The document compares and contrasts plant and animal cells. It notes that plant cells have a cell wall made of cellulose surrounding the cell membrane that animal cells lack. The cell wall provides structure and allows exchange of materials between plant cells. It also describes chloroplasts, which contain chlorophyll and allow plants to perform photosynthesis, converting sunlight into sugars. Other plastids like chromoplasts and leucoplasts store pigments or starches. Plant cells contain a central vacuole for storage of water, sugars, and minerals used by the cell.
The document compares and contrasts plant and animal cells. It notes that plant cells have a cell wall made of cellulose surrounding the cell membrane that animal cells lack. The cell wall provides structure and allows exchange of materials between plant cells. It also describes chloroplasts, which contain chlorophyll and allow plants to perform photosynthesis, converting sunlight into sugars. Other plastids like chromoplasts and leucoplasts store pigments or starches. Plant cells contain a central vacuole for storage of water, sugars, and minerals used by the cell.
The document discusses the giant cuttlefish species found along the coast of South Australia. It is the world's largest cuttlefish and can grow up to 50cm long and weigh over 10.5kg. It lives in caves and crevices along the coast and is curious around divers, often following those with bright colors. The population has declined 57% between 2001-2008 due to fishing in the area.
2. Koren je biljni organ koji se nalazi u zemlji I upija mineralne materije I
vodu.
Koren se razvio kao biljni organ kada su prve biljke naselile kopno.
Uslovi zivota na kopnu su se znatno razlikovali od uslova za zivot u
vodi,pa je bilo neophodno da se razvije organ,koji bi biljkama
obezbedjivao vodu I mineralne materije I pricrscivao ih za podlogu.
3. • Koren biljaka cvetnica se razvija iz korenka klica.Klica je zacetak nove
biljke cvetnice.Deo korena sa kapom је korenska kapa ciji povrsinski
• sloj grade mrtve,osluznjavele celije koje se ljuste I tako smanjuju
trenje pri sloju korena. Celije korenske kape se stalno obnavljaju
deobama celija vegetacione kupe i istovremeno koren tim deobama
raste.
4. GRADJA KORENA
• Na korenu paradajza razlikuje se glavni,deblji koren od bocnog,
slabije razvijenog korena.Skup svih korenova jedne biljke
naziva se korenov sistem.
• Na uzduznom preseku korena,uocava se celijska gradja korena.
• Celija korena se medjusobno razlikuju po obliku jer obavljaju
razlicite zadatke…
6. • Korenske dlacice se nalaze na povrsini dela korena koji je blizi
stablu.
• Boda i mineralne materije koje udju u korenske dlacice putiju
do tankih provodnih snopica.
• U vrhu korena se odvija deoba celija.Broj celija u vrhu se
povecava I koren raste u dubinu.
• Celije korenove kape se nalaze oko vrha korena.one stite celije
vrha korena od ostecenja.
7. OBLICI KORENA
• U zavisnosti os uloge koju ima,kvaliteta zemljista na kome raste
I vrste biljke ,koren moze imati nekoliko razlicitih oblika
1. Osovinski koren
2. Zilicasti koren
3. Vretenast koren
4. Repast koren
