Camarines Sur province, dubbed as the wakeboarding capital of the Philippines is vulnerable to the threat of global warming. One of the measures to reduce this vulnerability is by minimizing the release of greenhouse gases into the atmosphere. Among the greenhouse gases enumerated below, which has the highest global warming potential?
Water hyacinth (Eichhornia cracipes) is a noxious weed that clogs sewage system, blocks navigation and interferes with the activities of people living near the river. Knowing the life cycle of the weed which multiplies by both asexual and sexual means, which of the following CANNOT be an effective way of controlling infestation of this weed?
Consider the following metals, steel and brass, forming a bimetallic strip. The figure on the left shows the two metals of the same length at room temperature. Based on the figure on the right, which of the two metals will easily expand at a higher temperature?
The numbered organs in the figure shown in the right are involved in human respiratory system. During breathing, the thoracic cavity enlarges and creates suction that moves air into the lungs. Write the number of the organ responsible for such biological process. Opposite the number, write the name of the organ.
Phenolphthalein is used as an acid or base indicator wherein contact or presence of acid will turn colorless and with base, it will turn into a pinkish violet color. The color transition of this indicator is shown below.
During thunderstorms, lightning usually strikes causing casualties to human life. If you were caught in the middle of a thunderstorm, what is the safest thing that you can do to avoid being hit by lightning?
Sit inside a car.
Swim underwater.
Stand in the middle of an open field.
Take shelter under a tree in the middle of a field.
Use a mobile phone to tell your friends where you are.
Some elements like carbon form a network of atoms. Carbon, for instance, forms two types of networks giving rise to two forms of element – diamond and graphite. What do you call the individual forms of an element that occur when atoms of the element combine in more than one way?
Water sample was collected at Lake Buhi in Camarines Sur. The microalgae present in the water were observed by the student using a compound light microscope. One of the microalgae was illustrated on the right. Identify the organism by using the dichotomous key given below:
| Step / Bước | Feature / Đặc điểm | Go to / Đi tới |
| --- | --- | --- |
| 1 | Filamentous / Dạng sợi | 2 |
| 1 | Unicellular or colony / Đơn bào hoặc tập đoàn | 3 |
| 2 | Unbranched / Không phân nhánh | Spirogyra |
| 2 | Branched / Phân nhánh | Chaetophora |
| 3 | One cell / Một tế bào | 4 |
| 3 | Colony / Tập đoàn | 6 |
| 4 | With flagella / Có roi | 5 |
| 4 | Without flagella / Không roi | Nitzchia |
| 5 | Elongated, one flagellum / Dài, một roi | Euglena |
| 5 | Oval, two flagella / Bầu dục, hai roi | Chlamydomonas |
| 6 | Spherical / Hình cầu | Volvox |
| 6 | Not spherical / Không hình cầu | 7 |
| 7 | 2 or 4 cells with corner spines / 2 hoặc 4 tế bào có gai ở góc | Scenedesmus |
| 7 | Round flat plate / Đĩa tròn phẳng | Pediastrum |
Pithecophaga jefferyi, commonly known as the Monkey Eating Eagle is a very big mountain eagle found only in the Philippines. This bird weighs 14 pounds, stands 3 feet tall and with a wingspan of 6.5 feet. All conservation efforts are being done today to save this very much endangered species. Which of the following factors must have been the least cause of the severe decline of its number?
A heating curve is a graph of heat added versus temperature. The figure below shows the heating curve for ice at -25°C to steam at 125°C. Line segment AB represents the heating of ice from -25°C to 0°C and line segment BC represents the melting of ice. Addition of heat increases the temperature of the water up to 100°C represented by line segment CD. What does line segment DE and EF represents.
From the food pyramid, a healthy and nutritious meal should comprise carbohydrates (largest amount), fruits and vegetables (seccond largest), milk and meat groups (third largest), fats and oils (smallest amount). From the food items given below, construct a healthy, nutritious, free from additives and preservative meal for lunch.
If you happen to live or visit the Philippines, you should not miss the beautiful sunset at Manila Bay or the beaches in the countryside. Proofs of these are the pictures shown below:
Considering the above pictures, answer the following questions:
A. Why is the sky blue?
B. Why the sun looks yellow in color?
C. Explain the reddish yellow color of the Sun on the horizon.
D. Will you have a reddish color of the Sun in Manila City than in the beaches? Explain your answer.
Two nearly alike leafy twigs were cut at the same time from the same branch of the tree. In the laboratory, two test tubes were filled with equal level of water and a small quantity of cedar wood oil was then poured over the water so that none of it may be lost by evaporation.
All the leaves were stripped from one of the branches and the branches are then put into the test tubes as seen in the figure at the right.
Which of the two set-ups have water diminishes at a much greater rate? Explain your answer.
In the Philippines, Butanding, a whale shark, is commonly found in the marine waters of Donsol, Sorsogon while Tamaraw, a water buffalo, is endemic in the mountains of Mindoro. Although they have different habitats, both are considered as vertebrate animals. Give four common characteristics shared by the two animals.
An experiment is carried out by a taikonaut on the surface of the Moon. A coin and a feather are dropped at the same instant from the same height. Which among the statement is correct?
The coin falls faster than the feather, but both take a longer time than if they were falling from the same height on Earth.
The coin falls faster than the feather, but both take a shorter time than if they were falling from the same height on Earth.
They fall together, taking a longer time than the coin would in falling from the same height on Earth.
They fall together, taking shorter time than the coin would in falling from the same height on Earth.
Two species with the same food requirements remain in the same community. Which graph would most likely describe the relative population of the two species over time?
