Question 1

In which part of the male reproductive system do sperms develop and mature?

Accepted Answer

Epididymis

Answer

Scrotum

Answer

Vas Deferens

Answer

Testes

Question 2

What sex hormone stimulates the development of secondary sexual characteristics in females?

Accepted Answer

Estrogen

Answer

Androgen

Answer

Testosterone

Answer

Progesterone

Question 3

Which hormones play the central role in both male and female reproductive functions?

Accepted Answer

Estrogen and testosterone

Answer

Testosterone and follicle - stimulating hormone

Answer

Luteinizing hormone and follicle-stimulating hormone

Answer

Progesterone and luteinizing hormone

Question 4

The following are the effects of testosterone in males EXCEPT:

Accepted Answer

enlargement of the breast.

Answer

growth of mustache.

Answer

deeper voice.

Answer

narrow hips.

Question 5

Before the 14^th day in the menstrual cycle, the secretion of luteinizing hormone (LH) increase, what causes this increase in the level of LH?

Accepted Answer

High estrogen secretions from the ovary

Answer

High FSH secretions from the pituitary gland

Answer

All options are correct

Answer

Low FSH and LF section from the pituitary gland

Question 6

Which of the following hormones triggers ovulation?

Accepted Answer

High level of LH

Answer

High level of FSH

Answer

Low level of FSH

Answer

Low level of LH

Question 7

Which statement is TRUE about menstruation?

Accepted Answer

During menstruation, only the functional layer of the endometrium is shed, with the basal layer remaining intact.

Answer

In a normal 28-day menstrual cycle you would expect menstruation to last approximately 3-5 days.

Answer

During menstruation, the entire endometrium is shed.

Answer

The absence of menstruation always indicates an active pregnancy.

Question 8

At which point in the menstrual cycle is a woman most fertile?

Accepted Answer

Days 9-16

Answer

Days 17-21

Answer

Days 22-28

Answer

Days 1-5

Question 9

Which division of the nervous system is responsible for the control of most bodily functions, including awareness, movements, sensations, thoughts, speech, and memory?

Accepted Answer

Central nervous system

Answer

Somatic nervous system

Answer

Parasympathetic nervous system

Answer

Sympathetic nervous system

Question 10

The receptors in a girl’s body detect changes in the environment. Which organs of the body contain the receptors for flashing red lights of an ambulance car?

Accepted Answer

Eyes

Answer

Ears

Answer

Nose

Answer

Skin

Question 11

The brain detects an increase in the level of blood sugar in the body. How will the body respond to this change to attain homeostasis?

Accepted Answer

The pancreas releases insulin triggering liver to take up glucose and store it as glycogen causing decrease in glucose level in the blood.

Answer

The pancreas absorbs the excess sugar in the blood causing decrease in glucose level in the blood.

Answer

The pancreas releases glucagon triggering liver to take up glucose and store it as glycogen causing decrease in glucose level in the blood.

Answer

All options are correct.

Question 12

Which best describes a DNA molecule?

Accepted Answer

Double helix

Answer

Made of amino acids

Answer

Contains Uracil

Answer

Ribose

Question 13

Which statement correctly differentiates RNA from DNA?

Accepted Answer

RNA is single-stranded and DNA is double-stranded

Answer

DNA uses Uracil and RNA uses Thymine

Answer

RNA has deoxyribose and DNA has ribose

Answer

RNA is double-stranded and DNA is single-stranded

Question 14

Which is NOT a necessary component of translation?

Accepted Answer

Ligase

Answer

Amino acid

Answer

mRNA

Answer

Anticodon

Question 15

At which part of the cell does translation occur?

Accepted Answer

Ribosome

Answer

Nucleus

Answer

Cell membrane

Answer

Chromosome

Question 16

A mutation is a change in the sequence of nitrogen bases of an organism. Which statement does not describe mutation?

Accepted Answer

Affect the offspring if it occurs in somatic cells.

Answer

An error in the base pairing during replication.

Answer

Caused by ionizing radiation, chemicals, or virus.

Answer

Codes for a functionally different protein.

Question 17

How does nonsense mutation affect the protein production in the cell? Nonsense mutation _____.

Accepted Answer

changes the base sequence but similar amino acid

Answer

shortens the chromosomal strand

Answer

changes amino acid sequence

Answer

shortens amino acid sequence

Question 18

How can a virus cause mutation in its host?

Accepted Answer

It causes inflammation, breakage, and damage to the DNA.

Answer

It replicates itself outside the host cell.

Answer

It changes location in a chromosomal DNA.

Answer

It changes its size in a chromosomal DNA.

Question 19

Refer to the figure. Which layer contains the oldest remains of organisms?

Accepted Answer

4

Answer

1

Answer

3

Answer

2

Question 20

Which evolutionary concept is depicted in the diagram below?

Accepted Answer

homologous structures

Answer

analogous structures

Answer

variation among species

Answer

embryological evidence

Question 21

Why do organisms with close biochemical similarities show stronger evolutionary relationships?

Accepted Answer

They have a common ancestor and have the same kinds of proteins.

Answer

They have similar pattern during their early stage of development.

Answer

They have varied and different ancestry.

Answer

They possess same vestigial structure that made their evolutionary relationship closer.

Question 22

According to the Theory of Use and Disuse, why do body structures become well-developed?

Accepted Answer

because they are used

Answer

because of competition

Answer

because of mutation

Answer

because they are not in use

Question 23

According to Lamarck, the Theory of Inheritance of Acquired Characteristics,

Accepted Answer

If an organism changes during life in order to adapt to its environment, those changes are passed on to its offspring.

Answer

Body parts that are not being used by the organism, such as the human appendix and little toes are gradually disappearing.

Answer

Evolution happens according to a predetermined plan and that the results have already been decided.

Answer

Elephants all used to have short trunks. When there was no food or water that they could reach with their short trunks, they stretched their trunks to reach the water and branches, and their offspring inherited long trunks.

Question 24

What is the idea of evolution according to Charles Darwin?

Accepted Answer

Animals evolve by adapting to their environment.

Answer

He suggested that life on Earth was 75,000 years old and that men had descended from apes.

Answer

Evolution by natural selection, is the process by which organisms changeover time as a result of changes in heritable physical or behavioral traits.

Answer

He believed that all organisms appeared on Earth in their present form and never changed.

Question 25

Organisms belonging to a species may demonstrate a unique trait. How can this variation in traits within a species increase their adaptation in the ecosystem?

Accepted Answer

Species with unique traits have a high percentage of proliferation rate compared to the species with common traits.

Answer

Organisms with desirable traits adapted and maintained the presence of their species in the ecosystem.

Answer

Predators will avoid the species with unique traits.

Answer

Unique traits among organisms allow them to proliferate.

Question 26

Why is biodiversity important to ecosystems?

Accepted Answer

It helps populations adapt to ecological changes.

Answer

It reduces the number of insects in each ecosystem.

Answer

It reduces the kind of species of organisms there by reducing competition.

Answer

It allows animals to feed permanently from one type of plant.

Question 27

In what ways is biodiversity related to stability?

Accepted Answer

The higher the biodiversity of an ecosystem, the more sustainable it is. Conversely, lower biodiversity equals less sustainability.

Answer

Major environmental changes caused by humans decreases plant growth.

Answer

Diversity loss and other large-scale environmental changes will interact to alter ecosystems.

Answer

The higher biodiversity in an ecosystem means that there is a greater variety of genes and species in that ecosystem.

Question 28

Which population curve shown on the right describes a sustaining population?

Accepted Answer

curve B

Answer

neither A nor B

Answer

curve A

Answer

both A and B

Question 29

The carrying capacity of a habitat describes the _______.

Accepted Answer

number of organisms living in a given habitat

Answer

number of animals that habitat can support.

Answer

number of rainfall that the habitat receives annually.

Answer

strength or resilience of the population.

Question 30

How does the population growth affects the carrying capacity of an ecosystem?

Accepted Answer

When the numbers of individuals in a population of animals, plants or humans exceed their carrying capacity, deaths outnumber births. As the population drops below carrying capacity, the birth rate grows until births outnumber deaths. When the population is at carrying capacity, the numbers stop fluctuating.

Answer

If the climate changes and the resources a particular animal needs for food drop, for example, that change in carrying capacity for one species will affect other populations in the area.

Answer

Human reliance on technology complicates the issue, since people have a certain ability to change their environments.

Answer

Carrying capacity for a species or populations relies on the number of available resources, population size and the resources each individual in the population consumes.

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