Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Two-Kingdom Classification
The history of taxonomy is as old as man himself. It may be traced back to prehistoric times because man had learnt to designate living organisms by specific names very early in his evolutionary history. Much before the advent of civilisation living things had been categorised into animals and plants. Hippocrates (460-370 BC), Aristotle (384-322 BC) and many others had tried to put some order into the chaos of the bewilderingly large number of different life forms. Aristotle appears to have been the first to attempt a logical system of classification. He classified animals on the basis of presence or absence of blood as Sanguineous (with blood) and Non-sanguineous (without blood). He believed that in evolution, life had been directed towards a perfect animal form, having blood (Table 1.6). He incorporated this idea which is a hierarchical system of classification In his book entitled 'Scala Naturae'. He also recognised two kingdoms in the living world i.e., Plantae and Animalia. The former included mainly immobile forms, while the latter embraced mobile forms. We also know that one of the major differences between the two is that the members of Kingdom Plantae are autotrophic and obtain their food mostly by photosynthetic means and those of Kingdom Animalia are heterotrophic and obtain their food by ingestion.
Table: Aristotle's 'Scale of life' or Scala Naturae.
Kingdom Plantae was later divided by biologists into two subkingdoms,
Kingdom Animalia, on the other hand, was divided into Subkingdoms Protozoa containing unicellular forms and Sub Kingdom Metazoa including sponges and other multicellular organisms. A third Sub Kingdom Parazoa was later created and the sponges were shifted to this Sub Kingdom due to their intermediate position. between uni and multicellular organisms.
Q What are the three structures shared by every chordate that characterize the group? All beings of the phylum Chordata have branchial clefts in the pharynx in some species pre
(a) What are the two main pollutants that contribute to acid rain? (b) Where do these pollutants come from? (c) What direct or indirect effect is 'acid rain
Q. Medical therapy for tricuspid stenosis? Medical therapy is ineffective. With diuretics, symptoms of congestion are replaced by that of low cardiac output state. Occasional c
Implementation of Nursing Care Administration of Appropriate Drugs If the surgery is not necessary or if it is postponed for some time then diuretics and digoxin are
You are soon to be registered as a nurse and have applied to work in a unit where you will be caring for a diverse range of clients with medical and surgical complexities. You know
Q. What are the stages of mitosis? Mitosis involves replication of DNA and its separation into two new daughter cells. Whereas only four phases of mitosis are often listed. Ent
What is agamospermy? How is agamospermy dissimilar from parthenogenesis and parthenocarpy? i. How can haploid plants be increased in the laboratory? ii. Name the plant f
Define Assessment of Chromium Status? No specific tests are currently available, which could help us to determine chromium status. Another reason being the chromium content of
Q. What is the endocrine function of the placenta? The placenta is not a permanent gland of the endocrine system other than this it also has endocrinal function. The placenta p
This problem refers to the MN and ABO loci mentioned in class. It also refers to the Rh locus, which is responsible for the positive/negative part of the blood type. The Rh+ allele
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd