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3 years ago

Identify each statement as either true or false

Biology

2 answers:

balu736 [363]3 years ago

6 0

<h2>Answer:</h2><h3>Part 1.</h3>

<em><u>The greater the mass, the greater the gravitational pull.</u></em> True.

<h3>Explanation:</h3>

Gravitational force is the attractive force applied on an object by the earth, which is equal to the mass of the object.

Gravitational forces is directly proportional to mass of object.

Hence greater the mass, greater the gravitational force.

<u><em>Gravitational pull decreases with an increase in the distance between two objects.</em></u> True.

<h3>Explanation:</h3>

Gravitational force depends upon the two factors:

Distance, between the object and earth.

Mass of the object.

Gravitational force is inversely proportional to the sequre of distance.

Hence increase in distance will lower the gravitational pull.

<em><u>If there were no gravity, planets would collide with another one. </u></em>True

<h3>Explanation:</h3>

As the gravitational pull on planets is the attractive force on planets by sun.

Due to which each planet is moving in distinct separated path.

As if there is no gravitational pull the planet will be no more in any path.

They will move randomly, colliding each other.

<em><u>An objects mass is less on the moon than it is on earth. </u></em>True

<h3>Explanation:</h3>

As the gravitational mass depends upon the mass and moon has less mass than earth.

Its gravitational force will also weak, it will attract object with less attraction, making mass of object less.

Because gravitational force is the attractive force applied on an object by the earth, which is equal to the mass of the object.

That's why an object on moon will has less mass than earth.

<em><u>The momentum of moving planets does not depends on their masses. </u></em>False

<h3>Explanation:</h3>

The momentum in moving planets is known as angular momentum.

Angular momentum = mass × velocity × distance

So according to above formula momentum is directly proportional to mass.

Hence statement if false statement.

<em><u>The sun revolves in an orbit within our galaxy</u></em>. True

<h3>Explanation:</h3>

Yes, sun revolves around the center of milky way galaxy.

The shape of milky way galaxy is spiral shape and we are moving aroun this galaxy's center at the speed of 828,000 km/hr.

It takes 230 million years to make one complete orbit around the Milky Way at high rates.

Cloud [144]3 years ago

5 0

True

False

Let me know if I’m right

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You are a botanist looking at the plant color in a new breed of Snapdragon. The two parent plants are Blue and Green and when yo

irakobra [83]

Answer:

Incomplete dominance is the inheritance pattern where the dominant allele did not mask the recessive allele completely and form a mix of both alleles. Here the inheritance is the incomplete inheritance. The ratio of F2 generation is 1:2:1.

Given:

R1R1 = 42

R2R2 = 39

R1R2 = 86

Total R1 alleles = 2*42+86 = 170

Total R2 alleles = 2*39+86 = 164

Total alleles = 334

Frequency of allele R1 = 170/334 = 0.51

Frequency of allele R2 = 164 / 334 = 0.49

Expected number of each phenotype:

Total population = 167

Blue = R1R1 = 0.51 * 0.51 * 167 = 43.44

Green = R2R2 = 0.49 * 0.49 * 167 = 40.10

Cyan = 2*R1*R2 = 2*0.51*0.49*167 = 83.46

Phenotype Observed(O) Expected (E) O-E (O-E)2 (O-E)2/E

Blue 42 43.44 -1.44 2.0736 0.0477

cyan 86 83.46 2.54 6.4516 0.0773

green 39 40.1 -1.1 1.2100 0.0302

Total 167 167 0.1552

Chi-square value = 0.155

Degrees of freedom = no. of phenotypes – 1

Df = 3-1 = 2

Critical value = 5.99

Chi-square value of 0.155 is less than the critical value of 5.99. So we accept the null hypothesis.

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3 years ago

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Answer:

Explanation:

When you are in the northern hemisphere, you are near the north pole. If you are in the Southern Hemisphere, you are closer to the South Pole. As you probably already know, the earth is tilted. When you are closer to the equator, your number of daylight hours increase. The farther you are from the equator, the less daylight you will receive.

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All of the following describe possible results of competition between two species except A) competitive exclusion. B) aposematic

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Answer:

B) aposematic coloration

Explanation:

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