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

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

What are the use of a barrier membrane is grafting procedure, What are the ...

What are the uses of a barrier membrane is grafting procedures? Uses of barrier membrane in grafting procedures : i) Help in stabilizing the graft ii) Prevents ingrowth

Regulation of senescence, Regulation of Senescence Senescence is a par...

Regulation of Senescence Senescence is a part of a developmental sequence of events and has to be a controlled process. You must have seen that if you cut twigs having leaves

What are the three main types of passive transport, What are the three main...

What are the three main types of passive transport? The three main kinds of passive transport are a)  simple diffusion, b)  osmosis and c)  Facilitated diffusion. C

Does every amino acid have a central carbon, Does every amino acid have a c...

Does every amino acid have a central carbon? To which organic group is that central carbon bound? A carboxyl group -COOH, an amine group - NH 2 , an atom of hydrogen -H and a v

Stentless devices -biological valves, Stentless Devices : A bioprosthesis...

Stentless Devices : A bioprosthesis mounted on a stent reduces the effective orifice area (EOA). The newer version (third generation) stentless gluteraldehyde preserved porcine v

What are the main intraspecific ecological interactions, What are the main ...

What are the main intraspecific ecological interactions? The main harmonious intraspecific ecological interactions are colonies and societies. The major inharmonious intraspeci

Excretion in animals, Excretion in Animals Excretion is concerned alon...

Excretion in Animals Excretion is concerned along with the removal of metabolic wastes that arise as a result of oxidation of energy rich compounds and metabolism of proteins

Similarities in body parts often indicate shared ancestry, Similarities in ...

Similarities in body parts often indicate shared ancestry. Which of the following is true? Structures used for different purposes in different groups can be controlled by the same

Complications of short bowel syndrome, Q. Complications of short bowel synd...

Q. Complications of short bowel syndrome? Complications of short bowel syndrome are generally related to malnutrition. What are the complications of malnutrition? A person with

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