Who knows Essay

Submitted By christinalove4444
Words: 1030
Pages: 5
Open Document
Tissues

Plant Life Duration

Duration: The life span of an individual plant

1) Herbaceous Plants

Annual
Plants live for a single growing season
Germinate, grow vegetatively, form flowers, and produce fruits and seeds

Biennial
Live for two years
Vegetative in the first year and produce flowers/fruits/seeds in the second year

Perennial
Live for three or more years
Flower and fruit every year once the plant has reached maturity

2) Woody Plants: always perennial

Shrubs
Have multiple woody stems

Trees
Have mainly one single woody stem
Trunk

Lianas
Are woody but can not sustain themselves
Need a physical support usually from other plants, rocks, buildings, etc
A vine is not a liana, vines are herbaceous where as lianas are woody

Extremes and Special Cases

Ephemeral
Only live for a couple of weeks
They do everything in this time such as germination, flower, reproduce, etc.
Annual plants

Extremely Longevive
These plants live for thousands of years
Monocarpy
Monocarpic plants are perennial
Produce flowers and fruits only one time and then they die
Agave spp.

Tissues: Classification

1) Meristems

Responsible for plant growth and development which come from mitotic cell division
Meristematic cells are the least differential cells
Small and tightly packed, no intracellular space
Thin cell wall
Dense protoplasm
Small vacuoles
Lack differential plastids (chloroplasts and chromoplasts)
Acorn to a massive tree

Meristem Classification

Based on their origin

Based on their position in plant
Lateral Meristems

Secondary Meristems
Growth in thickness
Vascular and Cork cambium form from the differentiation of primary cell tissue

Vascular cambium  secondary xylem inwards, secondary phloem outwards
Cork cambium  periderm (bark)

Why don’t plants develop cancer?
Plant tumors are very rare and are not as lethal as in animals because in plants it much more difficult for cells to escape tissue/organism controls
Plants are masters of mitosis!

Each cell has the potential to reproduce the entire plant organism

2) Parenchyma

Regular Storage Chlorenchyma Aerenchyma
Most common and abundant tissue
Primary or secondary origin
Consists of living cells
Various roles: storage of food, air, water, photosynthesis, etc. depending on the position of the plant or the ecology of that particular plant

3) Collenchyma

Supporting function
Living tissue that originates from parenchyma cells
Often found in the ribs of stems
Provides elasticity (herbaceous stems or leaves do not break when the wind blows)

4) Sclerenchyma

Mechanical function
Dead tissue
More specialized and diverse than collenchyma
Primary walls become very think with lignin, cells are dead of maturity
Primary or secondary origin
Sclereids: length and width are more or less equal
Fibers: Length much much longer than width, can be present in the roots, stems, and leaves

5) Xylem

Conducts raw sap – water and minerals – from the roots to the leaves
Treachery elements: dead, elongated cells with cell wall thickened with lignin
Still capable to fulfill their role of conducting water and minerals absorbed by the roots
Tracheids are primitive; thinner and longer
Vessel members are more evolved; shorter and wider

6) Phloem

Can have a primary or secondary origin
Transport sugars and other organic materials that resulted from photosynthesis, from the leaves to the rest of the plant
Sieve tubes are living, but nucleus disintegrates, so they require companion cells to function
Sieve tubes are long and connected by sieve plates

Most often Xylem and Phloem and associated in bundles

7) Epidermis

Always a primary tissue
Produced by primary meristem
Exterior of all organs
Normally one thick layer with the
Show More

Related Documents: Who knows Essay

Who knows Essay

Unlike the jaded Mr. Raymond, Jem is not without hope: Atticus tells Scout that Jem simply needs time to process what he has learned. The strong presence of Atticus in Jem’s life seems to promise that he will recover his equilibrium. Later in his life, Jem is able to see that Boo Radley’s unexpected aid indicates there is good in people. Even before the end of the novel, Jem shows signs of having learned a positive lesson from the trial; for instance, at the beginning of Chapter 25, he refuses to…

Words 502 - Pages 3

Essay about Everyone Who Plays Basketball Knows It

I Believe Everyone who takes basketball seriously knows it’s more than a sport, more than just an interest and more than just a desire that people have. Many people love the game because of how it makes them feel and the happiness associated with participating. Blood, sweat, and tears are just the small things that someone experience while playing the game. The attitude and feelings associated with the game makes it my preferred sport. The skills and techniques learned while on the hardwood has…

Words 495 - Pages 2

Essay on Who Knows and Learning How to Let Go

“Who Knows?” and Learning to Let Go Haunting and bizarre, Guy de Maupassant’s “Who Knows?” is often seen as a classic ghost story. However, behind the facade of the supernatural events, it is a tale of a man finding himself. In “Who Knows?”, the narrator is haunted by his past relationship and is fearful of new friendship, which leads to his seclusion. Later, he retires from solitude and succeeds in finding himself by immersing in other cultures through traveling. In the end, however, the traveling…

Words 1854 - Pages 8

never measure your life by people who dont know God Essay

Never measure your life by people who don’t know Christ. When I prepared to write this to you I was a bit dismayed because of some personal issues I was facing and needed a word from the Lord. Have you ever wondered I mean just sometimes why you the child of the king need go through so much while others who could care less about the Most High seem to be on easy street or even the hypocrites those who are saved on Sunday and hellish on Monday get away with so much? Psalm 73:2-3 reads like this:…

Words 380 - Pages 2

Working for an Assemblymember Essay

understand the uniqueness of every situation and know what the Assemblymember most important issues are that day 3) Be a good gatekeeper a. The Assemblymembers time is extremely limited, it must be used wisely. Know who and what is important and what isn’t. 4) Make the Assemblymember looks good at all times a. Know who is around, know what the Assemblymember doesn’t know, know when to step in with information 5) Setting up local events a. Know how to coordinate events in the district and the…

Words 439 - Pages 2

compare and contrast Essay

give blessings to those who are being affected. Also, some singers will write charity songs in order to appeal for more people to help those in need. Two charity songs will be compared and contrasted. The first song is “Do They Know It’s Christmas” written by Bob Geldof and Midge Ure in 1984 to raise money for the relief of the 1983–1985 famine in Ethiopia (Wikipedia, 2012). Geldof put together a group called Band Aid, consisting of leading British and Irish musicians who were among the most popular…

Words 913 - Pages 4

Second Amendment Importance

completely different political views which would leave the majority of the country upset. It is also important for the people to know who their vice president may be before the polls are over. Pre-12th amendment people would have no idea as to who would even be their vice president, because everybody just ran for president. With the 12th amendment people are now able to know who the vice president would…

Words 254 - Pages 2

course building Essay

up this morning, He did. I didn’t deliver you and set you free, He did. I didn’t touch you and heal your body, He did. I didn’t blow on your finances and provide for you, He did. When you found yourself in an unexpected situation and you didn’t know what to do, I didn’t work a miracle in your life, He did. And so, when you decide that you’re going to put other things before the work of the church, when you decide that this thing and that thing is more important than your assignment, you forsake…

Words 2329 - Pages 10

Self-esteem and People Essay

Name: Alexandra Title: Miss Douglas County Bullying in school Kids who are bullied have a hard time standing up for themselves. Bullying is a big issue that is not only important in this community but is a issue everywhere. You hear hear about it all the time, though what is actually being done? I intend to make people more aware of what is going on and how we can help to prevent it. Help the kids that are being…

Words 576 - Pages 3

Sign Language Gap Analysis

Language gaps can be difficult, especially between two people who use two separate forms of communication. “ASL is the language of a sizeable minority” (Harrington, 2004, para. 3). “Based upon this old survey (part of a project known as the National Census of the Deaf Population [NCDP]), we first estimated there may have been 500,000 persons who signed at home in 1972 (about 0.24% of the population),…” (Mitchell, 2005, para. 18). “is the fourth most used language in the United States today” (Harrington…

Words 439 - Pages 2