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

How do the golgi apparatus act, Q. How do the Golgi apparatus act and the r...

Q. How do the Golgi apparatus act and the rough endoplasmic reticulum in the production and releasing of proteins? The rough endoplasmic reticulum has in its outer membrane man

Explain phylum phytofagellata, Phylum Phytofagellata (Plant flagellates...

Phylum Phytofagellata (Plant flagellates) 1) At some stage of life cycle they have one or more flagella. The flagella are used for locomotion. 2) Photosynthetic protistan

What happen when auxin concentration in plant is over, What happens when au...

What happens when auxin concentration in some structures of the plant is over the action range of the hormone? In some of parts of the plant (roots, stem, lateral buds) there a

Classification of biomaterials, Biomaterial is defined, in the broader sens...

Biomaterial is defined, in the broader sense, as any pharmacologically inert material that is capable of interacting with a living organism without causing adverse reactions either

Consider the evolution of metabolic pathways, Consider the evolution of met...

Consider the evolution of metabolic pathways. Some biologists believe that these pathways evolved from?

Feline leukemia, Feline leukemia The disease is caused by a retrovirus and...

Feline leukemia The disease is caused by a retrovirus and is the most common naturally occurring lymphosarcoma and accounts for nearly 30% of feline tumors. Based on the location

Define endurance capacity by standard running tests, Define Endurance capac...

Define Endurance capacity by standard running tests? Endurance capacity, on the other hand, is measured by standard running tests in which time to exhaustion is taken as the en

Alive and something that is a living organism, Is there a difference betwee...

Is there a difference between something that is alive and something that is a living organism?

Effect of ph or nutrient availability, Effect of pH or Nutrient Availabilit...

Effect of pH or Nutrient Availability One of the greatest influence of pH on plant growth is through its effect on the nutrient availability. When base saturation is less than

Draw a diagram that shows this arrangement, Please help with the following:...

Please help with the following: Using the letters S for ribose sugar and B for the nitrogeneus base, draw a diagram that shows the arrangement of these components into (a) a sin

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