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Define Class – Arachnida?The class Arachnida (Arachnida = spider) has terrestrial and few aquatic animals. It includes spider, scorpions and mites.1. Prosoma bears. six pair of appendages: one pair of clielicerae, one pair of pedipalpi and four pairs of walking legs. 2. Abdomen is generally devoid of appendages. 3. Respiratory organs are tracheae, book lungs and book gills. 4. Excretion is performed by malpighian tubules and coxal glands. 5. Sexes are separate but sexual dimorphism is not conspicuous.So, you have refreshed your background knowledge of1.he characters of subphylum Chelicerata and class Arachnida. Let us now study individuals examples under the class Arachnida.
Amphibian frog embryo
V apour Theory (i) It was proposed by a Greek philosopher Pythagoras in 500 B.C. (ii) Each organ of an animal body emitted some kind of vapour and that a ne
Q. Periapical radiography - criteria for endosteal implants? Periapical radiographs are images of a limited region of the mandibular or maxillary alveolus. Periapical radiogra
Concerning permeability what type of membrane is the cell membrane? The cell membrane is a selectively permeable membrane, i.e., it permits the passage of water and some select
Augmentation Therapy: The functional gene is introduced in addition to the defective gene endogeneous to the cell(s) in this somatic cell gene therapy, i.e. the improved cell
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What are examples of nematodes? Ascaris, hookworm and filaria, all parasites of humans, are instance of nematodes (also called as roundworms).
Q. What is extracellular digestion? Extracellular digestion is so that in which food breaking into utile molecules that can be internalized by the cell is done in the extracell
ENDOCRINE GLANDS OF AN INSECT - The endocrine glands of cockroach are as follows. 1. Intercerebral gland cells. These cells lie in the brain. They secrete brain horm
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