Growth in multicellular organisms involves two main processes - growth and development. Growth refers to a permanent increase in size through cell division and cell enlargement. It follows distinct phases including cell division, cell elongation, and cell differentiation. Development refers to qualitative changes that involve cell specialization. Growth can be measured through parameters like height, weight, surface area, fresh mass, and dry mass. Primary growth in plants occurs through cell division at the apical meristems, increasing length. Secondary growth thickens stems and roots through the activity of vascular cambium, adding rings of xylem and phloem.
A Level Biology - Classification and Biodiversitymrexham
This is a PowerPoint presentation for Topic 3 in the Edexcel Biology B A Level course that starts in 2015.
This is a free sample, the full PowerPoint presentation is available to purchase here: https://sellfy.com/MrExham
A Level Biology - Classification and Biodiversitymrexham
This is a PowerPoint presentation for Topic 3 in the Edexcel Biology B A Level course that starts in 2015.
This is a free sample, the full PowerPoint presentation is available to purchase here: https://sellfy.com/MrExham
Disassembling Of the old working pc
In this Instruction, I will give a full documentation of how to disassemble a desktop PC, for parts. The specific computer that I will demonstrate with is an HP Media Center PC m7640n with a dead motherboard. Every computer is different, but this is a general guide.
If you don't fully grasp what I mean when I am describing something, please refer to the pictures!
Step 1.
Selection the required tools and equipment:
1. Screw Driver.
2. Multimeter.
3. Soldering iron.
4. Contract cleaner.
5. Brush.
Step 2.
To turn off the power:
If the PC being running, must shut down the pc before disassembling.
There are many ways to shut down your PC—you can turn the PC off completely.
Turn your PC off completely
To shut down:
For Windows 10 Select the Start button and then select Power > Shut down.
For Windows 8.1 / Windows RT 8.1
Move your mouse to the lower left-hand corner of the screen and right-click the Start button or press Windows logo key + X on your keyboard. Tap or click Shut down or sign out and choose Shut down.
For Windows 7 Click the Start button and then click the Shut down button. Click the Start button and then click the Shut down button.
Step 3: Unplugging
The first thing you do, is unplug every cable that's plugged in to your computer. That includes the following cables:
________________________________________
• Power
• USB
• Firewire
• Mouse
• Keyboard
• Internet
• Ethernet
• Modem
• AM\FM Antenna
• Cable TV
• etc...
So pretty much just unplug every cable from your computer.
Step 2: Outer Shell/Casing
Now that your computer is fully unplugged, move your PC to a clean work space, preferably a carpet. The carpet is better than tile, because screws and other small parts will roll around.
NOTICE:
If you are working on a carpet, about every five minutes touch something that is grounded (Sink faucet\pipe, wire coming from the ground part of a wall outlet). This is so you don't shock your motherboard or other parts.
First off, unscrew the four screws on the back of the computer. On most computer cases, there will be large knobs that you can unscrew by hand or by screw driver on the back-right side of the computer. The left side has small screws because on that side you can't access much on the inside.
Once the screws are removed, you can remove the side panels. On most computers, they just slide off. Start with the left side panel (the side that once had the knobs), slide it towards the back of the computer. Now you can remove the left panel. Just like the other one, slide it towards the back of the computer.
Please refer to the pictures if you are confused!
Step 3: Outer Shell/Casing (cont.)
In the last step I removed both side panels. In this step, I will be removing the front and top panels.
________________________________________
Wait For Next Part...
this presentation describes the concept of growth and development of plants in details. it explains different types and phases of growth. it also contain notes on growth rate that ie arithmetic & geometric. Growth curve and growth requirements are also well explained in this ppt. it also define differentiation, dedifferentiation and redifferentiation.
The outermost layer is termed as epiblema.
Cuticle and stomata are absent.
Cortex is formed of parenchymatous cells.
Endodermis is well developed.
Pericycle is distinct.
Vascular bundles are radial.
Xylem is exarch.
Phloem consists of sieve tubes, companion cells and phloem parenchyma. (In monocots however, the phloem parenchyma is absent).
GROWTH AND DEVELOPMENT
GROWTH
Refers to the irreversible (permanent) increase in size and mass of an organism.- Reproduction results in the formation of new organisms. Every newly produced organism is usually small in size, with time the organism increase in size and weight.- In multicellucar organisms the increase in size and weight is a result of the increase in the number and size of body cells. As the number of cells increases various organs are formed.- The changes can take place only if energy and raw materials are available. The energy and raw materials are derived from food. Because raw materials are used, growth brings about an increase in the mass of an organism.- In some multicellular organisms as new cells are formed some old cells usually die off. In such cases there is therefore a continuous addition and less of cells. But for growth to occur the rate of cell increase must exceed the rate of cell less.- When the rate of cell increase is higher than the rate of cell less growth is referred to as POSITIVE GROWTH.- When the rate of cell increase is lower than the rate at which cells are lost from the body, the organism decrease in size and weight. This is also growth and it is referred to as NEGATIVE GROWTH. It may be caused by an illness or starvation.- It should be noted however that negative growth cannot go on indefinitely. An organism cannot resume the size , weight and body shape of a newly born body. For this reason growth is said to be irreversible.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
Thinking of getting a dog? Be aware that breeds like Pit Bulls, Rottweilers, and German Shepherds can be loyal and dangerous. Proper training and socialization are crucial to preventing aggressive behaviors. Ensure safety by understanding their needs and always supervising interactions. Stay safe, and enjoy your furry friends!
it describes the bony anatomy including the femoral head , acetabulum, labrum . also discusses the capsule , ligaments . muscle that act on the hip joint and the range of motion are outlined. factors affecting hip joint stability and weight transmission through the joint are summarized.
This presentation includes basic of PCOS their pathology and treatment and also Ayurveda correlation of PCOS and Ayurvedic line of treatment mentioned in classics.
Delivering Micro-Credentials in Technical and Vocational Education and TrainingAG2 Design
Explore how micro-credentials are transforming Technical and Vocational Education and Training (TVET) with this comprehensive slide deck. Discover what micro-credentials are, their importance in TVET, the advantages they offer, and the insights from industry experts. Additionally, learn about the top software applications available for creating and managing micro-credentials. This presentation also includes valuable resources and a discussion on the future of these specialised certifications.
For more detailed information on delivering micro-credentials in TVET, visit this https://tvettrainer.com/delivering-micro-credentials-in-tvet/
This slide is special for master students (MIBS & MIFB) in UUM. Also useful for readers who are interested in the topic of contemporary Islamic banking.
How to Add Chatter in the odoo 17 ERP ModuleCeline George
In Odoo, the chatter is like a chat tool that helps you work together on records. You can leave notes and track things, making it easier to talk with your team and partners. Inside chatter, all communication history, activity, and changes will be displayed.
The simplified electron and muon model, Oscillating Spacetime: The Foundation...RitikBhardwaj56
Discover the Simplified Electron and Muon Model: A New Wave-Based Approach to Understanding Particles delves into a groundbreaking theory that presents electrons and muons as rotating soliton waves within oscillating spacetime. Geared towards students, researchers, and science buffs, this book breaks down complex ideas into simple explanations. It covers topics such as electron waves, temporal dynamics, and the implications of this model on particle physics. With clear illustrations and easy-to-follow explanations, readers will gain a new outlook on the universe's fundamental nature.
2. A series of changes in the life of an organism
–from zygote to adult – involves two major
processes:
(i) Growth
(ii) Development
Growth Phases
Introduction
3. Any irreversible and permanent increase in
quantitative parameters that can be measured
such as:
Growth Phases
Definition of Growth
size
length
volume
height
number
of cells
dry
masscytoplasmic
mass
surface
area
4. Any qualitative change and involve cell
differentiation:
Growth Phases
Definition of Development
shape
specificity
complexity
6. Growth Phases
1. Cell Division
• mitotic cell division in all somatic cells
• Through mitosis, the number of cells increase
exponentially – 1-2-4-8-16-32
7. Growth Phases
1. Cell Division
Plants – occurs in apical meristem (Root tip/shoot tip)
• Cells small, closely arranged, large nucleus
• Thin cell wall, no vacuole, dense cytoplasm
8. Growth Phases
2. Cell Elongation
Plants - cells elongate & expand due to:Plants - cells elongate & expand due to:
-- absorption of water, into the cells by osmosis,, into the cells by osmosis,
- vacuoles increase in size- vacuoles increase in size
- small vacuoles fuse to form a large central vacuole- small vacuoles fuse to form a large central vacuole
9. Growth Phases
3. Cell Differentiation
• the cell
undergoes change
in shape
in order to
perform specialized
functions - same set of
genetic information to
produce a diversity of cell
types
10. • e.g. : meristematic vascular cells
• the meristematic cells differentiate into:
xylem: transportation of
water and minerals
phloem: transportation of
products of photosynthesis and
hormones
Growth Phases
3. Cell Differentiation
11. GROWTH OF CELLS
CELL DIFFERENTIATION
Guard cell
and stomata
Mesophyll
cell
phloem xylem Parencymatous
cell of cortex
12. Growth Phases
Plants – In Root Tip
Three phases / zones:
1. Cell divisions
2. Cell elongation
3. Cell differentiation
13. THE GROWTH ZONE IN A PLANT SHOOT
Zone of cell division/
growth zone
Zone of cell
elongation
Zone of cell
differentiation
Matured tissue
Leaf
primordium
xylem
phloem
cambium
Apical meristem
-produces leaf primordium
which protects the
meristematic tissue
Axial bud
-containing cells which are
capable to divide to form
side branches.
1. Cell divisions
2. Cell elongation
3. Cell differentiation
14.
15.
16.
17. • Surface area of a leave
can be determine by
draw the outline of the
leave at a graph paper
or square paper (1cm x
1cm) and count the
square inside the leave
outline
• What is the surface are
for the leave?
20 cm2
/ / /
/ / / / / /
/ / / / /
/ / / /
/ /
Measuring Growth
Surface Area
18. the more appropriate parameters for the
measurement of growth in multicellular
organisms are the weight or mass
Measuring Growth
• fresh mass/weight
• dry mass/weight
19. • Periodic linear measurementPeriodic linear measurement
Eg: Measuring height for human being –
the best way to measure the growth of an
individual
Measuring Growth
Estimate length/ height
20. • the mass of the organism in the normalnormal condition
Measuring Growth
Fresh Mass
The advantages
• easier and convenient to measure
• no need to destroy the specimen
• the same organism can be used for repeated
measurement
21. The disadvantages
• inaccurate and inconsistent
• because it is affected by the fluctuation of
the amount of water in the organism
Measuring Growth
Fresh Mass
( water ~ 70 - 90% wet mass )
22. • the mass of the organism after its water
content is fully eliminated
Measuring Growth
Dry Mass: Definition
• it implies the actual growthactual growth of the organism
23. 1. The specimen is destroyed…
Measuring Growth
Dry Mass: Methods
2. …then transferred into the oven at 110°C
to eliminate its water content.
3. Next, it is put inside a desiccator to
ensure the water is completely eliminated.
4. The dried specimen is weighed.
5. The above procedures are repeated until
a constant value is obtained.
24. Measuring Growth
Dry Mass
The advantages
• more accurate
• the amount of water in an organism is not
constant, i.e. depends on the water intake
by the individual organism
25. Measuring Growth
Dry Mass
The disadvantages
• destruction of specimens
• in repeated measurement, specimens of the
similar age, size are required (destroyed!) to
avoid or minimize errors in the measurement
• Large samples of genetically identical organism
need to be grown under similar condition
• Time consuming
26. If an organism’s measurements (height,
weight, etc) are plotted against time, a
growth curve is obtained.
GROWTH
CURVE
28. GROWTH STAGES
1. Lag phase:
(a)The beginning of the growth process
(b)The rate of growth is generally low
(c)Cell division by mitosis takes place
very actively but there is no increase in cell size.
2. Exponential Growth:
a) The highest growth rate
b) Increase in the number of cells by mitosis
c) Cell size increases by absorbing water and addition of
protoplasmic substances.
29. 3. Maturity Stage
a) Growth rate is low
b) Cells achieve the optimum size(adult)
and there is no more increase in size of
the cell.
a) A little cell division to replace damaged cells
4. Stationary (Adult) Stage
a) Growth rate is zero
b) Cells still divide to replace damaged / dead cells
5. Senescence Stage
a) Growth rate is negative because of loss of tissues due to aging
process
33. GROWTH CURVE OF A HUMAN
Time / year
Growth ( height/
weight)
At birth
Rapid growth
Slow growth
Very rapid growth
Very little
growth death
senescence
adult /Adolescence /
childhood
baby
34. GROWTH OF A BOY AND A GIRL
Rate of increase in height Kadar pertambahan berat
Age /
years
Height/cm
boy
girl
Freshweight
Rate of increase in weight
boy
girl
Age /
years
43. Meristem
Actively dividing tissue.
• Apical meristem: These are found at the
tips of roots and shoots and are
responsible for primary growth of the
plant. They increase its length.
• Lateral meristem:
• Cambium & Cork Cambium
• They are responsible for secondary
growth and cause an increase in girth
44. Primary & Secondary Growth
• All plants exhibit primary growth
• Woody plants also undergo secondary
growth (increase in girth wood)
• Herbaceous plants do not undergo
secondary growth
45. Primary Growth
• Primary growth leads to an increase in length
of the plant shoots or roots.
• It is due to the activity of apical meristems.
http://www.ucalgary.ca/~biolcore/biol233/plant5/apicalm
agon.seowon.ac.kr/~bioedu/bio/ohp/t-188.jpg
Root apical meristem (RAM)
Shoot apical meristem (SAM)
46. THE GROWTH ZONE IN A PLANT SHOOT
Zone of cell division/
growth zone
Zone of cell
elongation
Zone of cell
differentiation
Matured tissue
Leaf
primordium
xylem
phloem
cambium
Apical meristem
-produces leaf primordium
which protects the
meristematic tissue
Axial bud
-containing cells which are
capable to divide to form
side branches.
47. THE GROWTH ZONE IN A PLANT ROOT
Root hair
phloem
xylem
Matured tissue
Zone of cell division/
growth zone
Zone of cell
differentiation
Zone of cell elongation
cortex
Apical
Meristem
Root
cap
48. SECONDARY GROWTH IN
PLANTS
Secondary growth leads to the increase in thickness of a
plant. This is due to lateral meristems. (dicots only)
(perennial plants only)
50. Lateral meristem – vascular cambium & cork cambium
.Vascular cambium divides to form cambium ring.
.Cambium ring divides tangentially to form secondary xylem inside & secondary
hloem outside.
.Cork cambium divides to form cork outside.
.Lenticels develop to allow gaseous exchange between air & stem
.Primary xylem, phloem and pith are “squashed”. Epidermis ruptures.
51.
52.
53. Secondary Growth
Xylem
year 1
year 2
year 3
PithVascular
Cambium
Phloem
Cork
Cork Cambium
Note:
Xylem = wood
Cork, Cork cambium and
Phloem = bark
http://www.umanitoba.ca/faculties/science/biological_sciences/lab9/images/til
• Each year a new ring of xylem – produces a hard inner core
called wood
• Spring - fast growth – cells large, thin wall
• Autumn - slow growth – cells small , thick walls
• Light & dark rings – annual rings – calculate age of tree