Question 1 of 20 Which of these young animals would have the greatest chance of survival?one of four maya birds in a nest being fed crushed insects by their mother one of two kittens being nursed by their mother one of many pawikan sea turtles about to swim into the ocean one fingerling in a school of tilapia fish hatched in a pond one kalabaw calf nursed by its mother

Question 2 of 20 The table below shows different types of leaves and the habitat in which they are usually found. Study the information given below to be able to answer the question that follows. Which type/s of leaf would be MOST effective in preventing the plant from drying up in conditions where water is limited?Leaf Type 1 Leaf Type 2 Leaf Type 3 Leaf Types 1 and 2 Leaf Types 1 and 3

Question 3 of 20 The roots of young corn plants are not able to cover much of the ground where they are planted, so sometimes soil erosion occurs. Which type of root would you expect this plant to have?

Question 4 of 20 For this item, refer to the following information.The atom was developed and was modeled in several steps. Each new discovery about thestructure of the atom leads to a new model. Four models of the atom are discussed below.Model A: An atom is a unit of matter that consists of a dense, central, positively charged nucleus surrounded by a negatively charged electron cloud. Model B: An atom is a sphere with positive charge containing embedded negative electrons. Model C: An atom is composed of a nucleus, where all the positive charges are at the center while the negatively charged particles can be found surrounding the nucleus in a fixed circular orbit. Model D: An atom is a very small indivisible particle. Model E: An atom is a combination of Models B and D.Match the descriptions above to the following figure:

A B C D E

Question 5 of 20 For this item, refer to the following information.The atom was developed and was modeled in several steps. Each new discovery about thestructure of the atom leads to a new model. Four models of the atom are discussed below.Model A: An atom is a unit of matter that consists of a dense, central, positively charged nucleus surrounded by a negatively charged electron cloud. Model B: An atom is a sphere with positive charge containing embedded negative electrons. Model C: An atom is composed of a nucleus, where all the positive charges are at the center while the negatively charged particles can be found surrounding the nucleus in a fixed circular orbit. Model D: An atom is a very small indivisible particle. Model E: An atom is a combination of Models B and D.Match the descriptions above to the following figure:

A B C D E

Question 6 of 20 Matter is defined to be anything that occupies space, has mass and possesses inertia. Which is NOT an example of matter?smoke clouds sunlight fiber glass mixture of atomic nuclei and electrons

Question 7 of 20 Carbon can be found in different forms, the most common are carbon graphite and diamond. The most recently discovered are the fullerines and nanotubes. Nanotubes can be found as one-layered or multi-layered. It is mainly a graphite plane whose ends are joined to form a cylinder. It has relatively high tensile strength and has conducting and semi-conducting properties. It is also as hard as diamond but elastically buckles rather than break when deformed. The most common type of fullerines is the buckminsterfullerene or the buckyball. It is a hollow spheroid which has a high resistance to high speed collision. When compressed to 70% of its original size, it is twice as hard as diamond.What is the best conclusion from this information?Carbon exists only in four forms: graphite, diamond, fullerines, and nanotubes. Diamond is not the hardest form of carbon, rather it is the compressed buckyball. Nanotubes and fullerines are synthetic carbon molecules that are used for the industry. Recent discovery of new forms of carbon, namely fullerines and nanotubes gave a new perspective on the properties and possible uses of carbon molecules. The uses of carbon is dependent on its structural nature.

Question 8 of 20 Plants, as producers, serve as the base of the ecological food pyramid, as shown in the figure.

This is becausethey are the most numerous living organisms on land and in water. they change solar energy into chemical energy for other living organisms. they supply all the needs of herbivores. they are eaten by all other organisms in the ecosystem. they produce oxygen that is needed by organisms to respire.

Question 9 of 20 Which of the following chains fit the food web in the diagram?

man --> chicken --> corn --> bacteria chicken --> beetle --> pechay worm --> guava corn --> pechay worm --> duck --> bacteria

Question 10 of 20 About 10 percent of energy is transferred from one feeding level to the next. How much energy is available to maya birds which feed on worms that eat corn leaves, if 12,000 kilocalories of energy is absorbed by corn?120,000 kilocalories 12,000 kilocalories 1,200 kilocalories 120 kilocalories 12 kilocalories

Question 11 of 20 Refer to the food web below:

Suppose a disease caused most of the rabbits in the ecosystem to die, predict what effect this would have on the hawk population. The hawk population will

increase. decrease. remain the same. be unaffected. either increase or decrease.

Question 12 of 20 You want to study the effect of pesticide overuse on the fertility of loam soil. Which of the following experimental set-ups can BEST be used to arrive at a valid conclusion about this effect?

Different types of plants are planted in three types of loam soil (A, B and C), where soil A has no pesticide, soil B has the normally prescribed amount of pesticide, and soil C has pesticide greater than the normally prescribed amount.

Similar plants are planted in two types of loam soil (A and B), where soil A has no pesticide, soil B has the normally prescribed amount of pesticide.

Similar plants are planted in two types of loam soil (A and B), where soil A has the normally prescribed amount of pesticide and soil B has pesticide greater than the normally prescribed amount. Similar plants are planted in the same type of loam soil with different pesticides A, B and C.

Similar plants are planted using one type of loam soil put in containers (A, B and C) where soil A has no pesticide, soil B has the normally prescribed amount of pesticide, and soil C has pesticide greater than the normally prescribed amount.

Question 13 of 20 Refer to the graph below.

What generalization can you draw from the graph?Boys and girls stop growing at the same age. Boys tend to be shorter than girls during the adolescent years. Girls tend to be shorter than boys during the late adolescent years. Boys and girls have the same growth pattern. Girls tend to be shorter than boys by age thirteen.

Question 14 of 20 Which of the following pair of force (each force represented by an arrow) produces the greatest change in the motion of the box across the floor?

Question 15 of 20 In humans, blood from the body enters the heart, is pumped to the lungs, goes back to the heart and is then pumped to the rest of the body. Blood passes through the lungs before it is distributed to the other organs so thatit can get oxygen from the lungs for distribution to the rest of the body. it can bring carbon dioxide from the rest of the body to the lungs to be exhaled. it can distribute digested nutrients to the rest of the body. Statements A and B are correct. Statements A, B, and C are correct.

Question 16 of 20 In the figure, which among the balls A to D possesses the highest amount of Potential Energy (Assume they have the same mass.)?

Ball A Ball B Ball C Ball D All the balls possess the same amount of PE.

Question 17 of 20 Heat always flows from a higher temperature to a lower temperature. It stops when the equilibrium temperature is reached. A metal which has a temperature of 20C is submerged into a cup of water, with a temperature of 80C. What do you predict will happen?The metal would be heated until it reaches a temperature of 80C. The water will cool down until it reaches a temperature of 20C. The water will cool down and the metal will become hot until both of them reach a temperature between 20C and 80C. Both of them will have the same temperature of 80C. Both of them will have the same temperature of 20C.

Question 18 of 20 In an experiment, it was found that pure water boils at a lower temperature compared to brine (salt solution), hard water or sugar solution. Brine has NaCl as its solute. Hard water contains dissolved salts of calcium and magnesium while sugar solution has sugar has its solute. From these observations, which of the following can be concluded?Solutions evaporate faster than pure water. The addition of solute to pure water (solvent) causes boiling point to elevate. Hard water, brine solution and sugar solution will have the same boiling points. The addition of solute to pure water will allow faster evaporation. Pure water does not contain any solute.

Question 19 of 20 The diagram below shows a circuit series.

Which of the following statements best describes the series circuit shown above?I and II only II and III only I and III only II and IV only IV only

Question 20 of 20 A student recorded measurements of the amount of carbon monoxide in the air at the same location each day for one week. The data are shown below.

The student concluded that the amount of carbon monoxide increases and decreases during the week. A source of error in this investigation is that the student failed toidentify the month. state the method of measurement. collect data at the same time each day. identify the day of the week. state his control.

DayTimeCarbon Monoxide (part per million)I3:10 p.m.0.38II9:10 a.m.0.20III6:00 a.m.0.95IV6:00 p.m.0.60V7:15 p.m.0.14VI7:20 p.m.1.15VII10:50 a.m.0.40

ANSWER KEY:1. one kalabaw calf nursed by its mother 2. Leaf Type 1 3.

4. B 5. C 6. sunlight 7. Recent discovery of new forms of carbon, namely fullerines and nanotubes gave a new perspective on the properties and possible uses of carbon molecules. 8. they change solar energy into chemical energy for other living organisms. 9. man --> chicken --> corn --> bacteria 10. 120 kilocalories 11. decrease. 12. Similar plants are planted using one type of loam soil put in containers (A, B and C) where soil A has no pesticide, soil B has the normally prescribed amount of pesticide, and soil C has pesticide greater than the normally prescribed amount. 13. Girls tend to be shorter than boys during the late adolescent years. 14.

15. it can get oxygen from the lungs for distribution to the rest of the body. 16. Ball D 17. The water will cool down and the metal will become hot until both of them reach a temperature between 20C and 80C. 18. The addition of solute to pure water (solvent) causes boiling point to elevate. 19. I and III only 20. collect data at the same time each day.