is brought into a small room. This room has no windows, but artifical light to imitate the sunlight. Furthermore, this light behaves like the sun, ...
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How do trees grow?

A nail is inserted into a tree's trunk at a young stage of its development. At which height will we find the nail after some years? Will it be found higher or at the same height(What extent of ...
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The actual name of growth force

I see how large trees and weeds that are capable of splitting concrete, and realized that I have no idea what this phenomenon is officially called. Google was no help, suggesting root pressure, but ...
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Why do cherries sometimes grow as triplets?

Usually when I think of cherries, I think of them as pairs. I think most of us imagine them that way, but recently, I stumbled on a picture of a triple cherry: Which I found interesting, but I couldn'...
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Are nastic responses growth responses?

I know they are non directional movement responses, but like tropic responses, does their movement involve growth?
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Do all body organs grow in proportion during the period of physical development?

It is obvious that during childhood and puberty, the human body grows uniformly or proportionally so that a child's arm length, for example, is shorter than an adult's arm length but is proportional ...