Step 1: Understanding the different types of botanical references.
A 'Key' is typically used to identify species within a group, 'Manual' is a handy book for identification, 'Flora' describes the plants of a particular region, and a 'Monograph' deals extensively with a single taxon.
Step 2: Determining the correct answer.
Since the question asks for books having information on any one taxon, the best answer is 'Monograph'. A monograph is a detailed study focused on a single taxon, providing comprehensive information on that specific group, which may include anything from a single species to a genus or even a family.
The technical presentation of Mango should be as follows:
I. Abbreviated form of author name after the specific epithet
II. Both the words should be printed in italics
III. The first word must represent genus
IV. Name should not be underlined when handwritten
| LIST I Traditional crop | List II Botanical Name | ||
| A | Mungbean | I | Glycine max |
| B | Black gram | II | Arachis hypogaea |
| C | Groundnut | III | Vigna mungo |
| D | Soybean | IV | Vigna radiata |
Two concentric thin circular rings of radii 50 cm and 40 cm each, carry a current of 3.5 A in opposite directions. If the two rings are coplanar, the net magnetic field due to the two rings at their centre is: