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WorksheetsPre-test (Science 9)
Total questions: 15
Worksheet time: 8mins
Which among the following compounds leaves the cells as a waste product of respiration which then joins the bloodstream?
ammonia
carbon dioxide
carbon monoxide
hydrogen chloride
In which part of the lungs does a gas exchange take place?
alveolus
bronchiole
capillary
bronchus
When the diaphragm relaxes, it pushes up the lungs and
drives CO2 out of the body
enhances the movement of O2
facilitates lung expansion
slows down blood flow
Methane is continuously made in the Payatas dumpsite because of the non-stop burning of garbage. Among those who scavenged in the area, what might be the most likely medical condition that they could suffer from?
respiratory conditions like asthma
scratches and bruises
diarrhea or other intestinal problems
dehydration from too much garbage smoke
A handful of cities in the Philippines have effectively banned smoking in the public. Health experts have repeatedly emphasized that cigarette smoking directly harms the respiratory system in many ways. Which of the following would possibly happen?
There would be an increase of CO2 flow towards the lungs.
The airways would become smaller and irritated (as seen in coughing).
There would be a slow phlegm flow from the larynx to the bronchi.
There would be a transfer of beneficial nutrients from the body to cigarette smoke.
Which disorder of the circulatory system causes the blood not to clot properly allowing the bleeding to persist?
atherosclerosis
leukemia
hemophilia
coronary heart disease
Basti will be joining a 10-kilometer fun run. He finds it challenging not just because of the distance but also because of the chosen terrain. What could have been the reason for the participants who will find it even more challenging if they do not have much physical activity?
Blood flow is slowed by poorly warmed-up muscle groups in the arms.
Gas exchange does not occur in their respiratory system.
Their ability to warm up is less than the other runners.
They have low endurance and would easily tire.
A plant bearing pink flowers is allowed to pollinate itself. Every generation thereafter, the plant still produces pink flowers. Which condition does this apply?
hybridization
incomplete dominance
inbreeding
codominance
Which of the following influenced Mario’s thinning hair like that of his father?
crossing-over
mutation
linked genes
sex chromosomes
Which of the following determines a person’s athletic ability?
education
genes
environment
both b and c
It is believed that about 90% of the land area of the Philippines was once covered with forest. This has now been reduced to less than 20% and, if the current rate of deforestation is maintained, no forest cover shall remain within the next decade. Scientists are looking at tropical deforestation rates as parameters to estimate the species extinction rates in the Philippines. Which of the following best illustrates this situation?
An ecosystem cannot survive without producers.
Many species are endangered due to habitat loss.
Species go extinct even before they are discovered.
Tropical forests are great carbon sinks.
Which population is most likely to exhibit an evolutionary response to a change in its environment?
A population in which all organisms are genetically identical and have a high reproductive rate.
A population in which the effect of the competition is increased by lack of behavioral adaptation.
A population in which has high genetic variability.
A population on an isolated island.
Which part of the chromosome controls the development of the inherited traits of an organism?
centromere
genes
kinetochore
telomere
Which of the following is a common by-product that is involved in both photosynthesis and respiration?
carbon dioxide
oxygen
ATP
glucose
What is the overall goal of cellular respiration?
To manufacture food
To break down glucose
To capture energy from glucose
To make water and carbon dioxide
