The most useful graph for displaying the relationship between two quantitative variables is a scatterplot.
Which of the following distinguishes an observational study from a randomized experiment quizlet?
Which of the following distinguishes an observational study from a randomized experiment? In an observational study treatments are not randomly assigned, whereas in a randomized experiment treatments are randomly assigned.
When a virus is placed on a tobacco leaf small lesions?
When a virus is placed on a tobacco leaf, small lesions appear on the leaf. To compare the mean number of lesions produced by two different strains of virus, one strain is applied to half of each of 8 tobacco leaves, and the other strain is applied to the other half of each leaf.
Will deer eat tobacco plants?
Deer prefer soybeans, corn, hedgerow, and many other palatable plants. However, when they cannot access the crops they normally prefer, deer will go after non-palatable plants, including tobacco. Also, note that deer may only browse around the tobacco plantation but not go into it for obvious reasons.
Which of the following can be used to show a cause-and-effect relationship between two variables? – Related Questions
Is tobacco good for soil?
We take great care to mix the proper amounts of carbon and nitrogen so that it breaks down quickly, with little odor, and becomes the best natural fertilizer it can be.” Tobacco is an excellent source of nitrogen, so it’s beneficial to the composting process.
Which virus affects the leaf of tobacco?
– tobacco leaf curl virus (TLCV), viruses belonging to the family Geminiviridae, and to Begomovirus genus. This virus causes stunting of plants and curled, twisted leaves with enations on the underside of the leaf along the veins.
What is the name of the virus that infects tobacco leaves?
Tobacco mosaic virus (TMV) is named for one of the first plants in which it was found in the 1800s. However, it can infect well over 350 different species of plants.
What does tobacco mosaic virus do to leaves?
Symptoms induced by Tobacco mosaic virus (TMV) are somewhat dependent on the host plant and can include mosaic, mottling (Figures 1 and 2), necrosis (Figures 3 and 4), stunting, leaf curling, and yellowing of plant tissues.
Which virus is responsible for infection in tobacco plant?
Tobacco mosaic virus (TMV) is a positive-sense single-stranded RNA virus species in the genus Tobamovirus that infects a wide range of plants, especially tobacco and other members of the family Solanaceae.
Does mosaic virus stay in soil?
These investigations have shown that the virus may survive in soils for periods of 1 year or more, but that it is subject to relatively rapid inactivation under certain natural conditions.
Does mosaic virus affect all plants?
This virus infects more than 150 types of plants, including many fruits, vegetables, and flowers. It is characterized by leaves mottled with yellow, white, and light and dark green spots or streaks. Some of the most commonly infected plants include tomatoes, potatoes, squash, and cucumbers. But will infect others.
Who named virus first?
Six years later, in 1898, a Dutch biologist named Martinus Beijerinck carried out similar experiments himself, he claimed to have found a new type of infectious organism and named it “virus”.
Who discovered vaccine?
Dr Edward Jenner created the world’s first successful vaccine. He found out that people infected with cowpox were immune to smallpox. In May 1796, English physician Edward Jenner expands on this discovery and inoculates 8-year-old James Phipps with matter collected from a cowpox sore on the hand of a milkmaid.
What does Covid stand for?
Ct – cycle threshold. COVID-19 – Coronavirus Disease 2019.
What was the first human virus?
The first human virus to be identified was the yellow fever virus. In 1881, Carlos Finlay (1833–1915), a Cuban physician, first conducted and published research that indicated that mosquitoes were carrying the cause of yellow fever, a theory proved in 1900 by commission headed by Walter Reed (1851–1902).
Who is father of virus?
Martinus Beijerinck is often called the Father of Virology. Beijerinck’s laboratory grew into an important center for microbiology.
Is the virus alive or dead?
So were they ever alive? Most biologists say no. Viruses are not made out of cells, they can’t keep themselves in a stable state, they don’t grow, and they can’t make their own energy. Even though they definitely replicate and adapt to their environment, viruses are more like androids than real living organisms.
How old is the oldest virus?
Nudiviruses, which primarily affects insects and marine arthropods, date back to about 310 million years ago, making it the oldest known virus in the world.
