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Heliozoans & Diatoms

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Daniella Longinetti

on 7 November 2013

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Transcript of Heliozoans & Diatoms

Heliozoa & Diatoms
By Daniella Longinetti and Caitlyn Bull

What is a Diatom?
A large component of plankton, DIATOMS are very common and easy to recognize using a microscope. They have very intricate designs.
What do diatoms eat?
Diatoms have chloroplasts which contain chlorophyll. The chlorophyll causes them to use energy from the sun to make food that they eat. Diatoms are also filter-feeders. As they move through water, they filter particles through their two silica shells as means of processing food.
Diatom Growth
What do heliozoa eat?

Heliozoa eat protozoans, algae, and other small organisms. They use their axopods to capture food.

What is a heliozoa?
Heliozoa are phagotrophs. They are roughly spherical amoeboids with many stiff, microtubule-supported projections called axopods radiating outward from the cell surface.
Comparing Diatoms and Heliozoa
Diatom Reproduction
These are Diatoms
Respiration
Respiration is a chemical reaction that happens within cells to release energy from food.
The seven characteristics of cells
Cells are the most important piece of life. These 7 characteristics are the building blocks of the cell life.
Sensitivity
The ability to detect change in the environment.
Excretion
Growth
Growth is seen in all living things. It involves using food to reproduce more cells. The permanent increase in cell number and size is called growth.
Cell reproduction is the process by which cells divide to form new cells. Each time a cell divides, it makes a copy of all of its chromosomes, which are tightly coiled strands of DNA, the genetic material that holds the instructions for all life, and sends an identical copy to the new cell that is created.
Growth in diatoms occurs undirectionally and results in a mean size reduction at each division.
Diatoms can reproduce in two different modes, sexual and asexual. Diatoms have a unique "shrinking division" mode of asexual reproduction. After cell division, the two valves separate. Each forms the epivalve of a daughter cell.
Excretion is the process by which waste products of metabolism and other non-useful materials are eliminated from an organism.
Diatom Excretion
Their silicate case, the frustule, has small pores for waste excretion and for nutrient uptake.
Heliozoa Growth
they grow until they reach a certain size and then the reproduce.
Reproduction
These are the way cells reproduce
Each cell is surrounded by a special cell membrane that acts as the cell's security gatekeeper. The cell membrane decides what goes into the cell and what should be kept out. Assimilation is the delicate process where nutrition has to pass through the cell membrane wall into the cell.

Nutrition
Heliozoa Reproduction
reproduce asexually by binary fission or by budding.
Full transcript