kingdom protista

Question 1

brief about protista

Answer 1

-heterotrophic eukaryotes
-kingdom has no well defined boundries
-link between plant animal and fungi
-mainly aquatic
-well defined nucleus
-some have cilia or flagella
–reproduce sexually ad asexually by zygote formation and cell fusion

Question 2

devision of protista

Answer 2

devide into 5 - cgrysophytes, dinoflagellates, euglinoids,slime moulds, protozoans

Question 3

chrysophates

Answer 3

-desmids( golden algae , diatoms
-fresh water or marine
-float passively , microscopic-form plankton
most are photosynthetic
-diatoms:-cell wall-thin -overlap like soap box,
have silica embedded in the cell wall-diatomaceous earth-used to polish as filter
diatoms are main producers of the ocean.

Question 4

dinoflagellates

Answer 4

-marine
-photosynthetic
-yeow , green , brown , blue , red depending on the main pigment
-cell wall-thick cellulosic
-2 flagella - one longiudinally , one transversly in a furrow
-RED DINOFLAGELLATE - EX: GONULAX-rapid multipication -make sea appear red
-release toxins which may kill sea animals

Question 5

euglinoids

Answer 5

• fresh water-stagnent water
  -instead of cell wall - protein rich layer -pellical which makes body flexible
  -2 flagella -1 long 1 short
• photosynthetic in the presence of sunlight or heterotrophic (predate on small organisms) in the absence of sunlight.
  -PIGMENTS IDENTICLE TO HIGHER PLANTS
  -EX: euglena

Question 6

slime moulds

Answer 6

-saphrophytic protists
-body moves along decaying twigs and leaves engulfing organic matter
-form aggregation called-plasmodium -may grow upto several feet
differntiate and form fruiting bodies bearing spores at their tips
-spores-have true wall- extremely resistent survive harsh conditions
-spores -dispersed by air currents

Question 7

protozoans

Answer 7

• heterotrophes -predetore, parasites
  primitive relative of animals

-1) amoeboid protozoan : fresh water or aquatic or moist soil
-move and capture prey -pseudopodia
-some have silica in shell
-EX ; Ameoba,, entameoba (parasite )

(2)-flagellated protozoans : free living or parasitic
- have flagella
KNOWN TO CAUSE SLEEPING SICKNESS-TRYPANOSOMA

(3)ciliated protozoan - aquatic actively moving - have 1000s of cilia
cavity - gullet - opens to outside of cell surface
coordinat movement of cilia causes food in water to be steered into the gullet
-EX: PARAMECIUM

(4)-sporozoans-have onfectius spore like stage - most notorius -PLASMODIUM(malarial parasite)