Volvox PPT BY :- Dr.Pinky Diwedi

1. B.Sc.Iyear,paper-I,unit-II
Dr. Pinky Dwivedi
A.P. Botany, Govt. Madhav Science
College, Ujjain

2. Chlorophyceae
Volvocales
Volvocaceae
Volvox
Chlorophyceae-green, chl.a,b.,carotenoides,
xanthophyll.
starch-reserve food
unicellular to multicellular
motile gametes
mostly fresh water

3.  Volvocales – Green, microscopic, motile
unicellular,, colonial(coenobium),
fresh water
 Volvocaceae – colonial , coenobial, motile,
asexual reproduction –
daughter colonies

4. VOLVOX rolling alga
Fresh water
Green round ball in spring and rainy season
Fresh water- ponds, pools , ditches
Worldwide occurrence
Colonial – cells united by gelatinous matrix
Coenobium – green balls 0.5 – 2 mm dia.
Size and shape constant for a species
500 – 50,000 cells per coenobium

5.  Volvox coenobium

6.  V.aureus – 500-3000 cells
 V globators – 20000 cells

7. Colony – functional specialisation
Anterior part – vegetative
Posterior part - reproductive

8. REPRODUCTION/ LIFE CYCLE
Asexual and sexual
Asexual – Favourable conditions

10. Sexual – oogamous
V. globator– monoecious protandrous
V.aureus – dioecious
Male – antheridia- antherozoids
Female – oogonia- egg