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MrRa [10]
3 years ago
14

A method used by horticulturalists when they rotate the use of fields—planting crops on a particular piece of land for a period

of time, then letting it go fallow as they move on and begin planting again in a different area—is called:
Biology
1 answer:
svetoff [14.1K]3 years ago
8 0

Answer:

The correct answer will be- Crop rotation

Explanation:

When the growth of a type of crop which uses soil nutrients in abundance and then growing another crop in the same filed led to the decrease in the production of the next crop.

Thus farmers adapted to avoid such farming practices and developed a new practice which allowed the land to become fertile again so that the growth of next crop will not be affected.

The practice involved the planting of a crop on a piece of land then leaving the soil ploughed and unsown for a longer period of time and growing corp on another piece of land allowing the time to restore the nutrient content. This practice is known as "crop rotation".

Thus, crop rotation is the correct answer.

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Leukemia can be treated using human stem cells to attack and destroy cancer cells.

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4 years ago
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The polymerase chain reaction (PCR) has revolutionized biology and medicine, by allowing small regions of DNA to be amplified up
Usimov [2.4K]

Answer:

DNA polymerases from human cells will denature under these conditions.

Explanation:

Under the PCR conditions described, DNA polymerase from <em>T. aquaticus </em>would be more effective than DNA polymerase from human cells. This is due to the higher optimal temperature of DNA polymerase from <em>T. aquaticus. </em>

6 0
3 years ago
What would the result be if a drug that blocks the action of rna polymerase was introduced into a virus-infected organism?
Svetllana [295]

Answer:

The correct answer is: viral replication would stop.

Explanation:

Drugs that block the action of RNA polymerase in viruses are called antivirals and are used to cure viral infections like Hepatitis and Herpes.

<u>Antivirals do not destroy the virus but rather mess with its development by inhibiting its replication</u>.

Viruses do not have the capacity to replicate or synthesize proteins by themselves, so they need a host that can "lend them" the structures needed to perform those processes. If the drug blocks the RNA polymerase, the virus won't be able to replicate itself.

8 0
3 years ago
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The diagram shows structures found in a seed plant. What is the function of labeled X
Alja [10]

Question is incomplete. Complete question has been attached.

Answer:

carries food produced by leaves

Explanation:

The diagram is a cross section of stem of a dicot plant, specifically <em>Hypericum perforatum</em>. It shows all the structures present in the stem like xylem, phloem, pith, cortex etc. The structure labelled X is phloem. It is present between xylem (stained red) and peripheral cortex. Phloem is responsible for conduction of sugars and nutrients in the plant thus it carries the food produced by leaves. Together xylem and phloem make the vascular tissue which surrounds the central pith (stained bluish-green).

3 0
3 years ago
Which of the four types of organic compounds serve as an energy source for cells?
Tanya [424]
<span>Carbohydrates, Lipids, Proteins, and Nucleic Acids.</span>
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3 years ago
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