Skip to main content

PLANT VARIETY-HORSETAIL,CLUBMOSSES,AND FERNS.

HORSETAIL,CLUBMOSSES,AND  FERNS  are    primitive  land  plants,  which  ,like  higher  plants ,  have  stems,roots,and  leaves,and vascular  system  that   transport   water, mineral   and  food .
However  ,  unlike  higher  plants  ,they  do  not  produce   seeds .when  reproducing .There    life-cycle  involves  two  stages . In  stage  one , the   saprophyte (green plant) produces  spores   in   sporangla. In  stage    two  ,  the  spores   germinate , developing  into  a   small  short lived    gametophyte   plants  that  produce  male  and female  gametes ,  the  gametes   fuse  to   form  a  zygote. from   which  a  new  sporophyte   plant  develops .
Horsetail  (phylum -  sphenophyta )have  erect  green  stems  with  branches   arranged  in  whorls  ; some  stem  are  fertile  and  have  a  single   spore producing   strobilus (group  of  sporangia) at  the  tip.Clubmosses   (phylum   Lycopodophyta)  typically  have  small  leaves    arranged    spirally    around   the  stem ,  with   spores  producing  strobili  at  the  tip  of   some  stems .
Ferns  (phylum Filicinophyta)   typically    have  large  pinnate   fronds(leaves);sporangia  ,   grouped  together   in   sori , develop   on  the  underside   of  fertile  fronds.



Comments

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 ...

THE KING OF POP- MICHAEL JACKSON

Michael Joseph Jackson (August 29, 1958 – June 25, 2009) was an American singer, songwriter, and dancer. Dubbed the "King of Pop", he is regarded as one of the most significant cultural figures of the 20th century and one of the greatest entertainers in the history of music.   Michael Jackson is born. Pop sensation Michael Jackson is born on August 29, 1958, in Gary, Indiana. Jackson began performing with his four brothers in the pop group the Jackson 5 when he was a child. ... Jackson released several solo albums in the '70s, but his great breakthrough came in 1979 with Off the Wall.   Known as the "King of Pop," Michael Joseph Jackson was a best-selling American singer, songwriter and dancer. As a child, Jackson became the lead singer of his family's popular Motown group, the Jackson 5.   As a child, Jackson became the lead singer of his family's popular Motown group, the Jackson 5. He went on to a solo career of astonishing w...

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 mode...