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2 years ago

which of the following method is used to prevent soil erosion? tilling, contour farming, fertilizer, worms

Biology

1 answer:

Verizon [17]2 years ago

5 0

Answer:

contour farming

Explanation:

Contour farming is the method of growing crops on sides of hills, mountains and steep slopes by planting on graduated terraces built into the slope. This method effectively reduce soil erosion and water loss and maximizes arable land area. In most of the systems the contours are low, flat ridge of earth built across the slope, with a channel for runoff water just above the ridge. In areas where soils are able to take in water and rainfall amount is relatively low, level terraces may be used to reduce soil erosion too.

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A scientist wishes to determine the effect of a digestive enzyme on starch digestion (starch is broken down into glucose). The e

Sladkaya [172]

Answer:

An identical setup but replacing the enzyme with an equal volume of water

Explanation:

When carrying out any experiment, it is important to set out a control in order to increase the reliability of the data and results.

The control minimizes the effects of variables other than the independent variable.

In the above experiment, starch has to be eliminated and replaced with water. Water does not have starch hence the digestive enzyme being tested will not have any effects making the data and results from the experimental group reliable.

4 0

2 years ago

Calculate the mass defect for oxygen-16 given this data. Round to the 5es001-1.jpg decimal place. mass of an oxygen-16 atom: 15.

Naya [18.7K]

Answer:

Explanation:

Given parameters:

Mass of oxygen atom = 15.994914amu

Mass of a proton = 1.00728amu

Mass of a neutron = 1.00866amu

Unknown:

Mass defect = ?

From the periodic table, the number of the elementary particles in a neutral Oxygen atom is given below:

Number of protons = 8

Number of neutrons = 8

Number of electrons = 8

Solution

The mass defect examines the difference between the actual mass of an atom and sum of masses of the nucleons.

The mass of an atom is concentrated in the nucleus which contains protons and neutrons. Electrons have little to no weight compared with the nucleons.

To calculate the mass defect, we first know the mass of the nucleons first:

1 proton has a mass of 1.00728amu

8 protons will weigh: (8 x 1.00728)amu = 8.05824amu

For the neutrons:

1 neutron has a mass of 1.00866amu

8 neutrons will weigh: (8 x 1.00866)amu = 8.06928amu

Mass of the nucleons = mass of protons + mass of neutrons

= 8.05824amu + 8.06928amu

= 16.12752amu

The mass defect = mass of the nucleons - mass of the atom

= 16.12752amu - 15.994914amu

= 0.132606amu ≅ 0.13261amu to 5 decimal places

6 0

3 years ago

Read 2 more answers

Which statement best describes an effect of natural selection

I am Lyosha [343]

The answer should be B). Helpful traits passed to the next generation through reproduction.

B is correct because in natural selection, if a population cannot adapt over time it will be “naturally selected” and die off, or be near extinction due to non-adaptive ness. Hope this helped!

7 0

3 years ago

A plant with purple flowers is allowed to self-pollinate. Generation after generation, it produces purple flowers. This is an ex

Virty [35]

Answer:

True breeding

Explanation:

True breeding is a breeding in which parents produce the offspring which carry same phenotype.

The parents in true breeding are homozygous for every trait.

<u>True breeding occurs in the plants when the plants produce offspring of same variety only when self pollination takes place. </u>

<u>For example, if a plant has purple flowers will produce only seeds which will grow into plants which have purple flowers.</u>

7 0

3 years ago

Lipid

Daniel [21]

The answer is A) Carbon
Hope this helps.

5 0

3 years ago

Read 2 more answers