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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.
What is Radioactivity ? Radioactivity : Some isotopes, called radioisotopes, have unstable nuclei that release high energy particles or radiant energy, or both. An example
Q. What is the relation between the concepts of chromosome and chromatin? Are heterochromatin and euchromatin part of chromosomes? Every filament of chromatin is a complete DNA
What is meant by concentration gradient? Is it correct to refer to "concentration gradient of water"? Concentration gradient is the difference of concentration of a substance
Q. Is the ventricle lumen larger during diastole or during systole? During diastole the opposite occurs. The muscle fibers of the ventricles relax and the lumen of these chambe
Q. Since neurotransmitters are not consumed in the synaptic process What are the mechanisms to reduce their concentrations in the synaptic cleft after they have been used?
Endosperm with Micropylar and Chalazal Haustoria Some plants develop haustoria from both micropylar and chalazal ends of endosperm. In Nemophila aggressive haustoria arise fr
What is the structure of the adult fern within which cells undergoing meiosis can be found? In these plants meiosis takes place within structures known as sorus (plural, sori),
Explain Cooperative behaviours of social animal group Group living, specialist roles, eg bees, ants Altruism, eg social insects, meerkats Group defence, eg social
Starch exists in plants as insoluble starch granules in chloroplasts. Each starch granule holds a combination of two polysaccharide forms, amylopectin and amylose.
Enzyme Specificity Enzymes play a critical role within biological systems through helping reactions to occur beneath the commonly mild conditions in that organisms live. Enzyme
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