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3 years ago

Which of the following statements is FALSE regarding the effects of soil tillage?

Biology

2 answers:

abruzzese [7]3 years ago

4 0

Answer:

C. Tillage causes soils to get darker in color.

Explanation:

Tillage involves mixing and turning of the soil using certain tools. However this process could lead to decreased water infiltration, decreased level of soil organic matter and also making the soil more compact and susceptible to dangerous crop insects. Tillage doesn’t change the colour of the soil. The soil colour is determined by the water content in it and the basic nutrients it contains

antiseptic1488 [7]3 years ago

3 0

Answer:

Option (3)

Explanation:

Soil tillage is usually defined as the preparation and modification of soil by digging, overturning and stirring it, in order to grow crops. This has become essential for cultivation but it has many negative effects, as it leads to the erosion of soil particles, degrades the water quality, reduces the percolation of water into the subsurface, organic materials present in the soil are also decreased, and also the pore spaces between the materials also decreases.

Soil tillage has no impact on the color of the soil. It does not lead to the changing of the color. The soil attains its color depending on the mineral it comprises.

Thus, the correct answer is option (3).

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B ~ You cannot tell if someone was touching your hand

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Explain why there is a difference in the amount of oxygen taken in at rest and during the vigorous activity.

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Answer: During vigorous exercise your breathing rate increases in order to intake more oxygen

Explanation: during vigorous exercise / activity the body needs more oxygen in order to produce energy so your breathing rate increases in order to reach the demand of more intake of oxygen , and your muscles work harder due to an increase in oxygen demand and how much oxygen the muscles take from the blood during vigorous exercises , BUT during rest we have normal rate of oxygen intake because your body is at rest at that moment .

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3 years ago

What type of molecule is represented by the model below?

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Carbohydrate is remodel

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Solid sodium reacts with liquid water to form hydrogen gas according to the equation 2 Na(s) + 2 H₂O(l) → 2 NaOH(aq) + H₂(g) Wha

lana66690 [7]

Answer: 21850.42mmHg or 28.78atm

Explanation: From the equation of the reaction, 2 moles of sodium reacts with 2 moles of water to produce 2 moles of NaoH and 1 mole of hydrogen gas at s.t.p.

molar volume of gas at s.t.p. = 22.4dm^3,

standard temperature = 0°C or 273K,

standard pressure = 760mmHg or 1atm,

molar mass of Na = 23g;

volume of the container= 20L or 20dm^3

From the equation, 2 moles or 46g of Na produces i mole or 22.4 dm^3 of hydrogen.

Therefore, 1kg or 1000g of Na will produce 22.4 * 1000/(46)= 486dm^3 of hydrogen.

To find the pressure of the gas produced, the formula P1V1/T1 = P2V2/T2

P1= 760mmHg, T1= 273K, V1 (initial volume of gas)= 486dm^3, T2=50.0°C or 50+273K= 323K, V2( final volume of gas= volume of vessel)=20dm^3 P2=?

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3 years ago

All of the following are examples of limiting factors EXCEPT

Natasha2012 [34]

Answer:

Weather conditions

Explanation:

Food can be limited based on location, however, scientists can control what kind of food it is. Soil can be tested and experimented on. There can be a lot of it and different kinds. Space is fought over because of territories and is limited compared to how many people and animals there are. Weather is not something that can be controlled in an experiment since it is sporadic.

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