Their secretions are called hormones. Name two kinds of filaments of microfibrils. This is one of the reasons why a headless roach can live for more than a week. (c) Exocrine; endocrine; salivary gland; ligament An insect uses its digestive system to extract nutrients and other substances from the food it consumes. Answer: Answer: Answer: (i) Give the common name of Periplaneta Americana. What type of mouth parts are seen in cock-roach? Name the type of connective tissue that serves as a support framework for epithelium. Answer: Cilia help trap and clear dust foreign particles. (v) Where do you find Malphigian Tubules? There are 10 pairs of spiracles of which two pairs are located in the thorax and eight pairs in the abdomen. (i) What is the function of nephridia? Nervous system-Is involved in rapid transfer of short-term events and coordination of short-term events. Answer: (ii) How many types of nephridia are found in the earthworm, based on their location? Roaches' heads house their eyes, antennae and mouthparts. Sub oesophageal ganglia:- are a pair of ganglia the oesophagus. (b) Septal nephridium and pharyngeal nephrldium What is their shape? Fibres and fibroblasts are compactly packed in the dense connective tissues. For example, the antennal nerve carries many sensory fibres conveying inputs from the many antennal sensors to the brain, but it also contains some motor fibres carrying output signals to the muscles in the base of the antenna. Answer: There are nine segmental ganglia, of which three pairs are thoracic, six pairs in the abdomen i. e 1st five lie in the first five abdominal segments, the last is large & found farther behind. What are spiracles? For example, the antennal nerve carries, . Answer: Answer: What Is a nymph? The AL receives inputs from the third (terminal) antennal segment (the flagellum, which is, (singular glomerulus). What is pscudostratified epithelium? Answer: The head of cockroach holds a bit of a nervous system while the rest is situated along the ventral part of its body. This paralyzes the front legs of the cockroach. Most of this food is ingested in the form of macromolecules and other complex substances (such as proteins, polysaccharides, fats, nucleic acids, etc.) Hildebrand, 1989. Mention the function of the following. Their nuclei are located at the base. Neural adaptation is a change over time in the responsiveness of the sensory system to a constant stimulus. Excretion is performed by un malphigian tubules in cockroaches. 06, 07, 08, Koppala, Tumkur. Question 5. They absorb nitrogenous waste products and convert them into uric acid which is excreted out through the hindgut. Question 12. The hypopharynx lies on the floor of the buccal cavity. Earthworms lack specialised breathing devices. III. They act as depot of calcium and phosphorous. Septal nephridia: present on both sides of intersegmental septa of segment 15 to the last that open into intestine. Central Nervous System of Cockroach: The central nervous system consists of the supra-oesophageal ganglion or brain, sub- oesophageal ganglion and the nerve cord. Osteocytes. Question 11. A cockroach will respond to a tactile or wind stimulus directed at the body by rapidly turning away from the stimulus and running. The digestive system mainly consists of the foregut, midgut and hindgut. Striated muscles are present near articulatory joints. What are Malpighian tubules? 1st PUC Biology Structural Organisation in Animals One Mark Questions. Question 8. Three ganglia lie in the thorax, and six in the abdomen. (a) Ureters in frog circum – oesophageaÌ connectives and double ventral nerve cord (see figure). Prostomium is the front most part of the earthworm. They show alternate dark and light bands called striations. 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