Show takhtajans system of classification, Biology

Assignment Help:

Q. Show Takhtajans System of Classification?

Another important phytogenetic system was proposed by Takhtajan, the famous Russian Palaeobotanist working at Komarov Botanical Institute, Leningrad, U.S.S.R. For the first time he proposed the system in 1942rnainly based o n the structural types of Gynoecium and placentation. Afterwards, he put forward a modified system in 1954 in Russian language and then the translated version of English in 1958. This modified system was mainly based on phylogenetic principles. Soon after he made another attempt to revise the system in the light of evolutionary trends in Angiosperms, which appeared in 1964. This, too, was not the last word but Takhtajan again revised and updated version of his system appeared in 1980.

Before we take into account the outline of the system it seems proper to point out the important and significant points of the system as new terms were employed by Takhtajan in his system:

i) Magnoliophyta (Angiosperms) are regarded to be monophyletic in origin.

ii ) Magnoliopsida (Dicots) are considered as a primitive group than Liliopsida (Monocots).

1) Mognoliophyta (Angiosperms) has 419 Families and is divided into 2 classes viz.

i) Magn,oliopsida (Dicots) and

ii) Liliopsida (Monocots)

2) Magnoliopsida (Dicots) is further divided into 7 subclasses, 20 super orders, 71 Orders and 342 Familes.


Related Discussions:- Show takhtajans system of classification

Synergistic and sequential effects of hormones, Synergistic and Sequential ...

Synergistic and Sequential Effects of Hormones In vitro studies on callus and suspension cultures have brought out two interesting findings. The nature and direction of differ

Requirements and recommended dietary allowances (rda), Define Requirements ...

Define Requirements and Recommended Dietary Allowances (RDA)? What do we mean by requirements and RDA? The requirement level is the amount of nutrient needed to be absorbed to

Pathophysiology of mitral stenosis, Q. Pathophysiology of mitral stenosis? ...

Q. Pathophysiology of mitral stenosis? Normally there is no pressure gradient between left atrium and the left ventricle during diastole. However, as the valve orifice size dec

Explain about bequest value of biodiversity, Q. Explain about Bequest value...

Q. Explain about Bequest value of biodiversity? Sometimes people derive satisfaction from the fact that conserved biodiversity may benefit other individuals in the future, givi

Venipuncture - blood collection, Venipuncture : patient shoul...

Venipuncture : patient should be seated or supine for at least 20 minutes before sampling. An arm with an inserted intravenous line should be avoided. The median cubi

How boron affect the the synthesis of proteins, How boron affect the the sy...

How boron affect the the synthesis of proteins ? Inadequate availability of boron tends to increase the loss of phosphorus from plant roots and also affects the synthesis of pro

Explain the intracellular perfusion fluid, At 1 AM, a healthy squid giant a...

At 1 AM, a healthy squid giant axon is placed in a bath of normal squid physiological extracellular saline and is internally perfused with normal squid intracellular saline.

Is phenoxyethanol harmful?, Phenoxyethanol is dangerous and can be absorbed...

Phenoxyethanol is dangerous and can be absorbed through the skin - official sites for toxicity data, though, show little toxicity in man and some toxicity (irritation) with high do

Amylase stock solution, Assume that you have 1 mL of a solution amylase (an...

Assume that you have 1 mL of a solution amylase (an enzyme) at a concentration of 15 mg protein/mL. Calculate the volume of diluting buffer that you would have to add to 1.0 mL of

Describe the several steps by allosteric inhibition, Which of the following...

Which of the following are features of allosteric inhibition? During the infection, there are many different environments that P. multocida will encounter. In order to cause an inf

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd