Skip to main content

PARTS OF PLANT -STEM

THE   STEM  IS  THE  MAIN  SUPPORTIVE   PART  OF   A  PLANT.  that  grow  above  the  ground .Stem  bear   leaves  (organs  of  photosynthesis ),  which  grow   at  nodes,buds (shots  covered  by  protective   scales), which grow  at  the  stem  tip.9apical  or  terminal   buds) and  in  the  angle   between   a  leaf  and  a  stem (axillary  and  lateral  buds);and  flowers  (reproductive  structures).The  stem   forms   part  of  plant's   transport  system :xylem  tissue   in  the  stem  transports  water   and  minerals  from  the roots to the  aerial   part  of  the  plant ,  and  phloem  tissue transport   nutrients   manufactured     in  the  leaves  to  other part  of  the  plant . Stem tissues   are  also  used  to  store   water  and  food . Herbaceous  (non  woody ) stems  have  an  outer  protective  epidermis  covering a cortex    that  consist   mainly  of parenchyma (packing tissue) but  also   has  some  collenchyma (strengthening tissue).Woody  stems  have  an    outer  protective  layer   of tough   bark  ,  which  is  perforated  with  lenticels (pores) to  allow   gas  exchange .Inside  the  bark  is  a   ring   of  secondary  phloem , which  surrounds   an   inner  core  of   secondary  xylem.

Comments

Post a Comment

Popular posts from this blog

KEY BOARD SHORT CUTS

While   surfing  the Web,  these commands  could  help  you  and  are absolutely worth learning. By making repetitive motions faster, web surfing becomes so easy  and    pleasant! The following shortcuts can  be   work with desktop versions of Chrome, Firefox, and IE. CTRL-T to launch a new browser tab page. Tabbed pages are very useful: they let you open multiple web pages simultaneously without the same memory load as a full browser window.  Simply press CTRL-T to launch a new tab. Related: use CTRL-Page Up and CTRL-Page Down to navigate between the tabs.  CTRL-Enter to type 'www.' and '.com' Once you ...
Post a Comment
Read more

THE BEATLES -ENGLISH ROCK BAND

The Beatles were an English rock band formed in Liverpool in 1960. The group, whose best-known lineup comprised John Lennon, Paul McCartney, George Harrison and Ringo Starr, are regarded as the most influential band of all time.   The Beatles    were  from    Liverpool, United Kingdom.   In September of 1962 The Beatles recorded their first hit Love Me Do, which charted in UK, and reached the top of the US singles chart. London became their new home since 1963. ... Their October 1963 performance at the London Palladium made them famous in Great Britain and initiated the Beatlemania in the UK.   The most popular Beatle.   Paul McCartney ranked highest, at 35 percent; following by John Lennon (29%), Ringo Starr (11%), and George Harrison (8%). However, there is a gender gap: men favored John, while women preferred Paul.   The Beatles' first record "Love Me Do" was released on October 5, 1962. It was a moderat...
1 comment
Read more

WEB SEARCH TERMS

  When you decide to keep a Web page to look at later, you're doing something called "bookmarking". Bookmarks are simply links to sites that you visit frequently or want to keep handy for reference. There are a couple ways you can save Web pages for later: In your browser.  All major Web browsers provide you with the ability to make and store your favorite links within the browser. These links are accessible several different ways, depending on what browser you might be using: a sidebar, a toolbar, or a drop-down menu. In a social bookmarking site.  If you want to access your collection from anywhere and share them with others, then a social marking site - a site that lets you store your favourites links - might be for you. launch I n the context of the Web, the term launch usually means two different things. Permission to Launch - Website First, some Web sites use the word "launch" as a substitute for the more commonly known "enter" command. For ...
Post a Comment
Read more