Science 7 Chapter 12
Terms in this set (43)
Which phylum has the most animal species?
What kind of symmetry do flatworms have?
parts of sponges
spicules, collar cells, flagella
What characteristic distinguishes earthworms from worms in other phyla?
What does an octopus use to move quickly through the water?
tiny bristles that an earthworm uses for movement
clams obtain food by
filtering it from the water
What are eukaryotic, are consumers, and reproduce sexually?
exoskeletons and jointed appendages
Some insecticides work by clogging the insects' spiracles so the insects cannot
Insects have three pairs of
Organisms that have both male and female reproductive structures in the same body are called
Earthworms have blood that remains in the vessels as it circulates. This is called a
closed circulatory system
Earthworms carry on respiration through their
brown tube sponge
a type of skeleton similar to a water balloon
a stinging cell of a hydra or jellyfish
the resting stage of insect development
a tube that transports gases inside insects
an outer opening of an insect's gas exchange system
animal classified in phylum Arthropoda
animal with radial symmetry
animals that are invertebrates
sea star, honeybee, snail
animal that has tube feet in its water-vascular system
A collection of nerve tissue, called a "simple brain", is a
The chamber in an earthworm's digestive system that temporarily stores food is the
The chamber in an earthworm's digestive system that grinds food during mechanical digestion is the
Animals such as the clam that have two shells hinged together are called
An insect's life cycle, which includes changes in body form, is called
What structures control blood pressure in an earthworm?
What are the three body sections of an insect?
head, thorax, and abdomen
List the four stages of complete metamorphosis in order, beginning with the earliest stage.
egg, larva, pupa, adult
What is the key characteristic of sponges?
they have pores
Why are insects not crushed by their exoskeletons as insects grow larger?
Insects molt their exoskeletons periodically to allow for growth
Parasitic flatworms typically do not have cilia or other methods of movement. Why are they not necessary for these worms?
Parasitic flatworms obtain nourishment from their host. They do not have to move around to get food.
Tell which phylum each of the following organisms belong to: Portuguese man-of-war, trichina worm, spider. Then give at least one characteristic of each organism that places it in that phylum.
Portuguese man of war belongs to phylum Cnidaria - nematocysts. Trichina worm in phylum Nematoda - round but unsegmented body. Spider in phylum Arthropoda - exoskeleton, jointed appendages, and open circulatory system.
Describe several advantages and disadvantages of an exoskeleton.
An exoskeleton provides strong support and good protection for the organism. However, the weight of the exoskeleton limits how big the organism can grow, and it must be molted periodically. The exoskeleton also limits the animal's movements.
Invertebrates have very different ways of capturing and digesting food. Choose two different invertebrates, and contrast the ways in which they capture and digest food.
Sponges and clams are filter feeders, filtering their food from the water they live in. Jellyfish use nematocysts to capture food and then digest it in their gastrovascular cavities. Planarians use their long pharynx to suck food into their intestines, where digestion occurs; indigestible material is then expelled back through the mouth. Earthworms obtain food through their mouth and send it through the esophagus to the crop for storage; from there, food goes to the gizzard for mechanical digestion and the intestine for chemical digestion, and indigestible wastes are expelled through the anus.