Phylum Cndaria Flashcards
What is the outside layer and inside layer called for hydras?
Outer layer is called epirdermis and inner layer is gastroderm
What’s a nematocyst
Are organelles consists of a coiled, thread like stinger, it’s found within the cnidocyte cells
How does a hydra circulate
The products of digestion are distributed by diffusion from cell to cell
What is elimination in Cnidaria
Undigested wastes are eliminated from vacuoles into the GVC and out through the moutg
What happens during respiration
02 enters the cells by diffusion and is used by the cell for cellular respiration then carbon dioxide a waste product of cellular respiration leaves the cells by diffusion into surrounding water
What happens in excretion
Nitrogenous wastes leave the cells by diffusion into the GVC or to outside
What makes up the hydras nervous system
Have a nerve net that runs through the mesoglea. Hydra has sensory cells that are sensitive to touch, light and chemical changes
What type of muscles do hydra have?
Longitudinal and circular muscle fibres at the base of the ectodermal and endodermal layers
What type of skeleton do hydra have
A hydrostatic skeleton, this means the gvc fills with water, keeping them upright . The combination of the water and muscle contractions allows them to move
What type of asexual reproduction does hydra go through?
Budding: a bud forms by mitosis on the side of the hydra and then breaks off. Regeneration: hydra is able to re grow missing parts by mitosis
How does sexual reproduction occur in hydras
Ovaries grow on the side by the bottom and testes grow on the side by the tentacles, the zygote goes through cell division(mitosis) after fertilization occurs and will become an embryo which goes through gastrulation. It will form a collared larva called planula
What’s a polyp
Body form that remains attached to a surface. The polyp is generally responsible for asexual reproduction
What’s a polyp
Body form that remains attached to a surface. The polyp is generally responsible for asexual reproduction
What’s a Medusa?
Body form that is free swimming. Polymorphic species medusa is responsible for sexual reproduction
What happens in embryological development?
Two tissue layers form, meaning they are diploblasts. The two tissue layers are ectoderm and endoderm with mesoglea
