Free BSGS Natural Sciences Question and Answer

Question 1

During the mitotic prophase,

Accepted Answer

chromosomes are doubled and the duplicate chromotids may be observed.

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tetrads of chromatids appear.

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the centriole reappears.

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During the mitotic prophase,

Question 2

Nephrons

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filter the blood and reabsorb useful substances.

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are functional units of the spleen.

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regulate body temperature

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excrete only water.

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are functional units of the pancreas.

Question 3

Lake eutrophication is a risk.

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when there is excess phosphorus.

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when there is insufficient phosphorus

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when essential nutrients are insufficient.

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during prolonged high temperatures.

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as a result of too many fish.

Question 4

The cause of etiolation in plants is:

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insufficient light.

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synergism.

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photoperiodism.

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parthenocarpy.

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taxis.

Question 5

When one population is dependent on the advantages provided by another population in order to live, the connection is known as:

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mutualism

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aggregation

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communalism

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coordination

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neutralism

Question 6

How does niacin help to maintain?

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normal nerve functioning

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normal blood clotting

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normal bone formation

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normal cellular oxidations

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night vision

Question 7

In an ecosystem, sulfur is significant because it is:

Accepted Answer

essential for many proteins in certain enzymes.

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important for salt balance in vertebrate blood.

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important in nerve impulse transmission

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essential in photosynthesis.

Question 8

Although they have the same elements as carbohydrates—carbon, hydrogen, and oxygen—fats are different from them in that they:

Accepted Answer

proportionally less oxygen

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little stored energy

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twice as much hydrogen as oxygen

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proportionally more oxygen

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an excess of carbon

Question 9

Folic acid deficiency could lead to:

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a type of anemia

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beriberi

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hemorrhage following surgery

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sterility

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gray hair

Question 10

An organism that can create its own nourishment is referred to as:

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autotrophic

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parasitic

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holozoic

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saprophytic

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heterotrophic