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.

Answer

During the mitotic prophase, the cell's chromatin condenses into visible chromosomes. Each chromosome has already replicated during the S phase, so it consists of two identical sister chromatids joined at the centromere. Therefore, "chromosomes are doubled and the duplicate chromatids may be observed" accurately describes a key event of this stage.

Question 2

Nephrons

Accepted Answer

filter the blood and reabsorb useful substances.

Answer

Nephrons are the microscopic functional units of the kidney, responsible for filtering blood and forming urine. They play a crucial role in maintaining fluid and electrolyte balance, removing waste products, and reabsorbing essential substances like glucose, amino acids, and water back into the bloodstream. This process ensures the body retains useful substances while excreting waste.

Question 3

Lake eutrophication is a risk.

Accepted Answer

when there is excess phosphorus.

Answer

Lake eutrophication is primarily caused by an excessive input of nutrients, particularly phosphorus and nitrogen, into aquatic ecosystems. When there is "excess phosphorus," it acts as a limiting nutrient, stimulating rapid growth of algae and aquatic plants. This overgrowth eventually leads to oxygen depletion when the plants die and decompose, harming other aquatic life.

Question 4

The cause of etiolation in plants is:

Accepted Answer

insufficient light.

Answer

Etiolation is a plant growth response that occurs in the absence of light. Plants undergoing etiolation exhibit characteristics such as elongated, weak stems, pale yellow leaves (due to lack of chlorophyll), and reduced leaf development. This adaptation allows the plant to quickly grow towards a light source, making "insufficient light" the direct cause.

Question 5

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

Accepted Answer

mutualism

Answer

Mutualism is a type of symbiotic relationship where two different species interact in a way that is beneficial to both. In this scenario, if one population is dependent on the advantages provided by another population to live, and presumably the other population also benefits (or at least isn't harmed), it describes a mutualistic interaction where both parties gain from the association.

BGS, BSGS Bachelor of General Studies Practice Test

BGS, BSGS Bachelor of General Studies Practice Test

Free BSGS Natural Sciences Question and Answer