Among the organisms in the options above, there is one organism that has received attention because of its potential as a raw material for biofuel and nutritional supplements. Which one is it?

Seasons occur due to the tilt of the Earth’s axis. The diagram below shows the position of the Earth relative to the Sun throughout the year. Positions A to D indicate the differences in seasons on Earth. Based on the diagram above, read the following questions and choose the correct answer from the table below.

(1) What is the season in the Northern Hemisphere when the Earth is in position ¢?

(2) At what position is the Earth when the Southern Hemisphere experiences the shortest day of the year?

In the human body, gases are transported by the blood through the circulatory system. Blood returning from the body to the lungs carries more carbon dioxide, which is exchanged for oxygen in the capillaries located in the alveoli. Oxygen is essential for producing energy so that the body can function properly. The following is an illustration of the human circulatory system. (1) Which blood vessels are rich in oxygen, and (2) which part of the heart pumps this blood throughout the body?

A typical lightning flash has a strength of around 300 million volts and 30,000 amperes. To protect buildings from lightning strikes, lightning rods are installed on the roof. It safely directs powerful electricity to the ground. Evan tested the conductivity of the following materials for use as lightning rods: aluminium, copper, titanium, and zinc. He placed each wire of the same length and thickness in an electrical circuit connected to an ammeter and a voltmeter. After measuring the current and voltage, he then calculated the electrical conductivity of each material. He repeated the experiment three times and wrote the results in the table below. Based on Evan's experimental results, which of the following options indicates the materials for the lightning rods in order from the best to the least effective?

Purple cabbage contains a water-soluble pigment called anthocyanin. In water, the solution is purplish blue, but changes color when mixed with an acid or a base. The pigment turns red in an acidic environment and yellowish green in an alkaline environment as illustrated below. Aaron experimented to test the acidity level of 3 different substances A, B, and C. He added each substance into test tubes containing purple cabbage juice and observed what happened to the juice. The following are his experimental results:

. When mixed with A, the color became yellowish green.

. When mixed with B, the color became pink.

. When mixed with C, the color did not change.

Which of the following options correctly identifies the most likely liquids he dropped into each

tube?

Aaron experimented to test the acidity level of 3 different substances A, B, and C. He added each substance into test tubes containing purple cabbage juice and observed what happened to the juice. The following are his experimental results:

. When mixed with A, the color became yellowish green.

. When mixed with B, the color became pink.

. When mixed with C, the color did not change.

Which of the following options only includes substances that belong to the same group as substance B?

Parasitic plants are plants that obtain nutrients from their host plants. Some are holoparasitic plants which steal all nutrients, including carbohydrates as the source of energy, from the host plants. Meanwhile, hemiparasitic plants extract only water and minerals from the host plants while producing their own carbohydrates. The table below shows the names of parasitic plants and their characteristics. Which of the following options correctly groups the holoparasitic and hemiparasitic plants?

Which of the following organisms show a symbiotic relationship as opposed to the relationship between the plants and their hosts mentioned above?

There are two springs of different lengths and stiffness. Spring X is 20 cm long, and spring Y is 10 cm long. When a 20 g weight is hung on spring X, it stretches to 26 cm. Next, spring Y is tied to spring X with the weight still hanging, then another weight is hung on spring Y, causing the springs to stretch as shown in figure 3. Assuming the extension of the springs is proportional to the weight suspended from the spring, and the weight of the springs is negligible, find the weight suspended from spring Y.