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nekit [7.7K]
1 year ago
8

What was John’s hypothesis in the experiment? The hypothesis should make a prediction of the outcome of your experiment and shou

ld include an explanation of why you expect that outcome. This can be simplified into an if, then, because statement... IF (the independent variable does this), then (the dependent variable will do this), because (I learned this in the lesson)
Biology
1 answer:
valentina_108 [34]1 year ago
5 0

The hypothesis is a claim that correlates the dependent and independent variables to predict results. Hypothesis: <em>If the organic fertilizer is added to the substrate, then plants will grow taller.</em>

<h3>What is a hypothesis?</h3>

A hypothesis is a scientific conjecture, not verified, that requires corroboration. It is a possibility, but not a fact.

The researcher hypothesizes in order to predict what is going on or what is expected to occur. The hypothesis must express what is expected to occur in a perfectly comprehensive manner.

The hypothesis is a claim of how it works a relationship between two or more variables. The exposed relationship must be logical and clear.

The hypothesis must be objective. There are different kinds of hypotheses: descriptive, correlative, differentiative, or causative.  

To get to formulate a hypothesis, first we need to identify all the involved variables in the experiment. In the exposed example,

Goal: test the effects that organic and chemical fertilizers had on plant growth.

Independent variable: Type of fertilizer (organic and chemical).

Depedent variable: plant growth.

Controlled variables: type of seed, soil, water

Prediction: the organic fertilizer would make the plants grow taller.

Hypothesis: Here I propose three ways to write the same hypothesis.

  • If organic fertilizer is added to the substrate, then plants will grow taller.
  • Using organic fertilizer will make plants grow taller.
  • In comparison to chemical fertilizer, an organic fertilizer will make plants grow taller.

In this way, you can establish a direct relationship between the independent variable and the dependent one.

You can learn more about hypothesis at

brainly.com/question/2657326

#SPJ1

Complete question:

John had a science fair project that he needed to do. He wanted to test the effects that organic and chemical fertilizers had on plant growth. John predicted that the organic fertilizer would make the plants grow taller. He used three pots, three of the same type of seed, soil, organic fertilizer, chemical fertilizer, water, and a ruler. John put soil in the pots. He added chemical fertilizer to the first pot, organic fertilizer in the second pot, and no fertilizer in the third pot. He then planted one seed in each pot. John had to water the pots daily. He also checked for growth and took measurements for a period of 10 days. He measured the height of the plants.

<u>Days    No Fertilizer (cm)   Chemical Fertilizer (cm)   Organic Fertilizer (cm)</u>

1                     0                              0                                     0

2                    0                               0                                     0

3                     0                              0                                     0

4                     0                              0                                     0

5                     0                              0.5                                  0

6                     0                               1.3                                  0

7                      0                               1.9                                  0.3

8                     0                               2.2                                  1.6

9                     0                               4.5                                  3.2

10                 0.2                              5.2                                  3.8

John made a data table to record his measurements.

After the 10th day, John observed that the plant with the chemical fertilizer grew the most.

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Directional selection favors one of the extreme phenotypes over the other one. <u>Option C is correct</u>. Natural selection is the evolutive force, and 0.40, 0.40, and 0.20 are the new genotypic frequencies.

<h3>What is directional selection?</h3>

Directional selection is one type of natural selection. Let us remember that natural selection is an evolutive force.

Directional selection increases the proportion of individuals with an extreme phenotypic trait.

There must be a selective pressure or environmental pressure acting on populations to lead the species to increase the number of individuals expressing that extreme phenotype.

This selection presents more frequently in those cases in which interactions between living organisms and the environment modify in the same direction.

In the exposed example,

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- Grey beetles managed to camouflage with rocks since their gray color was similar.

- White beetles were exposed on the dark gray rocks, so they were easily seen by birds.

- Predation by birds was an environmental pressure that had a stronger influence on the white phenotype.

Natural selection favored gray-colored beetles, who could survive and reproduce.

Assuming a diallelic gene expressing complete dominance codes for beetles color, we can suggest that the frequency of one of the homozygous genotypes increased, while the other decreased to near cero. Heterozygous individuals kept the allele coding for the white phenotype.

Among the options, <u>C is the correct one</u>. Natural selection is the evolutive force, and 0.40, 0.40, and 0.20 are the new genotypic frequencies.

You can learn more about natural selection and  directional selection at

brainly.com/question/9830102

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