Thursday, December 12, 2013

Cnidaria

Feeding:


  •  feed in several ways
  • predation on corals, absorbing dissolved organic chemicals, filtering food particles out of water, getting nutrients from algae with their cells
  • depend mostly on absorbing dissolved nutrients uses tentacles to capture food
  • tentacles have rows of cilia whose beating creates currents that flow towards the mouth


Respiration:


  • there are no respiratory organs and cells layers absorb oxygen and expel carbon dioxide into the water


Circulation: 

  • they lack a circulatory system because they do not need one
Excretion:
  • canal like cavity in they bodies for ingestion, digestion
  • gas is eliminated by diffusion
  • solid waste is dissolved 
Response/ Movement:

  • muscle surrounding cavity relaxes and contracts, causing it to move back and forth
  • as water moves in one direction, it moves in opposite way
Reproduction:

  • sexual and asexual
  • assexually with diffusion
  • sexually with the ova and sperm being released from the gonads and gastroderms

Sunday, December 8, 2013

Flower Dissection

PART ONE

 Labelling:



Ovary cut in half:
- looks like a tube like structure running up it



Pollen close up:
-look like little pumpkin seeds with a line running up the middle



PART TWO

-pollination is sexual reproduction in plants. It is how the pollen is transferred to the female egg.

-pollen, anther, stigma, ovule

-self fertilization occurs when the pollen from an anther fertilizes the eggs on the same flower

-cross-fertilization occurs when the pollen is transferred to the stigma of an entirely different plant

-this plant in an angiosperm because only angiosperms can bear fruits or flowers

Monocot or Dicot

I did the opposite of what I had in post #1 so I could compare them.
So for example, if I had a dicot leaf in my first post, I'll post a monocot leaf in this one.


Dicot Root
(does not have the "T" that the monocot root has)



Monocot Stem
(the little "skulls" are scattered throughout, whereas in the monocot stem it was along the edges)



Dicot Leaf
(vascular bundle seems smaller and the circles along the edge are smaller)