What would be considered a primary source a source must be?

What would be considered a primary source a source must be?

Primary sources are materials directly related to a topic by time or participation. These materials include letters, speeches, diaries, newspaper articles from the time, oral history interviews, documents, photographs, artifacts, or anything else that provides firsthand accounts about a person or event.

What is a primary source defined as?

Primary sources provide a first-hand account of an event or time period and are considered to be authoritative. They represent original thinking, reports on discoveries or events, or they can share new information. They often attempt to describe or explain primary sources.

Which of the following is a primary source?

Examples of primary sources: Theses, dissertations, scholarly journal articles (research based), some government reports, symposia and conference proceedings, original artwork, poems, photographs, speeches, letters, memos, personal narratives, diaries, interviews, autobiographies, and correspondence.

Which of the following is the best example of a primary source?

Examples of a primary source are: Original documents such as diaries, speeches, manuscripts, letters, interviews, records, eyewitness accounts, autobiographies. Empirical scholarly works such as research articles, clinical reports, case studies, dissertations. Creative works such as poetry, music, video, photography.

Which of the following is not considered a primary source?

Materials that are NOT primary sources include: Books written after a historical event by someone who was not involved in the event. Books are considered Secondary Sources.

How can a source be primary and secondary?

A primary source gives you direct access to the subject of your research. Secondary sources provide second-hand information and commentary from other researchers. Examples include journal articles, reviews, and academic books. A secondary source describes, interprets, or synthesizes primary sources.

What is the difference between primary source and secondary source?

Primary sources can be described as those sources that are closest to the origin of the information. Secondary sources often use generalizations, analysis, interpretation, and synthesis of primary sources. Examples of secondary sources include textbooks, articles, and reference books.

How do you know if it is a primary source?

Published materials can be viewed as primary resources if they come from the time period that is being discussed, and were written or produced by someone with firsthand experience of the event. Often primary sources reflect the individual viewpoint of a participant or observer.

Which is a secondary source?

Secondary sources are works that analyze, assess or interpret an historical event, era, or phenomenon, generally utilizing primary sources to do so. Secondary sources often offer a review or a critique. Secondary sources can include books, journal articles, speeches, reviews, research reports, and more.

What is the difference between primary and secondary introduction?

According to Bennett (1965), the introduction of wild plants into cultivation and the successful transfer of cultivars, with their genotypes unaltered, to new environments is called as ‘primary’ plant introduction and the rest as ‘secondary’ introduction.

What is primary plant introduction?

Plant introduction is a process of introducing plants (a genotype or a group of genotypes) from their own environment to a new environment. The process of introduction may involve new varieties of crop or the wild relatives of crop species or totally a new crop species for the area.

Which is the first step of plant introduction?

The four steps are: (1) Creation of genetic variation by various means (2) Selection (3) Evaluation and Release as a variety and (4) Seed multiplication and distribution among farmers.

What are the advantages of plants introduction?

Merits of Plant Introduction It provide new crop varieties. Quick & economical method of crop improvement. Protection of crops from damage by introducing them in to disease free areas. Development of superior varieties through selection & hybridization by using introductions.

What are the disadvantages of plant introduction?

Disadvantages of Plant Introduction

  • Introduction of diseases to the new area, not present earlier.
  • Introduction of insects, pests to the new area, not present earlier.
  • Introduction of noxious weeds to the new area not present earlier.

What is introduction as a method of crop improvement?

It can be defined as the “process of introducing plants from their growing locality to a new locality.” ADVERTISEMENTS: The introduction of the genotypes from the place where it is grown to an entirely new area. It is the easiest or most common method of crop improvement.

What is plant hybridization?

Hybridization. Hybridization is the process of crossing two genetically different individuals to result in a third individual with a different, often preferred, set of traits. Plants of the same species cross easily and produce fertile progeny.

What is hybridization with example?

Hybridization happens when atomic orbitals mix to form a new atomic orbital. In their ground state, carbon atoms naturally have electron configuration 1s2 2s2 2p2. The four outermost electrons, i.e. those in the 2s and 2p sublevels are available to form chemical bonds with other atoms.

What are the steps of hybridization?

The major steps involved in the process of hybridization are:

  • Selection of parents.
  • Emasculation,
  • Bagging,
  • Tagging,
  • Pollination or crossing,
  • Harvesting F1 seeds,
  • Further handling of the plants or distribution.

What is hybridization and its types?

Basically, hybridization is intermixing of atomic orbitals of different shapes and nearly the same energy to give the same number of hybrid orbitals of the same shape, equal energy and orientation such that there is minimum repulsion between these hybridized orbitals. …

What is the need for hybridization?

Hybridization allows for the most stable (and most desirable) structure. When there are hybrid orbitals there are enough electrons to complete the necessary bonds – regardless of whether there is a suitable number of valence electrons.

What is the first step in hybridisation?

The important steps involved in hybridization are: (1) Slection of parents. (2) Evaluation of parents. (3) Emasculation. (4) Bagging.

What is hybridization and its advantages?

The advantages of hybridization are: 1) They can increase the yield. 1) Two species combine to form the best of the organism eliminating the unwanted qualities of both the parent species. 2) They result in the formation of organisms which possess various qualities such as disease resistance, stress resistance etc.

What is Intergeneric hybridization?

An intergeneric hybrid is a cross between plants in two different genera in the same family. Intergeneric hybridization represents an opportunity to combine genomes from distinctly different plants and to introgress traits not found in the main genus of interest. Many intergeneric hybrids are infertile.

What is Intergeneric hybridization give an example?

Crossing of two species that are from within the same genus. Examples are zebra/donkey cross resulting in an offspring called zonkey, zebra/horse cross resulting in zorse, and zebra/donkey cross resulting in zonky.

How is somatic hybridization carried out?

Isolated single cells from plants and after digesting their cell walls, isolated naked protoplasts (surrounded by plasma membrane). Isolated protoplasts from two different varieties of plants each having a desirable character are fused to get hybrid protoplasts. These hybrids are called somatic hybrids.

What is distant hybridization?

Distant hybridization refers to crosses between two different species, genera, or higher-ranking taxa, which can break species limits, increase genetic variation, and combine the biological characteristics of existing species.

What are the barriers for successful distant hybridization?

This is a major problem in distant hybridization. There are three main reasons of cross incompatibility, viz. lack of pollen germination, insufficient growth of pollen tube to reach ovule and inability of male gamete to unite with egg cell. These barriers are known as pre-fertilization barriers.

What are the barriers in wide hybridization?

In ornamental crops it has been used due to its ability to create novelty. The barrier to wide hybridization includes external (e.g., spatial isolation, ecological isolation, mechanical isolation, and cross incompatibility) and internal (hybrid inviability, hybrid sterility, and hybrid breakdown).

How do you overcome wide hybridization?

Hybrid inviability and weakness leading to chromosome elimination, lethality and embryo abortion….

  1. Backcross breeding. When interspecific crosses between two species of varying ploidy level are made invariably the hybrids are sterile.
  2. Amphidiploidy.
  3. Bridging species Technique.
  4. Alien-addition and Alien substitution lines.