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Biology OYO

Biology OYO Module 12

QuestionAnswer
12.1 Suppose an arthropod lives in an ecosystem which contains no predators. The arthropod would never, ever be threatened. Would it need an exoskeleton in this situation? Yes, because the exoskeleton is also needed to support the arthropod's body.
12.2 If you count the cephalothorax as one body segment, how many major segments does an arthropod with a cephalothorax have? Two.
12.3 An organism moves its joints with muscles that lie on top of the joint. Is the organism an arthropod? No.
12.4 If an arthropod cannot taste something, but the rest of the nervous system is operational, what sensory organ is malfunctioning? Antennae.
12.5 Why do we say that arthropods are constantly bleeding internally? Their heart pumps blood into short vessels that empty out into different cavities of the body, allowing blood to flow right over all of the cells in that cavity.
12.6 Although the gills of a certain crayfish seem to be working fine, the crayfish suffocates because it cannot get fresh water into the gill chambers. What organs are not working properly? Swimmerets and maxillae.
12.7 Trace the flow of blood from the pericardial sinus and back again. Mention the following organs in your discussion: pericardial sinus, sternal sinus, green glands, heart, and gills. Blood collects in the pericardial sinus, and enters the heart. The heart pumps the blood to body cavities. The blood then goes to the sternal sinus, from which it passes through the gills, to the green gland, and finally back to the pericardial sinus.
12.8 A crayfish loses its claw in a fight. What happens? A membrane seals the resulting hole, keeping the blood in the body. Later, the crayfish can regenerate the missing appendage.
12.9 If a crayfish cannot stay upright in the water, what organ is most likely not working? The statocyst.
12.10 Most spiders have poison glands and produce poison that they inject into their prey. Does that mean that we must fear most spiders because they are poinsonous? No. The poison is usually very weak.
12.11 Where are the abdomen and cephalothorax in Figure 12.7? The abdomen is posterior to the pinched area and the cephalothorax is anterior to the pinched area.
12.12 An insect's outer wings are incredibly tough. Most likely, what kind of wings are they? Horny wings.
12.13 You can suffocate an insect by wrapping up its body, except for its head, in plastic wrap. Why, if the mouth is exposed to air, does the insect still suffocate? Because the air circulates through its body, and its body is covered up.
12.14 An insect cannot digest food in its stomach due to a lack of digestive enzymes. Which organ is most likely not working? The salivary glands.
12.15 An insect goes through a nymph stage in its development. Does it undergo complete for incomplete metamorphosis? Incomplete metamorphosis.
Created by: LiseBrinkley
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