Question 1

Your mother planted monggo seeds separately in cans. She used a different amount of fertilizer in germinating the seeds. The volume of each liquid is the same, and exposure to light was moderate. She found out that the monggo seeds germinated at different time. What is the independent variable in the set up?

Accepted Answer

A. the amount of sunlight

Answer

B. the amount of fertilizer

Answer

C. the different amount of liquids

Answer

D. the time of germination of the seeds

Question 2

You observe that the iron grills in your gate become rusty after the rain. You wonder why they become rusty. Which step in the scientific method is involved?

Accepted Answer

D. identifying the problem.

Answer

C. formulating hypothesis

Answer

B. making conclusions

Answer

A. gathering data

Question 3

For questions 3-4. You were tasked by your teacher to investigate howfast crushed salt dissolves in cold and hot water.

Observing the fair testing, what will be your controlled variables?

I. method of stirring

II. time each solution is stirred

III. amount of water in each cup

IV. time the solid is added to water

V. amount of crushed salt in each cup

Accepted Answer

D. I, II, III, IV, and V.

Answer

A. I, II, and III

Answer

B. I, II, III, and IV

Answer

C. I, III, IV, and V

Question 4

For questions 3-4. You were tasked by your teacher to investigate how fast crushed salt dissolves in cold and hot water.

Which variable is being measured in your investigation?

Accepted Answer

A. the temperature of water.

Answer

B. the amount of crushed salt

Answer

C. the time the crushed salt will completelydissolve in hot water

Answer

D. the time the crushed salt will completely dissolve in hot and cold water

Question 5

Sodium chloride (NaCl), a combination of sodium(Na) and chlorine (Cl), is dissolved in water. After several days, the water evaporated, leaving the salt in the container. How will you classify the salt?

Accepted Answer

A. compound.

Answer

C.  metal

Answer

D.  mixture

Answer

B.  element

Question 6

Which of the following statements is NOT TRUE?

Accepted Answer

C. Compounds are made up of one kind of element.

Answer

B. Compounds are more complex than elements

Answer

D. Components of water can be separated by electrolysis

Answer

A. Sodium chloride is made up of two elements

Question 7

Which of the following statements best describes the similarity between elements and compounds?

Accepted Answer

A. They are both pure substances.

Answer

B. They are both listed in the periodic table

Answer

D. They are both made up of different kinds of atoms

Answer

C. They can be both broken down by physical means

Question 8

You are curious if sulfur can conduct electricity. You tested it by dissolving the sulfur in the water and immersing the prongs of an electric conductor. The device did not produce any sound. How will you classify sulfur?

A. compound

B. metal

C. metalloid

D. non-metal

A. compound

B. metal

C. metalloid

D. non-metal

Accepted Answer

D. non - metal.

Answer

C. metaloid

Answer

A. compound

Answer

B.  metal

Question 9

Which of the following statements is TRUE about elements and compounds?

Accepted Answer

D. Compounds are more complex than elements.

Answer

C. Elements are more complex than compounds

Answer

A. They have the same composition

Answer

B. They can be broken down by physical means

Question 10

Humans and animals absorb oxygen (O₂)from the air they breathe in and release carbon dioxide (CO₂).Carbon dioxide (CO₂) is a/an________________.

Accepted Answer

D. compound made of carbon and oxygen atoms.

Answer

C. element made of carbon and oxygen atoms

Answer

A. mixture of carbon and oxygen atoms

Answer

B. solution made of carbon and oxygen atoms

Question 11

Your sister has an unopened box of a 40-meterfoil labeled 100% made of aluminum. Aluminum is a pure substance. She takes just a thumb size piece of aluminum foil. Which of the following statements is TRUE about the piece of aluminum foil your sister took compared with the rest left in the box?

Accepted Answer

C. Its mass is different but the melting point is the same.

Answer

A. Its mass and melting point are different

Answer

A. Its mass and melting point are different

Answer

B. Its mass and melting point are the same

Question 12

Compounds are different from mixtures because________________.

Accepted Answer

D. compounds are held together by chemical bonds.

Answer

A. mixtures are held together by chemical bonds

Answer

B. mixtures cannot be separated by physical means

Answer

C. compounds can be separated by physical means

Question 13

You were tasked by your teacher to check if the liquid sample you have is a substance or a mixture. Which of these tests will you use?

I. color comparison III. boiling point test

II. taste comparison IV. melting pointtest

Accepted Answer

C. I, III, and IV only

Answer

D. I, II, III, and only

Answer

B. I, II, and IV only

Answer

A. I and III only

Question 14

A liquid has the following properties: one phase, colorless, and varying boiling points. Which of the following BEST describes the liquid?

Accepted Answer

C.  mixture

Answer

D. substance

Answer

A. compound

Answer

B.  element

Question 15

1. Given the following data, which of the solid samples are probably the SAME substances?

Sample Color Mass ( g ) Melting Point (⁰C) Density(g/mL)

Solid 1 Gray 16 120 3.2

Solid 2 Brown 18 115 3.2

Solid 3 Black 17 130 2.5

Accepted Answer

A. Solids 1 and 2.

Answer

D. Solids 2 and 4

Answer

B. Solids 2 and 3

Answer

C. Solids 1 and 4

Question 16

When all parts of a mixture have a uniform appearance and the same properties, it is homogeneous. Solutions are homogeneous mixtures. Which of the following is NOT homogeneous?

Accepted Answer

C. pebbles and water

Answer

B. sugar and water

Answer

D. vinegar and water

Answer

A. salt and water

Question 17

Your mother asked you to heat a liquid in a pan. You forgot to immediately switch off the stove, and all of the liquid had evaporated. However, you saw that some solid materials had accumulated on the pan's surface. What conclusion can you draw from your observation?

Accepted Answer

C. The liquid was a mixture of dissolved solid materials.

Answer

D. The liquid material was a pure substance because it evaporated.

Answer

B. The liquid was composed of a single material.

Answer

A. The liquid was a pure substance.

Question 18

Water boils at 100 ^oC and pure ethanol at 78 ^oC. Which of the following statements concerning water and ethanol is/are correct?

I. Water and ethanol are both pure substances.

II. Water and ethanol can be boiled at either100 ^oC or 78 ^oC.

III. Water and ethanol have specific temperaturesat which they would start to boil.

IV. Water and ethanol can be identified according to the temperature at which they boil.

Accepted Answer

D. I, III, and IV

Answer

A.    I only

Answer

C. I, II, and III

Answer

B.    II only

Question 19

In a saturated solution, which of these actions will cause more solute to dissolve?

Accepted Answer

B. by heating the solution.

Answer

A. by cooling the solution

Answer

C. by increasing the solute

Answer

D. by decreasing the solute

Question 20

A solution can still dissolve more solute. What type of solution is it?

Accepted Answer

B. saturated.

Answer

C. supersaturated

Answer

D. unsaturated

Answer

A. concentrated

Question 21

Your sister prepared juice for your visitors. You observed that some juice particles were not dissolved. How will you describe the juice prepared by your sister in terms of saturation?

Accepted Answer

C. supersaturated

Answer

D. unsaturated

Answer

B. saturated

Answer

A. concentrated

Question 22

Using the data below, in which step is thesolution described as saturated?

STEP TOTAL AMOUNT OF SUGAR ADDED OBSERVATIONS AFTER STIRRING

1 6 grams salt completely dissolved

2 12 grams salt completely dissolved

3 18 grams salt completely dissolved

4 24 grams Some sugar is seen at the bottom of the container.

Accepted Answer

C.  step  3.

Answer

D.  step 4

Answer

C.  step 1

Answer

A.  step 2

Question 23

Which of the following is less concentrated?

Accepted Answer

A. 10 grams of sugar and 50 grams of water

Answer

B. 15grams of sugar and 50 grams of water

Answer

C. 20 grams of sugar and 50 grams of water

Answer

D. 25 grams of sugar and 50 grams of water

Question 24

In your Science 7 class, you prepared a solution by mixing 50 g of salt in 100 g of water.

What are the concentrations of the solute and solvent in percent by mass?

Accepted Answer

B. solute: 33.33% solvent: 66.67%

Answer

D. solute: 50.00% solvent: 150%

Answer

A. solute: 0.33% solvent: 0.67%

Answer

C. solute: 0.33% solvent: 100%

Question 25

You prepared a solution containing 9% of sodium chloride (NaCl). How will you describe your solution?

Accepted Answer

A. The solution contains 9% of sodium chloride(NaCl) and 91% of water.

Answer

C. The solution contains 90 grams of sodium chloride (NaCl) and 100 grams of water.

Answer

B. The solution contains 90 % of sodium chloride(NaCl) and 10 % of water.

Answer

D. The solution contains 0.9 grams of sodiumchloride (NaCl) and 0.91 grams of water.

Question 26

Rene needs to raise the stage of the microscope to focus the specimen he is studying using the LPO. Which part should he manipulate?

Accepted Answer

D. coarse adjustment knob

Answer

A.  Mirror

Answer

B. low power objective

Answer

C. high power objective

Question 27

After the sample specimen is placed over the slide, a cover slip is put on top of the sample.

How does cover slip work?

Accepted Answer

D. prevents the sample specimen from tumbling offt he slide.

Answer

A. makes the sample bigger

Answer

B. supports the specimen from below

Answer

C. provides an aesthetic effect on the sample slide

Question 28

The circle below represents the field of view of the microscope. The square represents the plant cell being viewed and the star represents the center, how will you move the slide?

Accepted Answer

C. towards you

Answer

D. away from you

Answer

B. to the right

Answer

A. to the left

Question 29

Which of the following is the correct order for the five levels of organization in the human body, from the most to least complex?

Accepted Answer

C. organism→ organ system → organ → tissue → cell

Answer

A. cell → tissue → organ → organ system → organism

Answer

D. organism → organ system → tissue → organ →cell

Answer

B. cell → organ → tissue → organ system→ organism

Question 30

The organ systems of plants consist of the root and shoot systems. What is the function of the root system?

Accepted Answer

A. absorb nutrients.

Answer

C. bear flowers and fruits

Answer

D. perform photosynthesis

Answer

B. distribute nutrients

Question 31

Which of the following organs DOES NOT match the system?

Accepted Answer

B. Bones : Endocrine

Answer

A. Kidney : Urinary

Answer

D. Gametes: Reproduction

Answer

C. Lungs : Respiration

Question 32

An animal cell is viewed using a 15X eyepiece and a 40X HPO. How much will the cell be magnified?

Accepted Answer

D.  600X

Answer

C.  55X

Answer

A.  15X

Answer

B.  40X

Question 33

You are to transfer the microscope to the next room. Which parts should you be holding in carrying it properly?

Accepted Answer

A. arm and base

Answer

D. drawtube and base

Answer

C. eyepiece and base

Answer

B. arm and stage

Question 34

The plants need abiotic components for existence. The following are examples of abiotic components EXCEPT

Accepted Answer

B. decomposers.

Answer

A.   water

Answer

D. carbon dioxide

Answer

C. radiant energy

Question 35

What kind of symbiotic relationship is exhibited when a bee hops from one flower to another?

Accepted Answer

B. mutualism

Answer

C. parasitism

Answer

A. commensalism

Answer

D. predation

Question 36

Which of the following correctly describes the relationship between an orchid and a tree?

Accepted Answer

A. Both organisms are benefited.

Answer

B. The orchid is harmed while the tree is benefited

Answer

C. The orchid is benefited while the tree is harmed

Answer

D. The orchid is benefited while the tree is unaffected

Question 37

Chlorophyll helps plants to produce food through the process of photosynthesis. Which of the following organelles contains chlorophyll?

Accepted Answer

A. chloroplast

Answer

D. plasma membrane

Answer

C.    nucleus

Answer

B. cytoplasm

Question 38

Why are bacteria and fungi important in the environment?

Accepted Answer

B. They act as decomposers.

Answer

D. They help beautify the surroundings.

Answer

C. They are sources of energy.

Answer

A. They can cause diseases.

Question 39

Which of the following statements differentiates asexual reproduction from sexual reproduction?

Accepted Answer

C. Asexual reproduction does not require gametes,while sexual reproduction requires the union of gametes.

Answer

D. Asexual reproduction produces offspring which isdifferent from the parent, while sexual reproduction produces offspringidentical to the parent.

Answer

A. Asexual reproduction requires gametes, whilesexual reproduction requires body parts.

Answer

B. Asexual reproduction undergoes fertilization,while sexual reproduction undergoes budding.

Question 40

Why is it that only a small amount of energy stored in food is transferred to the next organism in a food chain?

Accepted Answer

D. Most energy was lost because it was converted to heat energy.

Answer

C. Most of the energy was used for life processes.

Answer

B. Many organisms compete for the same food.

Answer

A. There are more producers than consumers.

Question 41

Which of the following statements is TRUE?

Accepted Answer

B. Groups of cells working together are called tissues.

Answer

A. Groups of organs working together are called cells.

Answer

D. Groups of tissues working together are called organ systems

Answer

C. Groups of organs working together are called organisms.

Question 42

The table below shows a comparison between three kinds of cells. Which two cells could possibly have come from the same organism?

Part of the cell Cell 1 Cell 2 Cell 3

Nucleus / / /

Chloroplast / X /

Cell Membrane / / /

Centriole X / X

Accepted Answer

B. 1 and 3

Answer

A. 1 and 2

Answer

D. 1, 2, and 3

Answer

C.    2 and 3

Question 43

A farmer grew only one type of corn. All the corn plants died from the same disease. What can be said in this corn plant?

Accepted Answer

A. The corn plants were genetically identical.

Answer

D. The corn plants were genetically different from one another

Answer

B. Only a few plants were resistant to the disease.

Answer

C. All the corn plants were resistant to the disease.

Question 44

What must be placed in an aquarium to maintain a steady supply of oxygen?

Accepted Answer

A.  plant

Answer

D.  water

Answer

C.  turtle

Answer

B.  soil

Question 45

Which of the following activities DOES NOT cause a negative change in the environment?

Accepted Answer

C. recycling

Answer

A. cutting trees

Answer

B. muro -,ami

Answer

C. smoke belching

Question 46

All of the following organs are parts of the circulatory system EXCEPT _________.

Accepted Answer

C.    stomach

Answer

D.  veins

Answer

A.   blood

Answer

B.  heart

Question 47

Which of the following statements differentiates organs from tissues?

Accepted Answer

C. Tissues make up organs, while cells make up tissues.

Answer

B. Organs and tissues make up an organ system.

Answer

A. Organs and tissues are made up of cells.

Answer

D. Tissues make up organs, while cells make uporgan system.

Question 48

Cancer starts from cells that grow uncontrollably fast. They destroy tissues and organs. What does this say about the effects of diseased cells on the higher levels of organization in an organism?

Accepted Answer

D. Diseased cells damage the higher levels of organization they make up such as tissues, organs, organ systems, and eventually the whole organism.

Answer

C. Diseased cells involve only certain kinds of cells and does not affect any other kind of cell.

Answer

B. Diseased cells affect only the next higher level of organization they make up.

Answer

A. Diseased cells do not affect the other parts of an organism.

Question 49

Spores, when carried by the wind, can grow, or reproduce into a new organism called spore formation. Which of the following is reproduced by spore formation?

Accepted Answer

C.  molds

Answer

D.  potato

Answer

B.  ginger

Answer

a.  garlic

Question 50

In binary fission, how does the daughter cells’ DNA compare to the parent cells’ DNA?

Accepted Answer

A. It is identical.

Answer

D. It is only half of the amount of DNA found inthe parent.

Answer

B. It is the combination of the parent’s DNA.

Answer

C. It has the same similarities and some differences.

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