How to prepare a key, Biology

Assignment Help:

Q. How to Prepare a Key?

Let us prepare a key by making a choice of. characters, listing significant and insignificant characters, tabulating these characters and forming dichotomies. List all the permanent morphological characters and write them in the same sequence on cards. Keep one card for each taxon. If we choose petiole as a character we have to write it at the same number in all the cards. 

289_How to Prepare a Key.png

From the table it. is clear that taxa I, I1 and I11 fall into one group and IV in another. On the basis of characters noted at 1,2 and 3. This is called Dichotomy. On the basis, of perianth character written at No. 4 again two groups are made, one of taxa I. and. I1 and other of taxa I11 and IV. Taxa I and I1 are further separated on the basis of character of petals, free versus connate. Now sort out all the cards into two groups and separate cards of each group into two or more sub groups till all the taxa are dealt with and all the cards are sorted out. All the characters on the basis of which cards are sorted into groups form the couplets of leads. Now print the key and write flower trirnerous and not trimerous flowers and leaves reticulate and not reticulate leaves. f size is a character then give range of measurements and do not use words like big, small large.


Related Discussions:- How to prepare a key

Initial and the final energy levels in catalyzed reactions, Q. Is there a d...

Q. Is there a difference between the initial and the final energy levels in non-catalyzed and catalyzed reactions? The catalysis does not modify the energetic state of reagents

State the method of recombination or crossing-over, Which of the following ...

Which of the following statement is false regarding the method of recombination or crossing-over? A. Crossing-over takes place during prophase I of meiosis B. Recombination

Determine how many family full-time family doctors, 1.  In the town of Jasp...

1.  In the town of Jasper, CA, there is currently one full-time family doctor. If the town's population grows at a steady rate of 14% per year, how many family full-time family doc

What is available soil nutrient, Availability of nutrients in soils  Th...

Availability of nutrients in soils  The productivity of a crop depends largely on the nutrients discussed in the previous section. It is important to find out methods which wil

Can you explain about cardiomyopathies, Q. Can you explain about Cardiomyop...

Q. Can you explain about Cardiomyopathies? Cardiomyopathy is a primary disorder of heart muscle that may cause cardiac dysfunction and is not related to any obvious disease pr

Assessment and management of aortic stenosis, Assessment   The severity...

Assessment   The severity of symptoms depend on degree of obstruction.  In case of severe obstruction,  ECG shows right ventricular or biventricular hypertrophy. Cardiac cathet

Define about the absorption of iron, Define about the Absorption of Iron? ...

Define about the Absorption of Iron? Before it can be absorbed, iron whether it is in the form of haem or non-haem must be released from the food matrices where it is bond with

Surveys - accidents in industries, Surveys - Accidents in Industries T...

Surveys - Accidents in Industries The surveys done in industries have pointed out that leading cause of accidents is the overexertion or workers working beyond their physical

O-linked oligosaccharides , Most proteins made by ribosomes on the RER (rou...

Most proteins made by ribosomes on the RER (rough endoplasmic reticulum) are glycoproteins, which is they hold short chains of carbohydrates (oligosaccharides) covalently related t

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