Latihan Soal IPA Kelas 9 Semester 1

Explanation
The brain is not an excretory organ in humans. It is responsible for controlling and coordinating various bodily functions, but it does not play a role in the excretion of waste materials from the body. The liver, lungs, and kidneys, on the other hand, are all involved in the process of excretion. The liver helps in the breakdown and elimination of toxins, the lungs eliminate carbon dioxide through respiration, and the kidneys filter waste products from the blood to produce urine.

Explanation
The correct answer is "Kulit Ginjal (korteks)". The explanation is that the question is asking about the different parts of the human skin, and the options provided are "Kulit Ginjal (korteks)" (Kidney skin or cortex), "Kulit ari (epidermis)" (Epidermis or outer layer of the skin), "Kulit jangat (dermis)" (Dermis or inner layer of the skin), and "Jaringan ikat bawah kulit" (Subcutaneous tissue). The correct answer is "Kulit Ginjal (korteks)" because it is not a part of the human skin.

Explanation
The correct answer is Epididimis. The epididymis is a part of the male reproductive system. It is a coiled tube located on the back of each testicle and serves as a storage and maturation site for sperm. It plays a crucial role in the transportation and development of sperm before they are ejaculated. The other options, such as Rahim (uterus), Ovarium (ovaries), and Vulva (external female genitalia), are not relevant to the male reproductive system.

Explanation
Oogenesis is the correct answer because it refers to the process of egg cell formation in females. During oogenesis, the ovum (egg cell) is produced in the ovaries through a series of cell divisions and maturation processes. This process is essential for sexual reproduction in females and is distinct from menstruation, which refers to the shedding of the uterine lining. Spermatogenesis, on the other hand, is the process of sperm cell formation in males, and the term "ovarium" simply refers to the female reproductive organ where oogenesis takes place.

Explanation
The correct answer is Komodo,kadal. Komodo dragons are considered living fossils because they have remained relatively unchanged for millions of years. They are descendants of ancient reptiles and have adapted to survive in their environment for a long time. Kadal, which means lizard in Indonesian, is another term for the Komodo dragon. Therefore, both Komodo and kadal are examples of living fossils.

Explanation
When object A has a positive charge and object B has a negative charge, they will experience an attractive force when brought close to each other. This is because opposite charges attract each other according to the law of electrostatics. Therefore, the correct answer is Tarik-Menarik, which means attraction.

Explanation
An elektroskop is a device used to detect the presence and magnitude of electric charge. It consists of a metal rod or plate connected to a conducting wire and a pair of leaves made of thin metal foil. When a charged object is brought near the elektroskop, the leaves will either repel or attract each other, indicating the presence and type of charge. This makes the elektroskop a useful tool for detecting electric charge.

Explanation
The correct answer is P = V x I. This formula represents the relationship between power (P), voltage (V), and current (I) in an electrical circuit. Power is equal to the product of voltage and current, indicating that the amount of power consumed or produced in a circuit depends on the voltage and current flowing through it.

Explanation
Kipas angin mengubah energi listrik menjadi energi gerak. Ketika listrik dialirkan ke kipas angin, motor di dalamnya menghasilkan putaran yang menggerakkan kipas. Energi listrik yang disalurkan ke motor tersebut kemudian diubah menjadi energi gerak pada kipas angin, sehingga kipas dapat berputar dan menghasilkan angin.

Explanation
The correct answer is "Liver." The question is asking for an example of a disease or condition related to the liver. The liver is an important organ in the body that performs various functions such as detoxification, metabolism, and production of bile. Liver diseases can range from mild conditions such as fatty liver to more serious conditions such as cirrhosis or hepatitis. Therefore, "Liver" is the correct answer as it is a specific example of a disease or condition that can affect the liver.