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

Determine the occurrence of biotin, Occurrence of Biotin Biotin occurs ...

Occurrence of Biotin Biotin occurs in nature very likely in all living cells, although usually in minute concentrations. In animal organs and in yeast, biotin is mainly cont

Pisces, weberian oscles found in

weberian oscles found in

Lungs - respiration, Lungs - Respiration Lungs can be simple, characte...

Lungs - Respiration Lungs can be simple, characterised by air exchange with surrounding environment by diffusion only. These are called the diffusion lungs and are present in

Acetylcholine, Acetylcholine is the chemical released at neuromuscular jun...

Acetylcholine is the chemical released at neuromuscular junctions which binds to receptors on the surface of the plasma membrane of the muscle cells, creating an electrical impuls

Define body building functions of proteins, Define Body Building functions ...

Define Body Building functions of proteins? The primary functions of proteins, as you might be aware, is tissue growth and maintenance. Protein contains amino acids - the build

What action is epa taking on plant-incorporated protectants, What action is...

What action is EPA taking on plant-incorporated protectants? EPA has issued three final rules clarifying and formalizing EPA's framework for federal oversight of plant-incorpor

Explain the pipettes - food microbiology, Explain the Pipettes - Food Micro...

Explain the Pipettes - Food Microbiology? Sterile glass pipettes or disposable pipettes can be used for transferring the known volume of liquid or culture aseptically. Steriliz

Viral diseases of domestic animals, Cattle and buffalo diseases Rinde...

Cattle and buffalo diseases Rinderpest: Rinderpest is the most destructive of the virus diseases of cloven-footed animals, viz. cattle, buffaloes, sheep, goats, pigs and wil

Lipids, Lipids All animal tissues contain lipids or fats as essential...

Lipids All animal tissues contain lipids or fats as essential components of cell membrane. It is also stored in certain tissues. Lipids are body's chief source of energy and

Define the prevention of adverse food reactions, Define the Prevention of A...

Define the Prevention of Adverse Food Reactions? Considering the increasing incidence, cost and morbidity associated with allergic reactions, it is perhaps useful to design pre

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