Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Name UNIT 10 Date HANDOUT ________ Per Arthropods Objectives: Observe the general characteristics of arthropods, explain how an arthropod is an animal, describe specialization in arthropods Directions: In your last activity you explored a phylum of animals called Porifera. Today you will observe arthropods, another type of animal. Reading Read pages 54-57 in your book and complete the information below. 1. Another phylum of the animal kingdom is arthropoda. An arthropod is an _____________ that has an _______________________, a _______________ body, and jointed attachments called ____________________. In addition, all arthropods have an ________ circulatory system, where blood leaves the vessels and bathes the internal organs. (Note: humans have a closed system: blood travels through vessels and never leaves the vessels.) 2. The external skeleton is called the _________________. The exoskeleton has several functions (list 2): __________________________________________________________. It is made of a material called ______________. As an arthropod grows larger, it must shed its exoskeleton through a process called ____________________. 3. (See pg. 246 in the Life Science book.) The bodies of arthropods are segmented, which means they are divided into sections. Most arthropods have 2-3 body sections. The three sections are: The _____________ contains the __________ organs. The middle section is called the _________________ and the ______________ ________ are attached here. And the last section is called the __________________ and contains the ______________ and _________________ organs. Some arthropods only have 2 body sections. They have an abdomen and a hybrid or fused section called the (pg. 257) _____________________. (This word means head-thorax.) 4. Arthropods also have appendages. There are several appendages: legs, wings, mouth parts, etc. Arthropod appendages tend to be highly ___________________ (hey, that’s a characteristic of animals!). One of the most noticeable appendages is found on the head of arthropods: ____________________. These are appendages on the head that contain sense organs. Some arthropods have one pair, others have two pairs, and some arthropods, like arachnids, don’t have any at all. 5. There are several subgroups of arthropods. The major groups are the ________________, _________________, _______________, __________________, and _______________. On to the back! UNIT 10 | HANDOUT | ARTHROPODS PAGE 1 Name Date Per 6. Each group is distinguished by a couple characteristics: number of body sections, number of legs, antennae, and some body features (like wings). Complete the table below to see how each group differs. Crustaceans Arachnids Insects Body Sections Num. of Legs Num. of Antennae 7. We will do more focused studies of insects and crustaceans. Continue below to learn more about arachnids and millipedes and centipedes. Use the Animals book (58-61). 8. Arachnids only have _______ body sections. All arachnids have ______ pairs of legs and do not have any _______________. They have a specialized breathing organs called _________ ______________. 9. There are four groups of arachnids: _____________, ___________, _____________ and _________________. 10.Spiders are unique from other arachnids in that they build (LS, 259) _________ to capture their food. It is important to note that not all spiders build webs. Some hunt down their prey. Spiders also have a pair of hallow (LS, 259) _______________ to inject poison. 11.Ticks are ________________ because they harm their host and are able to spread disease. 12.Scorpions are distinguishable by a spine-like ______________ found at the end of its abdomen. They also have claw-like pincers which do not count as pair of legs. 13.Another group of arthropods are the millipedes and centipedes. The primary difference between these organisms is the number of legs on each body segment. Centipedes only have _______ pair of legs on their body segments while millipedes have ______ pairs of legs on their body segments. In addition, centipedes are ______________, using their sharp jaws to capture their prey. This makes them _______________ because they feed on other animals, or meat. In contrast, millipedes are ________________ because they feed on plant material. UNIT 10 | HANDOUT | ARTHROPODS PAGE 2