Microsoft Word - EXA1_ XXXXXXXXXXdocxShort essay questionsAnswer ONLY FOUR QUESTIONS of your choice...

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Microsoft Word - EXA1_ XXXXXXXXXXdocxShort essay questionsAnswer ONLY FOUR QUESTIONS of your choice (number your answers)For each question, you must write YOUR ANSWER IN YOUR OWN WORDS, using 250 +/- 50 words  (double space). You must give thorough explanations. You must cite all sources used other than the  equired textbook and list them in a bibliography.  2QUESTIONS1. Describe the external morphological characteristics that distinguish arthropods from other animals. Which ones distinguish insects from other arthropods?  2. The exterior of an adult insect’s body looks rigid and completely closed. Then, how can they so easily move around or move the different parts of their body, how do they know what is happening in their environment, and how do they eat and eathe?  3. Explain what the main differences between an insect’s circulatory system and our own circulatory system are. Can insects bleed and how do all their organs and tissues get their oxygen?  4. Just like other animals like us, chemical messengers are very important in insects. What are those messengers and their main functions? Which ones are particularly highly developed in insects as opposed to animals like us and why are they so important?  5. Discuss the consequences for an insect larva to grow through additional instars to reach a larger final ody size prior to pupation. Is the number of larval instars always fixed?

Sumita Mitra · Accepted Answer

Assignment		5
Answer 1:
An arthropod can be classified as an animal which are invertebrates with segmented body with an exoskeleton and has jointed appendages. An arthropod can be terrestrial, aerial or even aquatic in nature with a cavity inside the body filled with either blood or haemolymph. Ants, bees, dragon flies happen to be the examples of arthropods. The morphological characteristics of these group of animals includes some distinct features which separates them from other animals or groups. Arthropods have jointed appendages or legs and help them to perform work functions similar to jaws, legs for walking, gills etc. like other animals. Their external exoskeleton is made up of chitinous constituents. They shed their external skeleton after regular intervals during their lifespan. Their body is distinctly divided into three segments mainly as head, thorax and abdomen. In the head they have got compound eyes for better vision and antennas as sensory organ. Another visible feature of an arthropod which separates it from other animals is that they are bilaterally symmetrical in nature which means their body can be divided into two vertical mirror images.
Insects are also classified as arthropods but they differ from other arthropods because they      have six legs and has wings of two pairs at the most. Insects are the smaller sized arthropods. These distinctive features make the insects unique among all the arthropods. Insects are classified under the class insecta.
Answer 2:
Though the exterior body of the insects looks rigid and completely close but still they move and travel with the help of the muscles that connect the segments of their bodies with the exoskeleton. In this way they get the help from their muscles which lies interior to their skeleton for walking and movement. The muscular system of insects ranges from a few hundred muscles to a few thousand. The muscles are attached to their jointed limbs and other appendages for movement. In the insects underneath the hard shell of their bodies a pair of antagonistic muscles is attached across a joint in a way which could bend and straighten the limb.

Microsoft Word - EXA1_ XXXXXXXXXXdocx Short essay questions Answer ONLY FOUR QUESTIONS of your choice (number your answers) For each question, you must write YOUR ANSWER IN YOUR OWN WORDS, using 250...

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