1. The lymphatic system is a network of vessels and organs that plays a vital role in:

A. Transporting oxygen and nutrients to cells
B. Carrying waste products away from tissues
C. Regulating body temperature
D. Producing red blood cells

Correct answer: B

Rationale: The correct answer is B: Carrying waste products away from tissues. The lymphatic system is responsible for collecting excess fluid and waste products from tissues and returning them to the bloodstream for removal. This helps maintain fluid balance in the body and supports immune function by transporting white blood cells to fight infections. Options A, C, and D do not accurately describe the function of the lymphatic system. Transporting oxygen and nutrients to cells is primarily the role of the circulatory system, while regulating body temperature is controlled by the nervous system and producing red blood cells occurs in the bone marrow.

2. Which type of waves are capable of interference and diffraction?

A. Longitudinal waves only
B. Transverse waves only
C. Electromagnetic waves only
D. Both longitudinal and transverse waves

Correct answer: d

Rationale: Both longitudinal and transverse waves can exhibit interference and diffraction phenomena.

3. Which hormone, produced by the ovaries, is responsible for the development of the uterine lining during the menstrual cycle and supports early pregnancy?

A. Estrogen
B. Progesterone
C. Testosterone
D. Prolactin

Correct answer: B

Rationale: The correct answer is B: Progesterone. Progesterone is a hormone produced by the ovaries that plays a crucial role in the menstrual cycle and early pregnancy. During the menstrual cycle, progesterone helps to prepare the uterine lining for a potential pregnancy by making it thick and vascularized. If fertilization occurs, progesterone continues to support the early stages of pregnancy by maintaining the uterine lining and preventing menstruation. Estrogen also plays a role in the menstrual cycle by stimulating the growth of the uterine lining, but progesterone is primarily responsible for maintaining the uterine environment suitable for implantation and supporting early pregnancy. Testosterone is a male sex hormone, while prolactin is a hormone involved in milk production after childbirth.

4. The protective fluid surrounding the brain and spinal cord is called:

A. Blood
B. Cerebrospinal fluid
C. Plasma
D. Myelin

Correct answer: B

Rationale: The correct answer is B: Cerebrospinal fluid. Cerebrospinal fluid is a clear, colorless liquid that surrounds the brain and spinal cord, providing cushioning and protection against physical impact. It also helps to maintain a stable environment for the central nervous system by regulating pressure and removing waste products. Blood (option A) is not the fluid that directly surrounds the brain and spinal cord. Plasma (option C) is the liquid component of blood and is not specific to the central nervous system. Myelin (option D) is a fatty substance that forms a protective sheath around nerve fibers but is not the fluid surrounding the brain and spinal cord.

5. What is the relationship between the speed of a wave, its frequency, and wavelength in a given medium?

A. Speed = Frequency Ã— Wavelength
B. Speed = Frequency Ã· Wavelength
C. Speed = Frequency + Wavelength
D. Speed = Frequency - Wavelength

Correct answer: a

Rationale: In a given medium, the speed of a wave equals the product of its frequency and wavelength.

6. Which sentence uses parentheses correctly?

A. The suspect was seen driving a red car (a witness reported).
B. The movie (released in 2022) received critical acclaim.
C. The restaurant offers a variety of dishes (including vegetarian options).
D. All participants (must register by Friday) will receive a free gift.

Correct answer: B

Rationale: Parentheses are used for non-essential information that clarifies or adds detail. Option (a) is unnecessary and disrupts the flow of the sentence.