WorksheetsDOST Reviewer (SCIENCE)
Total questions: 60
Worksheet time: 3600secs
Using a compound microscope, a person wants to view a plant cell under a magnification of 100x.
Given that the eyepiece has a magnification of 20x, which objective should be used to achieve your desired magnification?
5x
20x
80x
100x
Plants produce their own food molecules through a process called photosynthesis.
What do plants need for photosynthesis to push through?
light only
light and water
light, water, and carbon dioxide
light, water, carbon dioxide, and oxygen
Imagine you have a pet animal called Diwata. Diwata is fat and she has a very thick fur coat. She also likes to sleep for months at a time.
After a year in your house in the Philippines, you notice that Diwata is suffering. You then decide to release her back to her natural habitat. Which biome do you think is right for her?
Desert
Tundra
Savanna
Tropical Rainforest
Flowering plants, such as daisies and orchids, belong to Magnoliophyta. Based from the phylogeny of their characters, the flower of a daisy and the flower of an orchid have been acquired from a common ancestor.
If the daisy and the orchid’s common ancestor have a flower, what can be inferred from this character?
This character is said to be analogous.
This character is said to be homologous.
This character is said to be discontinuous.
This character is said to be homoplasious.
How is spermatogenesis different from oogenesis?
Sperm cells take a longer time to develop, unlike egg cells.
Ovum is produced in a continuous manner, unlike in sperm production.
Spermatogenesis occurs at certain parts of childhood while oogenesis occurs only during adolescence.
There are prolonged interruptions in oogenesis unlike in spermatogenesis which occurs in a constant manner.
Rico, having a blood type AB, married Cora with a blood type B. They had four children with the following blood types:
Child 1 - blood type AB; Child 2 – blood type B;
Child 3 - blood type A; Child 4 – blood type B.
By performing a testcross, what is the genotype of Cora?
IBi
IAi
IBIB
ii
In your Biology class, you look into a compound microscope. You notice that the organism you are trying to view is out-of-focus.
Which microscope part do you adjust to sharpen the focus?
mirror
eyepiece
fine adjustment knob
coarse adjustment knob
For your birthday, a friend gave you a plant as a gift. You named the plant Pag-asa. Pagasa is succulent, has many spines and barely no leaves.
Which biome is Pag-asa’s natural habitat?
Desert
Tundra
Grassland
Tropical Rainforest
All the following are postulates of Kinetic Molecular Theory of gases, EXCEPT:
The collisions between molecules are elastic.
The gas molecules are in constant, random motion.
At lower temperatures, molecules have higher kinetic energies.
The volumes of the molecules are negligible compared with the volume of the container.
Which of the following pairs of chemical formula and chemical name is correctly matched?
AlPO4 : aluminum phosphate
CaSO3 : calcium sulfide
LiNO2 : lithium nitrate
NaClO : sodium chlorite
Based on electronegativity, which of the following compounds is not ionic?
C3H8
BaF2
MgCl2
NaI
You have a mixture of sand, copper, and water in a beaker, and your task is to separate each component.
Which experimental design will you follow to separate the components most effectively?
First, slowly decant the mixture to separate water from sand and copper, then distill the resulting mixture to separate copper and sand.
First, filter the mixture in a funnel to separate copper and sand from water, then recover copper from sand using a magnet.
First, recover copper from the mixture using a magnet, then distill to separate water and sand.
Centrifuge the mixture first, then slowly decant to separate water from copper and sand, then distill the resulting mixture to separate copper and sand.
The red coloration of Poinsettia (Euphorbia pulcherrima) are caused by a combination of organic dyes found in the leaves.
If you want to study these compounds, how would you design an experiment which will separate the pigments in the Poinsettia leaves?
First, boil the leaves to extract the mixture of dyes, filter, then distill the resulting solution
First, boil the leaves to extract the mixture of dyes, filter, then centrifuge the resulting solution.
First boil the leaves to extract the mixture of dyes, filter, then evaporate the remaining solvent.
First, boil the leaves to extract the mixture of dyes, filter, then perform chromatography using the resulting solution.
Determine the unknown compound given the qualities given below:
1) solid at room temperature;
2) dissolves in a cup of water; and
3) conducts electricity when dissolved in water.
Glucose; a covalent compound
Glucose; an ionic compound
Sodium chloride; a covalent compound
Sodium chloride; an ionic compound
The following graph shows the displacement vs. time graph of a “GRAB TAXI” that you have boarded from home.
At what point shows that the taxi is NOT moving?
A and D
D and C
B and E
E only
Which of the following will require the greatest amount of mechanical work?
Lifting a 2-kilogram box 6 meters high
Lifting a 3-kilogram box 5 meters high
Lifting a 4-kilogram box 4 meters high
Lifting a 5-kilogram box 3 meter high
Which of the following consumed the greatest amount of energy?
a 20-watt incandescent bulb used for 24 hours
a 40-watt fluorescent lamp used for 8 hours
a 60-watt electric fan used for 6 hours
a 100-watt LCD TV used for 4 hours
Which of the following consumed the least amount of energy?
a 5-watt LED bulb used for 24 hours
a 20-watt incandescent bulb used for 12 hours
a 40-watt fluorescent lamp used for 10 hours
a 60-watt electric fan used for 6 hours
The energy within the oceans is distributed through which process?
conduction
convection
radiation
refraction
The Earth is heated by the Sun by which process?
conduction
convection
radiation
refraction
An object with what looks like a tail is visible in the sky for days. The object seems to be a _____________.
Meteor
Comet
Meteoroid
Bolide
Which of the following images shows the correct configuration of the Earth, Moon, and Sun during a total solar eclipse?
You observe that when you are looking at the front of your house at 8:00 AM, the sun is to the right of you. Returning to the same exact spot at 4:00 pm, you notice that the sun is now to the left of you.
In which direction were you facing at 8:00 AM and 4:00 pm?
east
north
south
west
Mara poured saltwater solution on a cup of sand which she got from a beach in one of their outings. After a week she found out that a residue was left on the cup.
The residue cemented the sand grains together, forming a rock-like hardened material. The residue is most likely similar to a/an ___________.
clastic sedimentary rock
extrusive igneous rock
foliated metamorphic rock
intrusive igneous rock
A mixture of sediment was placed on the closed-edge table. The faucet was turned on and allowed the sediment to flow downward. The sediment began forming at the lower end until a delta plane is formed.
Using the illustration, how can a delta be formed without excessive mass movement?
Turn on the faucet with water running smoothly and adjust the table on a low slope.
Turn on the faucet with water running smoothly and adjust the table on a high slope.
Turn on the faucet with water running turbulently, then adjust the table on a low slope.
Turn on the faucet with water running turbulently, then adjust the table on a high slope.
A typhoon warning has been raised in your area. You are trying to determine when the typhoon will arrive in your area.
Which of the following information will you need to look up?
Diameter of the Storm
Maximum Wind Speed
Location of Landfall
Movement Speed
What is the correct sequence of precautions to take before, during, and after a typhoon based on the following?
I. Stay away from floodwaters, they may carry water-borne diseases.
II. Check the roof and windows of your house for any damage or loose attachment.
III. Monitor the weather reports and the weather outside
IV. Pack a bag with water, food, clothes, batteries, flashlights, and other necessities.
I – II – III - IV
III – II – I - IV
II – IV – I - II
IV – II – III – I
The slope angles, nature of slope material, and water saturation are some of the factors controlling the mass wasting process.
Which of the following is a recipe for landslides?
low angle slope, soil, and wet conditions
high angle slope, soil, and wet conditions
low angle slope, rock, and wet conditions
high angle slope, rock, and dry conditions
A typhoon warning has been raised in your area. You are trying to determine the nearest town that you can evacuate to avoid the effects of the typhoon.
Which of the following information will you need to look up?
Diameter of the Storm
Maximum Wind Speed
Amount of Rainfall
Movement Speed
Which of the following precautions SHOULD NOT be done while a typhoon is in your area?
Stay away from floodwaters, they may carry water-borne diseases.
Check the roof and windows of your house for any damage or loose attachment.
Monitor the weather reports and the weather outside.
Pack a bag with water, food, clothes, batteries, flashlights, and other necessities.
Ceres is a 1000-km diameter rocky body that orbits the sun.
From this description, what is the correct classification that can be inferred of Ceres?
Asteroid
Comet
Meteor
Meteorite
Using a compound microscope, you want to view a plant cell under a magnification of 100x.
Given that the eyepiece has a magnification of 10x, which objective should be used to achieve the desired magnification?
10x
90x
100x
110x
Imagine you have a pet fish called Kalayaan. You keep Kalayaan inside an aquarium, but she looks very weak. You then decide to add a tablespoon of salt into the water and this made her look healthy. After a year of taking care of her, you decide to release her back to her natural habitat so that she can reproduce freely.
Which aquatic biome do you think is right for her?
River
Stream
Estuary
Freshwater Lake
Cactus and euphorbs have prominent sharp and pointed spines on the surface of their body. The spine of cactus and stem-succulent euphorbs is a character that arose from a common evolutionary origin.
What can be inferred from this character?
This character is said to be analogous.
This character is said to be homologous.
This character is said to be discontinuous.
This character is said to be homoplasious.
Brielle loves the sour taste of vinegar. This sour taste is due to an organic compound called acetic acid.
What is the functional group present in acetic acid?
acid halide
alkyl halide
carboxylic acid
acid anhydride
Calcium phosphates are historically known as good material for tooth replacement, repair of large bone defects caused by tumors, and as injectable cement. One simple way of producing calcium phosphate is by collecting it from the reaction of Calcium chloride and Sodium phosphate.
Write the balanced chemical equation to produce calcium phosphate.
CaCl2 + Na3PO4 → Ca3(PO4)2 + NaCl
2CaCl2 + Na3PO4 → Ca2PO4 + 3NaCl
3CaCl2 + 2Na3PO4 → Ca3(PO4)2 + 6NaCl
3CaCl2 + Na3PO4 → Ca3(PO4)2 + 3NaCl
Arrange the following steps to determine the empirical formula of a compound.
I. Determine the ratio by dividing the number of moles of each element by the lowest number
II. Compute for the number of moles from the given mass of each element.
III. Use the resulting ratio as the subscript in the formula
IV. Identify the mass of each element stated in the problem or from the percentage given.
IV, III, I, II
II, III, I, IV
II, I, III, IV
IV, II, I, III
What is the electronic configuration for a ground state element with a nuclear charge of +16?
1s2 2s2 3s2 2p6 3p4
1s2 2s2 2p2 3s6 3p4
1s2 2s2 2p6 3s2 3p4
1s2 2s2 2p6 3s1 3p5
Which of the following nuclides have the same number of protons, neutrons, and electrons?
^9 B (Z = 5)
^13C (Z = 6)
^14N (Z = 7)
^17O (Z = 8)
Which of the following nuclides have the same number of protons, neutrons, and electrons?
^9B (Z = 5)
^13C (Z = 6)
^15N (Z = 7)
^16O (Z = 8)
The propagation of a mechanical wave is described by the graph.
What is the wavelength of the wave?
π m
2π m
3π m
4π m
A stone is thrown at an angle, 𝜃, from the ground such that it becomes a projectile as shown in the figure.
At what angle, 𝜃, from the ground should the projectile be thrown so that it will have the maximum range?
0°
45°
60°
90°
Ben’s Monday morning school activities include the following:
I. Fifteen minutes of break time spent eating in a table at the canteen.
II. Twenty minutes to walk to the nearby lecture room in Science.
III. Two hours to attend the Science lecture laboratory.
IV. Twenty-minute walk to a nearby canteen. V. An hour to attend a lecture in Math.
Which two activities are NOT reasonable and require a change of speed in doing?
I and III
III and IV
I and V
II and IV
The following graph shows the displacement vs time graph of a tricycle that you have boarded in going from your home to the market.
What is the final displacement of the tricycle that you have boarded?
0 m
4 m
8 m
12 m
Zeon’s Sunday trip from home using his bicycle is described by the following activities:
I. Two hours bus nonstop trip from home to the church 70 m away.
II. An hour spent attending the mass.
III. One-minute walk to the market 1 km away from the church.
IV. Thirty minutes spent buying goods from Aling Susan’s grocery store in the market.
Which two activities are NOT reasonable and require a change of speed in doing?
I and II
II and III
I and III
I and IV
In a velocity versus time graph, how can a horizontal graph be interpreted?
maximum displacement
constant velocity
increasing speed
changing acceleration
What rock layers are older than the fossil in limestone D?
Siltstone (P), shale (M), limestone (C), and sandstone (L)
Siltstone (O) and sandstone (Q) only
Siltstone (P) and sandstone (L) only
Siltstone (O) only
You come across a fossil that is believed to be petrified wood. You are curious to know how old this fossil is.
What dating technique will you use to know the age?
Relative Dating: Superposition
Relative Dating: Fossil Succession
Absolute Dating: Carbon Dating
Absolute Dating: Potassium-Argon (K-AR) Dating
Which of the following properties affect the severity of the seasons all over the Earth?
Distance of the Sun from the Earth
The Speed of the Earth’s Rotation
The Tilt of the Earth on its Axis
The Circumference of the Earth
A typhoon warning has been raised in your area. You are trying to determine the possible damage that it might cause.
Which of the following information will you need to lookup?
Diameter of the Storm
Maximum Wind Speed
Location of Landfall
Movement Speed
The diagram shows soil development below from the underlying bedrock to the thick upper soil layer.
What change would most likely increase the thickness of the upper soil layer?
an increase in the air pressure
an increase in the biological activity
a decrease in slope
a decrease of the amount of rainfall
One important discussion that should be tackled in the classroom is the wise consumption of energy. Energy comes in two sources like renewable and non-renewable sources.
Why is it very essential to learn about these sources in school?
It becomes a significant part of human lives to differentiate how renewable and non-renewable sources be used.
Knowing these sources of energy plays an important role for people to value resourcefulness and energy conservation.
The lifestyle is very much dependent on the utilization of these sources of energy.
All of the reasons presented are correct.
The slope angles, nature of slope material, and water saturation are some of the factors controlling the mass wasting process.
Which of the following is the least susceptible to a landslide?
low angle slope, fractured rock, and dry conditions
high angle slope, fractured rock, and wet conditions
low angle slope, rock, and dry conditions
high angle slope, rock, and wet conditions
You were peeling hard-boiled eggs when you remembered that the eggs were used as an analogy to the layers of the Earth.
Between which parts of the egg can the Moho be found?
yolk and the albumen (white)
yolk and the shell
albumen (white) and the shell
the liquid and the solid albumen (white)
The diagram shows the intensity of earthquake that occurs on different parts of the Earth.
At which type of rock or soil profile where the houses are built experience the greatest earthquake?
coarse sediments
hard igneous rock
sedimentary rock
silt and mud
The diagram represents the partial inner structure of the Earth. Different layers are represented in respective numbers.
Which layer is most likely to contain solid nickel and iron?
1
2
3
4
The illustration shows a portion of the interior of the Earth. The location on the interface between layers is shown in Point A. Moreover, there is an inferred slow circulation of the mantle is shown by the arrow.
Describe the process shown by the arrow.
conduction
convection
radiation
insolation
Equal volumes of sediments as shown below are mixed and poured into a column of water.
To facilitate proper settling down into the column of water, what would be the best arrangement of the sediments from top to bottom?
pebbles – silt – coarse sand – fine sand
pebbles – coarse sand – fine sand – silt
coarse sand – fine sand – pebbles – silt
coarse sand – pebbles – silt – fine sand
The diagram illustrates the magnetic orientation of igneous rock on the right-side part of a seafloor along a mid-ocean ridge. Also, the age of the igneous rock and its distance from the ridge center is shown.
What evidence is manifested by the occurrence of high-heat flows at the center of the ridge?
destruction of oceanic crust
destruction of continental crust
existence of ancestral mountains
existence of rising mantle convection currents
Given the diagram, what is the correct sequence of events from oldest to youngest?
A-D-B-O-K-N-G-J-P-C-R
A-D-B-O-K-N-P-C-R-G-J
P-C-R-A-D-B-O-K-N-J-G
R-C-P-J-G-N-K-O-B-D-A
